EP Series _10-80KVA_ Service Manual

1

CONTENTS EP Series UPS operating principle ..................................................................................... 3 1 Product introduction .......................................................................................................... 4

1.1 Introduction.............................................................................................................. 4 1.2 Control panel ........................................................................................................... 4

2 System electrical connection diagram............................................................................... 5 2.1 Electrical connection schematic diagram................................................................. 5 2.2 System block diagram ............................................................................................. 6

3 EP series UPS specifications............................................................................................ 7 4 EP series UPS internal structure..................................................................................... 10

4.1 Inside picture for 10~40KVA .................................................................................. 10 4.2 Inside picture for 60-80KVA ................................................................................... 13

5 EP series UPS principle introduction .............................................................................. 16 5.1 Rectifier module..................................................................................................... 16 5.2 Inverter module...................................................................................................... 17

6 PCB interface signals...................................................................................................... 18 6.1 Rectifier driver board (CS12772E)......................................................................... 18 6.2 Rectifier control board............................................................................................ 21 6.3 Inverter driver board (CS12083F) .......................................................................... 25 6.4 Inverter control board (CS12190C)........................................................................ 27 6.5 Auxiliary power board (NF12200C)........................................................................ 31 6.6 SCR bypass board (NF12345C) ............................................................................ 34 6.7 Interface board ...................................................................................................... 36 6.8 System control board (OCSA2196A01) ................................................................. 40 6.9 Power configuration board (NF12223B) ................................................................ 46 6.10 Output sampling board (NF12310C).................................................................... 48 6.11 Inverter current sampling board (NF12494B)....................................................... 51

7 Parameter regualtion potentiometer................................................................................ 53 8 Indicator signification of PCB status................................................................................ 53

1. Indicator signification of system board status............................................................. 53 2. Indicator signification of invert control board status.................................................... 53 3. Indicator signification of parallel board status............................................................. 54

9 UPS parameter and function setting command code (press key 35 on display panel) 54 10 PCB difference between EP series different power UPS .............................................. 55

1. Rectifier driver board (CS12772E) ............................................................................. 55 2. Inverter driver board (CS12083F) .............................................................................. 55 3. Inverter current sampling board (CS12494C)............................................................. 55 4. Power configuration board (CS12223B)..................................................................... 55

EP Series UPS maintenance.............................................................................................. 57 1 Introduction ..................................................................................................................... 59

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2 Fault analysis and maintenance...................................................................................... 60 3 Failure code and inquiry.................................................................................................. 64

TABLE OF MEMORIZED INTERNAL CODE / TABELLA CODICI INTERNI ........ 64 4 Parallel maintenance ...................................................................................................... 69 5 Instructions of EP Series singe unit into parallel units:.................................................... 70 Start up ................................................................................................................................. 79

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EP Series UPS Operating Principle

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1 Product introduction 1.1 Introduction

EP series on-line intelligent UPS adopts double-conversion design to eliminate various interference of the power system. UPS outputs a pure sine wave power with stabilizing voltage, filtering out noise, low distortion and being not interferenced by the fluctuation of power system. And it has strong load ability, good load compatibility, wide range of input voltage and frequency, excellent generator compatibility, non-switching time of output and so on, extremely satisfy the requirement of various application environments; Perfect protection system improves the stability and reliability of system operation; Friendly LCD design makes human-machine communication easier; Use a RS232 between UPS and PC to get work history, monitor the parameters, start up / shut down automatically, realize unattended and remote monitoring function (by SNMP-Adapter). It applies to advanced network system. Power range: 10KVA-80KVA Operation mode: intelligent on-line (3 phases in 3 phases out) Application range: work stations, large-scale network servers, computer room and large

data center

1.2 Control panel IN utility input indicator (Green: lighting indicates normal utility, blinking indicates

abnormal utility) BY bypass output indicator (Yellow: lighting indicates normal bypass output, blinking

indicates abnormal bypass output) OUT inverter output indicator (Green: lighting indicates normal inverter output, blinking

indicates output is overload) BATT battery discharging indicator (Orange: lighting indicates the battery is discharging,

blinking indicates battery is not connected)

LCD Display

Button

5

2 System electrical connection diagram 2.1 Electrical connection schematic diagram

6

2.2 System block diagram

Figure 2-1 EP Series UPS electrical principle diagram

Shown on Fig 2.1, close SWBY and SWOUT, UPS checks the phase sequence. If it is correct, the bypass contactor will close immediately. Bypass powers the load (orange line) and system PCB operating power begins to set up; Then close SWIN, the rectifier begins to work, when the BUS voltage is up to 360VDC, the inverter will start up. UPS enters the self-check, if the utility is in the range of synchronous tracking and there is no internal fault, the output contactor will close and bypass contactor will open, and UPS switches to inverter mode; The battery pack is directly connected to DC BUS, once close battery switch, UPS begins to charge the battery (red line); Green line in Fig 2.1 represents maintenance bypass. When the UPS is abnormal and needs maintenance, close SWMB, the utility powers the load directly. open SWBY, SWIN, SWOUT, and discharge the voltage of capacitance to zero. Then you can change the board and carry out maintenance.

As the orange line shown on Fig 2.1, when one of the following situations happens, UPS will switch to bypass mode:

1) Utility is on, close SWBY and SWOUT, SWIN is off; 2) Close SWIN, UPS is in soft start process; 3) Switch to bypass mode through operating command on the control panel; 4) Overload; 5) Inverter fault; 6) UPS overtemperature protection.

AC DC

DCAC

SWIN

BYP SWBY

TLBY

SWOUT

TLBATT

FBATT

TLI

SWMB

7

3 EP series UPS specifications

System THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Power factor range

100 % load 0.5~0.8 inductive load 100~80%load 0.8~1.0 inductive load

80% load 1.0~0.8 capacitive load 70% load 0.5~0.8 capacitive load 80%load computer load

Efficiency% Full load 90 90 91 91 92 92 92 Half load 88 88 89 89 90 91 91

Loss power with nominal load and battery charge kW / kcal / B.T.U.

0.89 800 4367

1.33 1100 4400

1.58 14005560

2.37 20007940

2.78 2400 9500

4.17 3600

14000

5.57 4800

19000Flow rate allowing (for room installation) (*)[mc/h]

496 682 868 1240 1488 2232 2976

Max leakage current [mA] 100 MTBF: 200,000 hours Remote signal three contact signals (battery low, battery discharging,

bypass/fault); output 12Vdc 80mA Computer interface RS232/C Operating temperature 0 40 C Maximum relative hunmidity 95 % (without condensate) Maximum operating altitude 1000m at rated power An (-1% An for each 100m) max 4000mCooling forced ventilation (fan speed function of the load) Acoustic noise, as measured at 1m from front of equipment (depend on load and temperature) dBA

48 ~ 54 53 ~ 60 53 ~ 62

Degree of protection IP20

Rectifier input (Standard UPS) THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Rated voltage 380V 3 phases Phase 3 Voltage range 20 % Rated frequency 50 / 60 Hz auto learning Frequency range 45 ~ 65 (1+10%) Soft start 0 - 100% 10 Sec Max input current [A] 18 28 37 55 72 108 130 Current distortion 30 % Power factor 0.8

Rectifier input (UPS with harmonic reduction filter) THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Rated voltage 380V 3 phases Phase 3

8

Voltage range 20 % Rated frequency 50 / 60 Hz auto learning Frequency range 45 ~ 65 Soft start 0 ~ 100% 10 Sec Max input current [A] 16 24 33 50 65 97 117 Total harmonic distortion and power factor, vary with the output load (nominal input Voltage) :

load 100% distortion 8% p.f. 0.9 50% 12% 0.94 30% 25% 0.96 0% 30% 1

Total harmonic distortion and power factor, vary with the input voltage (load 100%) :

Vinput 100% distortion 8% p.f. 0.9 86% 5% 0.94 114% 11% 0.84

Rectifier output THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Maintenance voltage (20C) Battery type 1 and 2 : V =435Vdc (2.26 x el.)

type 3 : V =424Vdc (2.2 x el.) type 0 : default values are equal to type 1 and 2. Value adjustable V =400~460Vdc

Charge voltage Battery type 1 and 2 : V(% recharge

9

Voltage phase shift, with unbalancedload (degree)

2

Distortion with non-linear load (crest factor 3:1)

8 %

Voltage stability at steady state 1 % Voltage stability at transient state 5 % into 10 ms Rated frequency The same of the input Frequency stability With synchronization 0.05 % Without synchronization 2 % (settable 1 % on the control panel) overload 110/125/150% rated current 300 sec / 10sec / 1 sec Short circuit current for 0.1 sec 2 In Inverter efficiency % load 100% 91% 91% 92% 92% 93% 93% 93%

Bypass THREE-PHASE OUTPUT Rated power [KVA] 10 15 20 30 40 60 80 Rated current (A) 14 22 29 43 58 87 115 Rated voltage 380V Number of phases 3 + N Input voltage range 15 % (settable 10 % , 15 % on the control panel) Rated frequency 50 / 60 Hz (auto learning) Input frequency range 2 % (settable 5 % on the control panel) Inverter/bypass transfer time (overload) 0 ms Inverter/bypass transfer time (inverter fault)

1 ms

Overload capacity %In 1h 1.5 1.6 1.5 1.6 1.5 1.3 1.2 10min 1.7 1.8 1.7 1.7 1.7 1.4 1.3 1min 2.4 2.5 2.4 2.5 2.4 2 1.8 1s~20ms 10 10 10 10 10 8 8 10ms 14 15 14 15 14 12 11 Standard Backfeed protection Options Harmonic reduction filter

Insulation transformer on bypass line (external cabinet) SNMP card for monitoring

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4 EP series UPS internal structure

4.1 Inside picture for 10~40KVA

Figure 4-1 Epower series UPS internal top view

System Control Board

Aux Power Board

Interface Board

SCR Bypass Board Configuration Board

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Figure 4.2 EP series UPS internal left view

Figure 4.3 EP series UPS internal right view

Phase 2 INV Driver Board

INV Control Board

Output Transformer Input Inductance


Output Filter Capacitance


Rectifier Driver Board

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Figure 4.4 EP series UPS internal front view (1)

Figure 4.5 EP series UPS internal front view (2)

Rectifier Control Board

DC CAP.

DC FUSE

IGBT Module SCR Rectifier Module

Output Vol Sampling Board

BATT FUSE

Bypass Breaker

Battery Contactor

INV Output Contactor Bypass Output Contactor

SWIN SWBY SWOUT SWMB

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4.2 Inside picture for 60-80KVA

Figure 4.6 EP series UPS internal front view

Phase 3 INV driver Phase 1 INV driver

Phase 2 INV driver

DC CAP. DC FUSE

SCR rectifier module

AC CAP.

TLI TLBY TLBATT

SWB SWIN SWBY SWOUT SWMB

Bypass fuse

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Figure 4.7 EP series UPS internal top view

Figure 4.8 EP series UPS internal right view

System Control Board Interface Board

Aux Power Board SCR Bypass Board

Inverter Control Board

Rectifier Control Board

Rectifier Driver Board

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Figure 4.9 EP series UPS internal back view

Output Transformer Input Inductance

Fans

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5 EP series UPS principle introduction

5.1 Rectifier module

Fig 5-1 shows schematic diagram of three phases rectifier circuit. Phase sequence of three phases input is RST, and triggering signal of rectifier circuit is also designed in accordance with the sequence. The valves are paired triggered, and the triggered sequence is shown as Fig 5-2:

Wave form of rectifier output voltage without filter is shown as Fig 5-3, Area of rectifying

wave form is equal to the voltage area contained by two corresponding rectifier valves.

Figure 5-3 EP series UPS three phases rectifier principle and wave form diagram

The working process is as follows:

When the utility UR crosses zero point at t0 and rises, if send a trigger pulse to Thyristor 1

at t1 behind the intersection point UR=UT, the voltage between US is the largest at this time, so

the procedure is designed to open relevant Thyristor 5, to form a loop. It can be seen from the

figure, UR continues to rise, US also rises. When the rising UR arrives at peak, it is just on t2

when the rising US intersects the falling UT. If 5 is common rectifier diode, will automatically

convert to 1 and 6 paired-on status. But here is Thyristor, If relevant Thyristor is not triggered

Figure 5-1 EP series UPS rectifier circuit

1 1 2 2 3 3 1 5 6 6 4 4 5 5

Figure 5-2 EP series UPS rectifier SCR triggered sequence

Uc Ub Ua

C

1

4 5 6

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to open, 1 and 5 will continue on till t4 (UR=US). As the arc dotted line shown in Fig 5-3. So the

trigger sequence is open Thyristor 6 on t3, make the rectifier output the maximum. This status

will last to t4, At this time UT arrives at the negative peak, it also the intersection point of UR

and US (UR=US). After this point, Thyristor 2 is triggered, to form 2 and 6 paired-on, repeat 1

and 6 paired-on status. Then open relevent valve on US and UT Arm according to the same

sequence. Make the output be DC wave in the absence of capacitance filter as shadow wave

form shown in Fig 5-3. The rectifier wave is regular and symmetrical, so three phases input

current is also symmetrical and identical.

5.2 Inverter module

Fig 5-4 shows schematic diagram of EP series UPS three phases full bridge inverter

circuit. The conversion purpose is just opposite to three phases full bridge rectifier circuit, to

realize DC/AC conversion by controlling Q1-Q6 on by turns. Then output pure sine wave

voltage through boost transformer and LC filter.

Figure 5-4 EP series UPS inverter principle diagram

Q1 Q2 Q3

Q4 Q5 Q6

T1

+BUS

-BUS

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6 PCB interface signals

6.1 Rectifier driver board (CS12772E)

PICTURE OF CS12772E

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CS12772E PCB Function of each pin and signal instruction

CS12772EJ1 (input voltage/current detect, TO J1 of rectifier control board)

Pin No. Descriptions Pin1 VF1APhase1 input voltage sampling signal Pin2 VF1BPhase1 input voltage sampling signal Pin3 VF2APhase2 input voltage sampling signal Pin4 VF2BPhase2 input voltage sampling signal Pin5 VF3APhase3 input voltage sampling signal Pin6 VF3BPhase3 input voltage sampling signal Pin7 IF1A Phase1 input current sampling signal Pin8 IF1B Phase1 input current sampling signal Pin9 IF2A Phase2 input current sampling signal Pin10 IF2B Phase2 input current sampling signal Pin11 IF3A Phase3 input current sampling signal Pin12 IF3B Phase3 input current sampling signal CS12772EJ2 (rectifier driver pulse generator, To J2 of rectifier control board)

Pin No. Descriptions Pin1 +24VDC

Pin2 Phase R driver (SCR1)


Pin4 Phase S driver (SCR2)


Pin6 Phase T driver (SCR3)


Pin8 connect to Pin1 of J3

Pin9

Pin10 short Pin9 and Pin10, connect to Pin2 of J3

CS12772EJ3 (rectifier temperature detection)

Pin No. Descriptions Pin1 probe of temperature control (typical

value:11.5K)

20

Pin2 probe of temperature control

CS12772EJ4 (rectifier voltage and battery charging/discharging current detection, To J3 of rectifier control board)

Pin No. Descriptions Pin1 Urec-

Pin2 Urec+

Pin3 IBatt+ (connect to current sampling resistance RB)

Pin4 IBatt- (connect to current sampling resistance RB)

Pin5 Cable (short with Pin4)

Pin6 GND

CS12772EJ5 (three phases input voltage sampling point) Pin No. Descriptions Pin1 Phase 1 (rated value:230AC)

Pin2 Phase 2

Pin3 Phase 3

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6.2 Rectifier control board

PICTURE OF CS12742E

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CS12742E PCB Function of each pin and signal instruction CS12742EJ1 (input voltage/current detection signal, TO J1 of rectifier driver board)

Pin No. Descriptions Pin1 VF1APhase 1 input voltage sampling signal Pin2 VF1BPhase 1 input voltage sampling signal Pin3 VF2APhase 2 input voltage sampling signal Pin4 VF2BPhase 2 input voltage sampling signal Pin5 VF3APhase 3 input voltage sampling signal Pin6 VF3BPhase 3 input voltage sampling signal Pin7 IF1A Phase 1 input current sampling signal Pin8 IF1B Phase 1 input current sampling signal Pin9 IF2A Phase 2 input current sampling signal Pin10 IF2B Phase 2 input current sampling signal Pin11 IF3A Phase 3 input current sampling signal Pin12 IF3B Phase 3 input current sampling signal CS12742EJ2 (rectifier SCR driver pulse generating circuit, To J2 of rectifier dirver board)

Pin No. Descriptions Pin1 +24VDC







Pin8 Thermal 2

Pin9 GND

Pin10 Cable1

CS12742EJ3 (TO J4 of rectifier drive board)

Pin No. Descriptions Pin1 Urec-

Pin2 Urec+

23

Pin3 TAB+

Pin4 TAB-

Pin5 Cable

Pin6 GND

CS12742EJ4 (Null) Pin No. Descriptions Pin1 SETIB

Pin2 SETV

Pin3 VC

Pin4 VP

Pin5 VN

Pin6 GND

Pin7 0V (+24VDC negative port)

Pin8 +24VDC

CS12742EJ5 (operating power, control signal and feedback signal of rectifier, TO J4 of system control board)

Pin No. Descriptions Pin1 IR3 (Phase 3 current detection signal of rectifier input)

Pin2 VAVG3 (Phase 3 input average voltage)

Pin3 IR2 (Phase 2 current detection signal of rectifier input)


Pin5 IR1 (Phase 1 current detection signal of rectifier input )


Pin7 synchrotrans signal

Pin8 charging current setting

Pin9

Pin10 charging voltage setting

Pin11 rectifier start up enable signal (from system control board)

Pin12 battery discharging current sampling signal

Pin13 battery charging current sampling signal

Pin14 battery voltage sampling signal

Pin15 overtemperature alarm signal

Pin16 GND

24

Pin17 +24VDC

Pin18 +24VDC

Pin19 +12VDC

Pin20 +12VDC

Pin21 0V (+24VDC negative port)

Pin22 0V (+24VDC)

Pin23 GND

Pin24 GND

Pin25 GND

Pin26 -12VDC

Pin27 -12VDC

Pin28 null

Pin29 null

Pin30 connect to one NTC of transformer through J6, detect the temperature of

transformer

Pin31

Pin32 rectifier disabling signal

Pin33

Pin34 GND

CS12742EJ6 (access point of transformer temperature detect signal) Pin No. Descriptions Pin1 null

Pin2 null

Pin3 connect to one NTC of transformer, detect the

temperature of transformer

Pin4 GND

25

6.3 Inverter driver board (CS12083F)

PICTURE OF CS12083F

CS12083F PCB Function of each pin and signal instruction CS12083F J1 (inverter driver signal, TO J1 or J2 or J3 of inverter control board)

Pin No. Descriptions Pin1 probe of temperature control (PTC)

Pin2 GND

Pin3 driver power

Pin4 driver power

Pin5 upper arm driver signal feedback optocoupler biasing power(collector)

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Pin6 upper arm driver signal feedback optocoupler biasing power(emitter)

Pin7 lower arm driver signal feedback optocoupler biasing power(collector)

Pin8 lower arm driver signal feedback optocoupler biasing power(emitter)

Pin9

Pin10 short Pin9 and Pin10

Pin11 PWMUP

Pin12 PWMUP

Pin13 null

Pin14 null

Pin15 PWMDOWN

Pin16 PWMDOWN

CS12083FJ2 (inverter radiator temperature detection) Pin No. Descriptions Pin1 probe of temperature control (PTC)

Pin2 GND

CS12083FJ3 (driver terminal, TO IGBT) Pin No. Descriptions Pin1 upper arm driver (G1:10~40KVA)

Pin2 E1

Pin3 upper arm driver (G1:60~80KVA)

Pin4 vacant

Pin5 vacant

Pin6 lower arm driver (G2:10~40KVA)

Pin7 E2

Pin8 lower arm driver (G2:60~80KVA)

27

6.4 Inverter control board (CS12190C)

PICTURE OF CS12190C

28

CS12190C PCB Function of each pin and signal instruction CS12190C J1, J2, J3 (R, S, T driver terminal)

Pin No. Descriptions Pin1 probe of temperature control (PTC) Pin2 GNDA Pin3 driver power Pin4 driver power Pin5 upper arm driver signal feedback optocoupler biasing power

(collector) Pin6 Pin7 short Pin6 and Pin7

Pin8 lower arm driver signal feedback optocoupler biasing power(emitter)

Pin9 Pin10 short Pin9 and Pin10, Link signal (connect to GND)

Pin11 PWMUP Pin12 PWMUP Pin13 null Pin14 null Pin15 PWMDOWN Pin16 PWMDOWN

CS12190CJ4 (TO CS12494C: inverter current sampling board)

Pin No. Descriptions Pin1 R phase inverter current sampling signal (Ipeak)

Pin2 S phase inverter current sampling signal (Ipeak)

Pin3 T phase inverter current sampling signal (Ipeak)

Pin4 Neutral line current

Pin5 +12VDC

Pin6 -12VDC

Pin7 Link (connection detection signal)

Pin8 Link

29

CS12190CJ5 (TO NF12310C: J1 of output sampling board) Pin No. Descriptions Pin1 VR (Phase R inverter output voltage

detection) Pin2 VN

Pin3 null

Pin4 VS

Pin5 VN

Pin6 null

Pin7 VT

Pin8 VN

Pin9 null

Pin10 Link

Pin11 Link

Pin12 Link NGND CS12190CJ6 (BUS voltage detection)

Pin No. Descriptions Pin1 Vbatt- (-BUS voltage detection signal)

Pin2 Vbatt+ (+BUS voltage detection signal)

Pin3 LinkLowNormal HighFailure Pin4 Link

CS12190C: J7 (operating power and control signal of inverter, TO J3 of system control board)

Pin No. Descriptions Pin1 +13.5VDC

Pin2 +13.5VDC loop (0V reference)

Pin3 +13.5VDC

Pin4 +13.5VDC loop

Pin5 +13.5VDC

Pin6 +13.5VDC loop

Pin7 +13.5VDC

Pin8 +13.5VDC loop

Pin9 +12VDC

Pin10 -12VDC

30

Pin11 +12VDC

Pin12 -12VDC

Pin13 null

Pin14 -12VDC loop

Pin15 inverter synchronous signal

Pin16 12VDC common port

Pin17 clock signal


Pin19 data signal

Pin20 common port

Pin21 SCR-DC-INV-FAIL

Pin22 inverter gating port (high level on)

Pin23 inverter OK signal (feedback to system board)

Pin24 synchronization OK signal (feedback to system board)

Pin25 NTC1 (orignal design has the NTC, vacant in fact)

Pin26 NTC2

31

6.5 Auxiliary power board (NF12200C)

PICTURE OF CS12200C

32

NF12200C PCB Function of each pin and signal instruction

NF12200CJ1 (two power inputs, one main one auxiliary) Pin No. Descriptions Pin1 output voltage - live wire (220VAC, from Phase R of inverter contactor

output)

Pin2 null

Pin3 bypass input voltage - live wire (220VAC, from Phase R of SWBY output)

Pin4 output voltage neutral wire

Pin5 null

Pin6 bypass input voltage - neutral wire

NF12200CJ2 (operating power of complete machine, To J2 of system control board) Pin No. Descriptions Pin1 +24VDC (PFC: rectifier operating power)

Pin2 +24VDCPFC Pin3 +24VDC loop

Pin4 +24VDC loop

rated output power

15W

Pin5 +12VDCPFC Pin6 +12VDCPFC

3W

Pin7 12VDC loop

Pin8 12VDC loop

Pin9 -12VDCPFC Pin10 -12VDCPFC

3W

Pin11 +13.5VDC (VPOT: inverter operation power)

Pin12 +13.5VDCVPOT Pin13 +13.5VDCVPOT Pin14 +13.5VDCVPOT Pin15 +13.5VDCVPOTloop Pin16 +13.5VDCVPOTloop Pin17 +13.5VDCVPOTloop Pin18 +13.5VDCVPOTloop

15W

Pin19 +12VDC (INV: inverter operating power) 4W

33

Pin20 +12VDCINV Pin21 12VDC loop

Pin22 12VDC loop

Pin23 -12VDCINV 0.3W Pin24 +12VDC (SYS: system operating power)

Pin25 +12VDCSYS 5W

Pin26 +12VDC loop

Pin27 +12VDC loop

Pin28 +12VDC (SYSPOT: system operating power)

Pin29 +12VDCSYSPOT 3W

Pin30 -12VDCSYS 150mW Pin31/32/33 null

Pin34 auxiliary power PCB operating forbidden signal

34

6.6 SCR bypass board (NF12345C)

PICTURE OF NF12345C

35


NF12345CJ1 (bypass SCR driver pulse source port, TO J3 of interface board) Pin No. Descriptions Pin1 GNDA

Pin2 SCR driver pulse (the third quadrant)

Pin3 SCR driver pulse (the first quadrant)

Pin4 SCR current detection signal

NF12345CJ2 (bypass input/output voltage detect, TO J6 of interface board) Pin No. Descriptions Pin1 null Pin2 neutral wire of fan power Pin3 neutral wire of three phases output Pin4 Phase T output sampling signal Pin5 Phase S output sampling signal Pin6 Phase R output sampling signal Pin7 bypass Phase T input sampling signal Pin8 bypass Phase S input sampling signal Pin9 bypass Phase R input sampling signal Pin10 TLI, TLBATT winding power (from Phase 1 of output, convert to 220VDC by

AC/DC) Pin11 TLBY winding power (from Phase 1 of bypass, convert to 220VDC by AC/DC)Pin12 Phase R output to tripper winding of SWBY

NF12345CJ3 (TO J1 of auxiliary power board) Pin No. Descriptions Pin1 inverter output voltage - live wire (220VAC, from inverter contactor output

Phase R) Pin2 null Pin3 bypass input voltage - live wire (220VAC, from SWBY output Phase R) Pin4 inverter output voltage neutral wire Pin5 null Pin6 bypass input voltage neutral wire

NF12345CJ4 (fan power, TO 220AC) Pin1/2/3/4/5/6 live wirePin7/8/9/10/11/12 neutral wire

36

6.7 Interface board

PICTURE OF NF12197B

NF12197B PCB Function of each pin and signal instruction

NF12197BJ1 (operating power and control signal of dry contact, TO J9 of system control board)

Pin No. Descriptions Pin1 +12VDC (optocoupler biasing power source)

Pin2 +12VDC (negative port of optocoupler biasing power source)

Pin3 close inverter command (dry contact remote control signal)

Pin4 shut down UPS command (dry contact remote control signal)

37

NF12197BJ2 (contactor control signal and bypass SCR driver pulse, TO J8 of system control board) Pin No. Descriptions

Pin1 control RL4 to make TLBATT winding power on. Low: normal High: abnormal

Pin2 control RL5 to make inverter output contactor TLI winding power on, turn offTLBY at the same time. Low: inverter High: bypass Pin3 SWBY tripper action signal (provided by system control board) Pin4 Pin5 Pin6 bypass SCR driver pulse string

Pin7 battery contactor TLBATT auxiliary contact signal Pin8 bypass contactor TLBY auxiliary contact signal Pin9 inverter contactor TLI auxiliary contact signal Pin10 SWOUT auxiliary contact Pin11 SWMB auxiliary contact Pin12 COM. (common port) Pin13 GND Pin14 Phase R inverter output current sampling signal (Ipeak) Pin15 Phase S inverter output current sampling signal (Ipeak) Pin16 Phase T inverter output current sampling signal (Ipeak) Pin17 +12VDC Pin18 +12VDC Pin19 +12VDC (inverter part) Pin20 common port Pin21 common port Pin22 bypass SCR current sampling signal Pin23 null Pin24 bypass Phase R input voltage sampling (positive half-wave, voltage value

20VAC) Pin25 bypass Phase R input voltage sampling (negative half-wave, voltage value

20VAC) Pin26 bypass Phase S input voltage sampling (positive half-wave, voltage value

20VAC) Pin27 bypass Phase S input voltage sampling (negative half-wave, voltage value

20VAC) Pin28 bypass Phase T input voltage sampling (positive half-wave, voltage value

20VAC) Pin29 bypass Phase T input voltage sampling (negative half-wave, voltage value

20VAC) Pin30 Phase R output voltage sampling (positive half-wave, voltage value 20VAC) Pin31 Phase R output voltage sampling (negative half-wave, voltage value 20VAC)

38

Pin32 Phase S output voltage sampling (positive half-wave, voltage value 20VAC) Pin33 Phase S output voltage sampling (negative half-wave, voltage value 20VAC) Pin34 Phase T output voltage sampling (positive half-wave, voltage value 20VAC) Pin35 Phase T output voltage sampling (negative half-wave, voltage value 20VAC) Pin36 null Pin37 null Pin38 battery discharging alarm signal (dry contact alarm) Pin39 battery discharging off alarm signal (dry contact alarm) Pin40 bypass abnormal alarm signal (dry contact alarm)

NF12197BJ3 (TO J1 of bypass SCR board) Pin No. Descriptions Pin1 GND

Pin2

Pin3 SCR driver pulse string

Pin4 SCR current detection signal (TASCR)

NF12197BJ4 Instruction: connect to remote control output port, controlled by RL1, RL2 and RL3, output dry contact alarm signal to realize remote control function. Detailed interface desription refers to instruction NF12197BJ5 (TO auxiliary contacts of the three contactors) Pin No. Descriptions Pin1 bypass contactor auxiliary contact (AuxTLBY)

Pin2 battery contactor auxiliary contact (AuxBATT)

Pin3 COM. (common port)

Pin4 inverter contactor auxiliary contact (AuxTLI)

NF12197BJ6 (TO J2 of bypass SCR board) Pin No. Descriptions Pin1 null Pin2 neutral wire of fan power Pin3 three phases output neutral wire

39

Pin4 Phase T output sampling signal Pin5 Phase S output sampling signal Pin6 Phase T output sampling signal Pin7 bypass Phase T input sampling signal Pin8 bypass Phase S input sampling signal Pin9 bypass Phase R input sampling signal Pin10 TLI, TLBATT winding power (from output of Phase 1, convert to 220VDC by

AC/DC) Pin11 TLBY winding power (from Phase 1 of bypass, convert to 220VDC by AC/DC)Pin12 Phase R output to tripper winding of SWBY

NF12197BJ7 (connect to contactor winding and inverter output current detection loop) Pin No. Descriptions Pin1 NSYS Pin2 COMTA3 Pin3 anode of bypass contactor winding power Pin4 anode of battery contactor winding power Pin5 anode of inverter output contactor winding power (+220VDC) Pin6 cathode of battery and inverter output contactor winding

operating power(sharing) Pin7 cathode of byapss contactor winding operating power Pin8 COMTA2 Pin9 TAOUT3 (Phase T output current, AC) Pin10 TAOUT2 (Phase S current) Pin11 TAOUT1 (Phase R current) Pin12 COMTA1

NF12197BJ8 (connect to auxiliary contactor of input/output switch and maintenance bypass switch)

Pin No. Descriptions Pin1 connect to NC of SWMB

Pin2 COM.

Pin3 connect to NO of SWOUT

Pin4 null

Pin5 null

Pin6 null

Pin7 N

Pin8 L (SWBY tripper winding operating power, controlled by RL6, 220AC)

40

6.8 System control board (OCSA2196A01)

PICTURE OF OCSA2196A01

OCSA2196A01 PCB Function of each pin and signal instruction OCSA2196A01J1 (TO LCD and LED indicator display panel) Pin No. Descriptions Pin1 +12VDC (provide operating power to LCD and buzzer )

Pin2 TASTCOL2

Pin3 LCDINV (inverter output indicator lightening signal)

Pin4 LCDBY (bypass output indicator lightening signal)

Pin5 RWLCD (contrast regulation)

Pin6 D0LCD

41

Pin7 D2LCD

Pin8 TASTCOL1

Pin9 LEDLINE (utility input indicator signal)

Pin10 LEDBATT (battery indicator signal)

Pin11 buzzer

Pin12 -5VDC (LCD CMOS chip power)

Pin13 VSSGND Pin14 +12VDC (provide operating power to LCD and buzzer )

Pin15 +5VDC (VDD: LCD CMOS chip power)

Pin16 LCD connection is OK

Pin17 RSLCD (reset signal)

Pin18 ENLCD (gating first, high level on)

Pin19 D1LCD

Pin20 D3LCD

Pin21 TASTCOL2

Pin22 LCDINV (inverter output indicator signal)

Pin23 bypass indicator signal

Pin24 null

Pin25 null

Pin26 VSSGND

OCSA2196A01J2 (TO J2 of auxiliary power board) Pin No. Descriptions Pin1 +24VDC (PFC: rectifier operating power)

Pin2 +24VDCPFC Pin3 +24VDC common port

Pin4 +24VDC common port

rated output power

15W

Pin5 +12VDCPFC Pin6 +12VDCPFC

3W



Pin9 -12VDCPFC Pin10 -12VDCPFC

3W

Pin11 +13.5VDC (VPOT: inverter operation power)

Pin12 +13.5VDCVPOT 15W

42

Pin13 +13.5VDCVPOT Pin14 +13.5VDCVPOT Pin15 +13.5VDC (VPOT)common port

Pin16 +13.5VDC (VPOT)common port



Pin19 +12VDC (INV: inverter operating power)

Pin20 +12VDCINV 4W



Pin23 -12VDCINV 0.3W Pin24 +12VDC (SYS: system operating power)

Pin25 +12VDCSYS 5W

Pin26 +12VDC common port

Pin27 common port

Pin28 +12VDC (SYSPOT: system operating power)

Pin29 +12VDCSYSPOT 3W

Pin30 -12VDCSYS 150mW Pin31/32/33 null

Pin34 auxiliary power PCB operating forbid signal

OCSA2196A01J3 (TO J7 of inverter control board) Pin No. Descriptions Pin1 +13.5VDC

Pin2 common port

Pin3 +13.5VDC

Pin4 common port

Pin5 +13.5VDC

Pin6 common port

Pin7 +13.5VDC

Pin8 common port

Pin9 +12VDC

Pin10 -12VDC

Pin11 +12VDC

Pin12 -12VDC

43

Pin13 null

Pin14 GND

Pin15 inverter synchronous signal


Pin17 clock signal


Pin19 data signal

Pin20 GND

Pin21 SCR-DC-INV-FAIL

Pin22 inverter gating port (high level on)

Pin23 inverter OK signal (feedback to system board)

Pin24 synchronization OK signal (feedback to system board)

Pin25 NTC1 (orignal design has the NTC, vacant in fact)

Pin26 NTC2

OCSA2196A01J4 (TO J5 of rectifier control board) Pin No. Descriptions Pin1 IR3 (Phase 3 of rectifier input current detection signal)

Pin2 VAVG3 (Phase 3 input average voltage )

Pin3 IR2 (Phase 2 of rectifier input current detection signal)

Pin4 VAVG2 (Phase 2 input average voltage )

Pin5 IR1 (Phase 1 of rectifier input current detection signal)

Pin6 VAVG1 (Phase1 input average voltage )

Pin7 synchrotrans signal

Pin8 charging current setting

Pin9

Pin10 charging voltage setting

Pin11 rectifier starp up enable signal (from system control board)

Pin12 battery discharging current sampling signal

Pin13 battery charging current sampling signal

Pin14 battery voltage sampling signal

Pin15 overtemperature alarm signal

Pin16 GND

Pin17 +24VDC

Pin18 +24VDC

44

Pin19 +12VDC

Pin20 +12VDC

Pin21 +24VDC negative port

Pin22 +24VDC negative port

Pin23 GND

Pin24 GND

Pin25 GND

Pin26 -12VDC

Pin27 -12VDC

Pin28 null

Pin29 null

Pin30 connect to one NTC of transformer through J6, detect the

temperature of transformer

Pin31

Pin32 rectifier disabling signal

Pin33

Pin34 GND

OCSA2196A01J5 (TO J1 of power configuration board) Pin No. Descriptions Pin1 GND (analogy GND)

Pin2 TAOUT2 (Phase S output current detection signal)

Pin3 TAOUT3 (Phase T output current detection signal)

Pin4 \Low (digital signal) Pin5 \60Hz (when input and output is 60Hz, short block on JP2-2 of

configuration board is connected) Pin6 spare (idle)

Pin7 spare (idle)

Pin8 spare (idle)

Pin9 GND (analogy GND)

Pin10 TAOUT1 (Phase R output current detection signal)

Pin11 TADC

Pin12 TAAC

Pin13 spare (idle)

Pin14 GND (digital GND)

Pin15 GND (digital GND)

45

OCSA2196A01J6 (idle)

OCSA2196A01J7 (RS232 interface) omit OCSA2196A01J8 (TO J2 of interface board) Pin No. Descriptions

Pin1 control RL4 to make TLBATT winding power on Low: normal High: abnormal

Pin2 control RL5 to make inverter output contactor TLI winding power on, turn off TLBY at the same time. Low: invert High: bypass Pin3 SWBY tripper action signal (provided by system board) Pin4 Pin5 Pin6 bypass SCR driver pulse string

Pin7 battery contactor TLBATT auxiliary contact Pin8 bypass contactor TLBY auxiliary contact Pin9 inverter contactor TLI auxiliary contact

Pin10 SWOUT auxiliary contact Pin11 SWMB auxiliary contact Pin12 COM. (common port) Pin13 signal GND (GND) Pin14 Phase R inverter output current sampling signal (Ipeak) Pin15 Phase S inverter output current sampling signal (Ipeak) Pin16 Phase T inverter output current sampling signal (Ipeak) Pin17 +12VDC Pin18 +12VDC Pin19 +12VDC (inverter part) Pin20 common port Pin21 common port Pin22 bypass SCR current sampling signal Pin23 null Pin24 bypass Phase R input voltage sampling (positive half-wave voltage value

20VAC) Pin25 bypass Phase R input voltage sampling (negative half-wave voltage value

20VAC) Pin26 bypass Phase S input voltage sampling (positive half-wave voltage value

20VAC) Pin27 bypass Phase S input voltage sampling (negative half-wave voltage value

46

20VAC) Pin28 bypass Phase T input voltage sampling (positive half-wave voltage value

20VAC) Pin29 bypass Phase T input voltage sampling (negative half-wave voltage value

20VAC) Pin30 Phase R output voltage sampling (positive half-wave, voltage value 20VAC) Pin31 Phase R output voltage sampling (negative half-wave, voltage value 20VAC) Pin32 Phase S output voltage sampling (positive half-wave, voltage value 20VAC) Pin33 Phase S output voltage sampling (negative half-wave, voltage value 20VAC) Pin34 Phase T output voltage sampling (positive half-wave, voltage value 20VAC) Pin35 Phase T output voltage sampling (negative half-wave, voltage value 20VAC) Pin36 null Pin37 null Pin38 battery discharging alarm signal (dry contact alarm) Pin39 battery discharging off alarm signal (dry contact alarm) Pin40 bypass abnormal alarm signal (dry contact alarm)

6.9 Power configuration board (NF12223B)

PICTURE OF NF12223B

NF12223B PCB Function of each pin and signal instruction (omit)

47

Diagram of NF12223B

48

6.10 Output sampling board (NF12310C)

PICTURE OF NF12310C

49

Diagram of NF12310C

50


NF12310CJ1 (inverter output voltage sampling, TO J5 of inverter control board) Pin No. Descriptions Pin1 VR (Phase R inverter output voltage sampling) Pin2 VN Pin3 null Pin4 VS Pin5 VN Pin6 null Pin7 VT Pin8 VN Pin9 null Pin10 Link (interface connection OK or not signal) Pin11 Link Pin12 Link NGND

NF12310CJ2 (output current feedback, TO J7 of interface board) Pin No. Descriptions Pin1 TAOUT1 (Phase R current) Pin2 TAOUT2 (Phase S current) Pin3 COM1 Pin4 TAOUT3 (Phase T output current, AC) Pin5 COM3 Pin6 COM2

NF12310CJ3 (inverter output voltage feedback, output to inverter control board from J1) Pin No. Descriptions Pin1 VR (Phase R inverter output voltage feedback signal) Pin3 VS Pin5 VT Pin2/Pin4/Pin6 /Pin7/Pin8 null

Pin9 neutral wire Pin10/Pin11 Link (detection signal), two pins is shorted

51

6.11 Inverter current sampling board (NF12494B)

PICTURE OF NF12494B

Diagram OF NF12494B

52

NF12494B PCB Function of each pin and signal instruction

NF12494B J1 (inverter current detection signal) Pin No. Descriptions Pin1 High current (high current signal) Pin2 Reture (loop common port) Pin3 Link (interface connection signal) Pin4 Low current (low current signal) Pin5 Return Pin6 Link

53

7 Parameter regualtion potentiometer

PCB name Potentiometer

No. Function test point

system

control board R17

regulate base electrical

level of U4

reference value: 4.6VDC

anode of D69GNDA

system

control board R125 regulate contrast of display

inverter

control board R89


level of U26

reference value: 4.6VDC

anode of D17GNDA

rectifier

control board R157


level: 4.4VDC

anode of C86GNDA (J4-6)

8 Indicator signification of PCB status

1. Indicator signification of system board status

LED No. lightening

(green) off blinking (green) remark

L0 rectifier operating rectifier forbid

L1 inverter operating inverter forbid

L2 bypass output inverter output

L3 system abnormal system normal

2. Indicator signification of invert control board status

LED No. lightening

(green) off blinking (green) remark

L0 inverter OK inverter abnormal

L1 synchronization out of

synchronization

L2 inverter forbid inverter

operating

54

3. Indicator signification of parallel board status

LED No. lightening

(green) off

slow blinking (green)

fast blinking (green)

L0 master slave

L1 bypass status communication

normal

L2 bypass operating inverter operating

9 UPS parameter and function setting command code (press key 35 on display panel)

Code Function description remark 436215 parameter setting password

436213 shield or non-shield inverter-to-bypass command (47263) display

436555 bypass permitted / forbidden functionconversion code

323232 battery self-check permitted /forbidden function conversion code

when self-check is forbidden, LCD top left corner of page 1 displays O=02

263574 clear history records the panel diaplays Memory Changed 525252 UPS type conversion Riello brand

467123 parallel units share battery pack or not function conversion code when share battery pack, LCD displays RTXX, B

55

10 PCB difference between EP series different power UPS

Entire series is in common use board: system control board, inverter control board, rectifier control board, auxiliary power board,

bypass SCR board, interface board, output sampling board, parallel board

Entire series is not in common use board and the difference between them

1. Rectifier driver board (CS12772E)

Power RA1~RA3 RB R25~R26 R27~R28

10K 120 /0.5W NC 356K /1/4W 356K /1/4W

15K 82 /0.5W NC 356K /1/4W 356K /1/4W

20K 68 /0.5W 22 /0.5W 356K /1/4W 356K /1/4W

30K 47 /0.5W 22 /0.5W 356K /1/4W 356K /1/4W

40K 33 /0.5W 8.2 /0.5W 356K /1/4W 356K /1/4W

60K 22 /0.5W 8.2 /0.5W 356K /1/4W 356K /1/4W

80K 18 /0.5W 8.2 /0.5W 356K /1/4W 356K /1/4W

2. Inverter driver board (CS12083F)

Power R61R67 R65R68 R62R66 R86R88 C44 20-40K 6.8 /0.5W 10 /0.5W 12 /0.25W NC NC

60-80K 4.7 /1W 2.7 /1W 12 /0.25W1 / 5W

(noninductive)

0.015u/1600V (noninductive)

3. Inverter current sampling board (CS12494C)

Power R1,R2 R4 R3

10K 22 /0.5W 68 /0.5W 33 /0.5W

20-30K 12 /0.5W 15 /0.5W 82 /0.5W

40K 12 /0.5W 15 /0.5W 33 /0.5W

60-80K 3.3 /0.5W 10 /0.5W 10 /0.5W

4. Power configuration board (CS12223B)

Power R3R5R7 R4R6R8 =40K 47 /0.5W 22 /0.5W

Model Configurationpower configuration board

56

JP1 JP2 JP3 JP4 RT10 RT15 JP4-2 RT20 JP1-1 JP3-1JP3-2 JP4-1 RT30 JP1-1 JP3-1JP3-2 JP4-1JP4-2 RT40 JP1-1 JP2-1 JP3-1JP3-2 RT60 JP1-1 JP2-1 JP3-1JP3-2 JP4-2 RT80 JP1-1 JP2-1 JP3-1JP3-2 JP4-1

(JP1/JP2/JP3/JP4 have 4 ground points, configure UPS power model according to short combination of jumper terminal)

57

EP Series UPS maintenance

58

Important hint 1. Before carry out maintenance to UPS, please read this manual carefully. 2. Considering the security, please dont carry out the test that is not mentioned in this manual to UPS.

Warning (only for maintenance service engineers) 1. Before maintenance, please confirm the utility is normal or not; 2. When UPS is operating, there is high voltage endangering personal safety inside UPS, please dont touch inner wiring and components casually. 3. Before unpacking the cover of connecting terminal, because there is AC utility, the inner still exists high voltage though the battery switch is off. 4. After powering off the UPS, the inner electrolysis capacitance still exists high direct voltage, please wait at least 10 minutes and then carry out the next operation.

Attentions 1. Before maintanance, check the appearance of the machine carefully, to confirm whether it

has broken down, is waterlogged and exists other man-made failures, or suffers other failures

caused by natural disasters, or it is just caused by poor electric performance.

2. Before maintenance, inquire the customer carefully about the used time, load, using

environment, electric power situation of the area and details of the broken machine. If the

customer reports as jump-spark, smoking, air switch tripping when start up the UPS, should

not start up to check it again, to avoid enlarging the range of trouble.

3. Communicate with the customer about the checking result after starting up and the

damage conditions of the component, to confirm the damage duty of the machine.

4. Check carefully to know the component is damaged obviously or not, such as capacitance

burst, IGBT burst, power resistance burnt out and so on. Confirm the connecting wires

between PCB is right or not.

5. If need to change the board, please confirm the direct BUS voltage of eletrolysis

capacotance is discharged to zero.

6. Shake the connecting cable wire, check whether it is loose or not, if loose, please fasten

the screw of connecting terminal.

7. After maintenance, it should be checked and accepted by customer, and keep customer

service records

59

1 Introduction 1. maintenance man requirements On-line UPS generally provides regulation method of input / output specification, to improve reliability of the system. The locale debugging must be operated by skilled engineer who is trained and has relevant experience. Battery is periodic loss goods, general life length is about 3~5 years. So it is proposed to replace the battery once every 3 years. If you wont use the battery for a long time, charge the battery once every 2~3 months to supplement self-discharge. 2 maintenance tools required 1. Digital multimeter; 2. Oscillogragh: dual channel, 60MHz and probe pen (2PCS) with 10:1 attenuation function; 3. Digital current tester; 4. Screwdriver: - form and + form (cruciform); 5. Isolation transformer: if the oscillogragh probe pen has isolation function, it can be omitted; 6. Nipper pliers, wire cutter; 7. Load for battery discharge test (generally use incandescent bulb); 8. Cement resistance or 100W incandescent bulb that used for BUS electrolysis capacitance discharging;

60

2 Fault analysis and maintenance EP series UPS fault maintenance has some specificity, especially EP series UPS fault code inquiring method, make the maintenance more clearly oriented. Combine the fault code inquiring and LED, LCD displayed on the panel, can basically confirm UPS failure part. Failure phenomena of EP series UPS are very different, might not enumerate one by one. The followings are only experience summarized in locale maintenance. They are mainly the case analyses.

Internal Fault 1

This fault usually happens when change the system board, because forget to insert the power configuretion board (NF12223). Once close the SWBY, fault code will be displayed on LCD. Some faulty phenomena relevant to power configuration board are illustrated below: Problem: install one EP30KVA new UPS unit, find the LCD displays RT15, why? Because power display signal is from power configuration board. If it is not connected to system board, will influence the display. If power configuretion board is not inserted on the system board, what will happen? Phenomena: The machine gets power, after the panel displays normally, you can see Internal fault 1. It is usually because the power configuration board is not inserted or loose. Insert the configuration board or plug it again.

Internal Fault 2

Inverter fault The machine works on bypass mode, LCD displays Internal fault 2 i=XXXX XX This information is inverter fault. When carry out maintenance, close SWMB manual maintenance switch, open SWIN/SWBY/SWOUT, discharge the capacitance.Then check and measure as the folllowing steps: a. Close SWBY once again, check D13 / D29 of each inverter driver board, blink or not. b. Measure the fuse F1 / F2 on each inverter driver board, burn out or not. c. Measure IGBT driver terminal, break down or not. d. Measure three phases inverter output fuses, burn out or not. e. Check connection of output AC capacitance, loosen or not, burn out or not. f. Check relavant connection of inverter part, loosen or not. g. Change inverter control board.

Cases:

1) EP 80KVA Loud noise of UPS, especially noise of fan, it switches to bypass mode now, LCD displays Internal fault 2, i=0201 08, where is the fault? Go to the locale, close SWMB, restart up UPS, after self-checking, it shows internal fault 2, i=0201 08. After discharging, check and find fuse F1 of Phase 3 driver board, it has burnt out.

61

Change the fuse and fan, restart up, UPS operates normally. 2) EP 30 KVA UPS bypass mode, buzzer sounds long, LCD displays Internal fault 2, i=0403 08 Mainly check and measure inverter part as the above steps, corresponding fault information of 0403 clews: lockup by card or module IGBT 2 in inverter. Measure by multimeter, find connecting wire of Phase 2 output filter capacitance has broken. After changing it, restart up, UPS operates normally. Its caused by poor contact of connecting terminal. 3) EP 40 KVA One 20KVA UPS unit reports Internal fault 2, i=8001 0A, the reason? Corresponding fault code clews: lockup by card or module IGBT 3 in inverter. First mainly check the the fuse and inverter module of Phase 3 inverter driver board, break down or not. After the measure, find one side of Phase 3 inverter module has broken. Change it, then measure IGBT of the other two phases, its OK. Restart up, UPS operates normally. 4) EP 60 KVA UPS shows Internal fault 2, i=A001 08. Why? Fault code clews: Error at inverter power supply! Measure D21 and D20 on power supply board, find there is no output voltage. Power off, measure D21 and D20 by the multimeter, find them broken down. Change power supply board, UPS operates normally!

Internal Fault 3

When this fault happens, it may be caused by the following aspects: a. TLI winding is short. Measure the resistance of winding, the normal value is 3K or so. TLI winding power wire is well connected to No.5 and No.6 wire of J7 on interface board or not. b. Poor connection from auxiliary contactor of TLI to J7 of interface board. Mainly check the connection from No.3 and No.4 wire of J7 to TLI winding. c. Interface board is faulty.

Internal Fault 4

Rectifier fault When this fault happens, it may be caused by the following aspects: a. rectifier control board is faulty. b. rectifier driver board is broken.

Internal Fault 5

When this fault happens, it may be caused by the following aspects: a. One of the three phases input fuses on bypass board is burnt out. b. SCR (bypass board) fault.

Internal Fault 6

62

Cases:

One 40KVA unit is operating normally, suddenly inverter output indicator blinks, then switch to bypass mode. Bypass indicator is blinking, and Internal fault 6 shows on panel. Restart up, blank screen. This fault happens most on units produced before 2006, the main reason is capacitance C4 on power supply board is ineffective. Change power supply board, restart up, UPS operates normally. When UPS displays the fault: 1. Measure UPS bypass input three phase fuses, and fuse F7, F3 on bypass board, burn out or not. 2. Measure the voltage of D1/D7/D8/D19/D20/D26/D27/D35 on power supply board, normal value: 15vdc. Internal Fault 7

When this fault happens, it is mainly caused by poor connection of voltage feedback signal wire on inverter control board.

Internal Fault 8

When this fault happens, it may be caused by the following aspects: a. rectifier control board is faulty. b. Absorber circuit on rectifier driver board is faulty.

Internal Fault 9

When this fault happens, it may be caused by the following aspects:

a. TLB winding is short. Measure the resistance of winding, it is about 3K or so.

TLB winding power wire is well connected to No.4 and No.6 wire of J7 on interface board

or not.

b. Poor connection from auxiliary contactor of TLB to J7 of interface board. Mainly check the

connection from No.1 and No.3 wire of J7 to TLB winding.

c. F6 of bypass board is burnt out or not.

c. Interface board is faulty.

e. Main system board is faulty.

Case:

Before delivery, after loading and aging test, when get ready to package, start up UPS, it

reports Internal fault 9. Why?

Check as the above steps, have not found suspicious point. Check the connection from TLI

to interface board, measure again, find No.1 and No.3 of J7 to TLB winding is not well

connected. It may be the wire problems which result in the poor contact. Change the wire,

UPS operates OK!

Internal Fault 10

63

Cases:

Inverter mode operates normally, but sometimes report internal fault 10 and switch to

bypass mode. Why?

This failure is mainly because of the connection / poor contact of system control board and

inverter control board. Re-plug the connection terminal between J3 of system control board

and J7 of inverter control board, and the CPU of two control board. Measure the voltage of

D19/D20/D26/D27/D35 on power supply board, should be 15vdc, and voltage of D82 12vdc, voltage of D91 5vdc. If it still have problems, change the tow control board. Internal Fault 11

The failure represents: After closing SWIN / SWBY / SWOUT of UPS (that is after starting

up), press 2 - 2 can see I = 2204 40 (this parameter indicates that the inverter operates

normally), rectifier and inverter both have been started up, it is on bypass mode. When it is

on inverter mode, TLI and TLBY contactors switch back and forth!

The probabilities caused the failure are:

a. bypass board is broken.

b. main control board is faulty.

c. Interface board is faulty.

d. null line is poorly connected.

Cases:

EP 60KVA

One of the two parallel UPS units, usually reports Internal fault 11, but after the engineer

arriving at the locale, restart up and UPS operates normally. Why? After the inverter start up normally, use the multimeter measure the voltage difference between TLI and TLBY, find that after the switch failure, its about 20 VAC more than the maximum allowable value. Even change the main control board and bypass board, its still not improved obviously. It may be caused by poor contact. Check the connection of UPS again, find that output null line among the main circuit at connecting terminal is poorly connected, connect and fasten it, start up UPS and it operates normally! Briefly analyze: because of the poor connection of null line, resulting in the public

reference point of bypass circuit and inverter output circuit is offset, there exists greater voltage difference, that is not synchronized. At inverter mode there must be voltage difference 20VAC, by the feedback, the program identified as beyond the scope of synchronization, will not switch.

64

3 Failure code and inquiry

The following code is EP failure information code table:

TABLE OF MEMORIZED INTERNAL CODE / TABELLA CODICI INTERNI

For decode the internal microprocessor memorized code refer to the following table:

[s =system, c=load, b=bypass, r= rectifier, i=inverter, a=alarm] (*) only in parallel version

s=X... 1 3 5 7 9 B D F High system temperature 2 3 6 7 A B E F Initialisation error 4 5 6 7 C D E F System off command active. 8 9 A B C D E F Auxiliary input on system card.

s=.X.. 1 3 5 7 9 B D F System card power supply error. 2 3 6 7 A B E F Temporary anomaly in power supply card. 4 5 6 7 C D E F Synchronism error on system card. 8 9 A B C D E F Output frequency measurement error on system card.

s=..X. 1 3 5 7 9 B D F Continuous low voltage from battery or rectifier. 2 3 6 7 A B E F Continuous low voltage pre alarm from battery or rectifier. 4 5 6 7 C D E F Battery contactor open. 8 9 A B C D E F Permanent anomaly in battery contactor.

s=...X 1 3 5 7 9 B D F Permanent anomaly in power supply card. 2 3 6 7 A B E F Presence of the signal RS232 DSR_ON.. 4 5 6 7 C D E F Configuration circuit absent. 8 9 A B C D E F Jumper CONFIG2 absent.

c=X... 1 3 5 7 9 B D F Output overload, line 2 2 3 6 7 A B E F Output overload, line 3 4 5 6 7 C D E F Permanent overload. 8 9 A B C D E F Internal or load insulation loss.

c=.X.. 1 3 5 7 9 B D F High peak output current, line 1 2 3 6 7 A B E F High peak output current, line2 4 5 6 7 C D E F High peak output current, line3 8 9 A B C D E F Output overload, line 1

c=..X. 1 3 5 7 9 B D F Instantaneous output voltage error, line 2 2 3 6 7 A B E F Instantaneous output voltage error, line 3 4 5 6 7 C D E F Average output voltage error, line 1. 8 9 A B C D E F Average output voltage error, line 2. c=...X 1 3 5 7 9 B D F - 2 3 6 7 A B E F Output switch SWOUT open 4 5 6 7 C D E F Average out. voltage error, line 3. 8 9 A B C D E F Instantaneous output voltage error, line 1

65

b=X... 1 3 5 7 9 B D F Bypass line no. 3 input voltage erroneous 2 3 6 7 A B E F Bypass line frequency error 4 5 6 7 C D E F Sequence error in phases 1 and 2 at bypass line input 8 9 A B C D E F Manual bypass switch SWMB closed.

b=.X.. 1 3 5 7 9 B D F Active remote command bypass. 2 3 6 7 A B E F Static switch anomaly (SCR) for bypass 4 5 6 7 C D E F Bypass line no. 1 input voltage erroneous 8 9 A B C D E F Bypass line no. 2 input voltage erroneous

b=..X. 1 3 5 7 9 B D F SCR anomaly 2 3 6 7 A B E F Bypass line disabled. 4 5 6 7 C D E F Permanent anomaly on inverter output contactor 8 9 A B C D E F Bypass command active. b=...X 1 3 5 7 9 B D F Anomaly in inverter output contactor 2 3 6 7 A B E F Inverter output contactor open 4 5 6 7 C D E F Bypass line contactor closed. 8 9 A B C D E F Anomaly in bypass line contactor. r=X...-.. 1 3 5 7 9 B D F Low input voltage, line 2 2 3 6 7 A B E F Low input voltage, line 3. digit 1 4 5 6 7 C D E F No input current, line 1. 8 9 A B C D E F No input current, line 2 r=.X..-.. 1 3 5 7 9 B D F High input voltage, line 1 2 3 6 7 A B E F High input voltage, line 2 digit 2 4 5 6 7 C D E F High input voltage, line 3. 8 9 A B C D E F Low input voltage, line 1.

r=..X.-.. 1 3 5 7 9 B D F High rectifier temperature 2 3 6 7 A B E F High rectifier output voltage digit 3

4 5 6 7 C D E F Power supply error on rectifier control.

8 9 A B C D E F Rectifier input frequency error.

r=....X-.. 1 3 5 7 9 B D F No input current, line 3 2 3 6 7 A B E F Power limitation in rectifier. digit 4 4 5 6 7 C D E F Adjustment error in rectifier 8 9 A B C D E F Rectifier input line frequency error. r=....-X. 1 3 5 7 9 B D F Permanent anomaly rectifier 2 3 6 7 A B E F Error in voltage DRV1 in rectifier digit 5

4 5 6 7 C D E F Error in voltage DRV2 in rectifier

8 9 A B C D E F Error in voltage DRV3 in rectifier r=....-.X 1 3 5 7 9 B D F Anomaly in one section of rectifier. 2 3 6 7 A B E F -(SGP power fail *) digit 6 4 5 6 7 C D E F -(Parallel cable fail or SWMB close *) 8 9 A B C D E F -

66

i=X...-.. 1 3 5 7 9 B D F Error in inverter connections 2 3 6 7 A B E F Error in inverter power supply. digit 1

4 5 6 7 C D E F Error in inverter HFDRVR signal. (parallel syncro fail *)

8 9 A B C D E F Error in inverter HFDRVS signal ((parallel UPS Master *)

i=.X..-.. 1 3 5 7 9 B D F Cables reversed on pilot 2 3 6 7 A B E F Lockup by card or module 3 in inverter digit 2

4 5 6 7 C D E F Lockup by card or module 2 in inverter.

8 9 A B C D E F Istantaneous overcurrent

i=..X.-.. 1 3 5 7 9 B D F High voltage at inverter output 2 3 6 7 A B E F High continuous voltage at inverter input digit 3

4 5 6 7 C D E F High temperature on sensor 1 in inverter

8 9 A B C D E F High temperature on sensor 2 in inverter

i=....X-.. 1 3 5 7 9 B D F Inverter anomaly 2 3 6 7 A B E F Absence of synchronism between inverter and by pass linedigit 4

4 5 6 7 C D E F Active manual zeroing of inverter control

8 9 A B C D E F Auxiliary feeder error for IGBT modules

i=....-X. 1 3 5 7 9 B D F Low alternating voltage at inverter output 2 3 6 7 A B E F Low continuous voltage at inverter output digit 5

4 5 6 7 C D E F Active manual zeroing of inverter control.

8 9 A B C D E F Permanent inverter anomaly

i=....-.X 1 3 5 7 9 B D F High temperature on sensor 3 in inverter 2 3 6 7 A B E F Lockup by card or module IGBT3 in inverter digit 6

4 5 6 7 C D E F HFDRVT signal error in inverter (parallel serial data fail *)

8 9 A B C D E F Inverter disablement. a=X...-.... 1 3 5 7 9 B D F LOW BATTERY VOLTAGE 2 3 6 7 A B E F LOW INPUT VOLTAGE OR OVERLOAD [W]. digit 1

4 5 6 7 C D E F BATTERY DISCHARGED OR SWB OPEN

8 9 A B C D E F OUTPUT OVERLOAD. a=.X..-.... 1 3 5 7 9 B D F DISTURBANCE ON BYPASS LINE 2 3 6 7 A B E F MANUAL BY PASS, SWBM ON digit 2

4 5 6 7 C D E F BY PASS LINE VOLTAGE FAIL or SWBY, FSCR OFF

8 9 A B C D E F MAINS LINE VOLTAGE FAIL or SWIN OFF a=..X.-.... 1 3 5 7 9 B D F INTERNAL FAULT: 3 output contactor 2 3 6 7 A B E F INTERNAL FAULT: 4 rectifier lockup digit 3

4 5 6 7 C D E F INTERNAL FAULT: 5 bypass SCR.

8 9 A B C D E F INTERNAL FAULT: 6 feeder lockup.

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a=...X-.... 1 3 5 7 9 B D F TEMPORARY or PERMANENT BYPASS 2 3 6 7 A B E F BYPASS FOR OUTPUT VA < AUTO_OFF digit 4 4 5 6 7 C D E F INTERNAL FAULT: 1 no circ configuration. 8 9 A B C D E F INTERNAL FAULT: 2 inverter lockup a=....-X... 1 3 5 7 9 B D F BYPASS FOR OUTPUT OVERLOAD 2 3 6 7 A B E F ACTIVE BYPASS COMMAND; 8=COMMAND OFF digit 5

4 5 6 7 C D E F REMOTE BYPASS COMMAND: ACTIVE.

8 9 A B C D E F LOSS OF INTERNAL OR EXTERNAL INSULATION a=....-.X.. 1 3 5 7 9 B D F INTERNAL FAULT: 7 system card power supply. 2 3 6 7 A B E F INTERNAL FAULT: 8 one rectifier section digit 6

4 5 6 7 C D E F INTERNAL FAULT: 9 battery contactor.

8 9 A B C D E F INTERNAL FAULT: 10 inverter - converter comunicat a=....-..X. 1 3 5 7 9 B D F REMOTE SYSTEM OFF COMMAND: ACTIVE. 2 3 6 7 A B E F memory changed: CODE=.... digit 7 4 5 6 7 C D E F - INTERNAL FAULT: 11, inverter output connection or

bypass 8 9 A B C D E F - stop for internal timer a=....-...X 1 3 5 7 9 B D F OVERTEMPERATURE OR FAN FAILURE. 2 3 6 7 A B E F ERRONEOUS INPUT PHASE SEQUENCE. digit 8

4 5 6 7 C D E F OUTPUT OFF CLOSE SWOUT OR SWMB

8 9 A B C D E F SYSTEM OFF COMMAND ACTIVE; 8=DISACTIVATION.

p=X...-.. 1 3 5 7 9 B D F -Parallel card, RS 232 TX fail 2 3 6 7 A B E F - not used

digit 1 4 5 6 7 C D E F - not used 8 9 A B C D E F - Parallel card, spare line failure

p=.X..-.. 1 3 5 7 9 B D F - Parallel card, Bypass line failure 2 3 6 7 A B E F -Parallel card, Link failure Aux SWMB ON

digit 2 4 5 6 7 C D E F -Parallel card, RS 232 line failure 8 9 A B C D E F -Parallel card, Synch. line fail

p=..X.-.. 1 3 5 7 9 B D F -Parallel card, RS 232 rx fail 2 3 6 7 A B E F -Parallel card, Cable fail aux. SWMB ON

digit 3 4 5 6 7 C D E F -Parallel card, power fail 8 9 A B C D E F - not used

p=...X-.. 1 3 5 7 9 B D F -Parallel card, Ups master 2 3 6 7 A B E F - not used

digit 4 4 5 6 7 C D E F -Parallel card, slave data ok 8 9 A B C D E F -Parallel card, Synch. inverter bus fail

p=....-X. 1 3 5 7 9 B D F - not used 2 3 6 7 A B E F - not used

digit 5 4 5 6 7 C D E F - not used 8 9 A B C D E F - not used

p=....-.X 1 3 5 7 9 B D F -Parallel card, Synch. master-mains fail 2 3 6 7 A B E F -Parallel card, Synch. master freq. 60Hz on

digit 6 4 5 6 7 C D E F - not used

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8 9 A B C D E F - not used

Examples of inquiry method: a = 1003 - 0008

Find column-related information about a in the table:

a = 1 ... .. the corresponding right message: Low battery voltage

a =.0.. .. the corresponding right message: 0 for no fault, no matter.

a =..0. .. the corresponding right message: 0 for no fault, no matter.

a = ... 3 .. the corresponding right message: Temporary or permanent Bypass

a=. 0. the corresponding right message: 0 for no fault, no matter.

a=. ... the corresponding right message: The same as above.

a=. ...8 the corresponding right message: system off command

active:8=disactivation

i = B00008

I=B..... the corresponding right message: Error in inverter connection

i=.0000. the corresponding right message: 0 for no fault, no matter.

i=..8 the corresponding right message: inverter forbid

Other fault code inquiry information method is same as the above method, it will not be

repeated any more.

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4 Parallel maintenance

When carry out the maintenance, can refer to the following steps: 1) First remove the communication connecting cable between two parallel units, change into single unit operation. Switch the normal operating UPS unit to bypass mode, then close SWMB, and remove the communication connecting cable between the two parallel units. And connect the terminal. Failure UPS has been shut down, so can be directly removed, but the terminal must be connected. After removed the failure UPS, can switch the normal operating UPS to inverter output mode. 2) After finishing the maintenance of failure UPS, when no-load operating test is required, can change auxiliary NC contact beside SWOUT into NO contact. Close SWIN and SWBY, if the UPS has been maintained, it will switch into inverter output mode automatically, but will not affect the operation of parallel UPS unit. 3) After no-load operating test is finished, shut down the UPS, repeat the above step 2 -> step 1, restart up the two UPS units, parallel and operate them.

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5 Instructions of EP Series singe unit into parallel units:

10KVA80KVA

After receiving the UPS parallel kit, please confirm the components contained in the list, whether there are omitted or damaged parts.

Table 1. parallel kit components list table

Parts Name Parts Specification No. remark parallel installation manual

EP10-80KVA 1

parallel board C13943A 1 short block common use 2 parallel terminal female

DB9 1

parallel terminal male

DB9 1

parallel cable 1 3H/DML-9P+9S/2500MM 1 supporting bracket

2*DB9 1 parallel cable 1 has already connected with supporting bracket

parallel cable 2 2H/101-26P*2/300MM 1 parallel cable 3 3H/5557HP+5557HP+5557HP/200

0MM 1

parallel cable 4 2H/5557HP-2*3P*2/2000M 1 contactor auxiliary contact

F3-11D 1 parallel cable 4 has already connected with contactor auxiliary contact

parallel communication cable

2H/DB-9P+DB-9S/6000MM 1

Nylon terminal 10A/1P transparent 1 Nylon PCB support

for EP 3 for EP10-40K selection

Screw 1 M4*16 hexagon externality 1 for EP10-40K selection

Screw 2 M5*12 1 Screw 3 M3*8 4 for EP60-80K

selection Nut 1 M4 3 for EP10-40K

selection Nut 2 M5 1

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Parallel cable 1

Parallel cable 2

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Parallel cable 3

Parallel cable 4

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1. Installation

Before the installation, please remove the internal panel, right panel, control panel, top panel of parallel UPS units. Please install the kit components for parallel UPS units as the following steps. Install parallel control board: If the model is EP10-40KVA UPS, please accord [1] to install parallel board; If the model is EP60-80KVA UPS, please accord [2] to install parallel board; [1] Pull out 26P cable from J3 on system control board. Use nylon PCB support, Screw 1, Nut 1 to fix parallel board at the 4 holes before system control board, J1 and J2 of parallel board is on the left. The fixed-hole on upper right corner is grounding terminal of parallel board, use Screw 1 to connect it, use two units of Nut 1 to support between the rack and PCB board, then use one unit of Nut 1 to fix PCB board. Parallel cable 2 is used to connect J3 of system control board to J1 of parallel board. The pulled out 26P cable from J3 of system control board is connected to J2 of parallel board.

Cable 1

Cable 2 System board Parallel

board

Cable 3

26P cable pulled out from J3 of system control board is connected to J2 of parallel board.

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[2] Pull out 26P cable from J7 on inverter control board. Use Screw 3 to fix parallel board at the 4 fixed legs before inverter control board, J1 and J2 of parallel board is on the left. Parallel cable 2 is used to connect J7 of inverter control board to J2 of parallel board. The pulled out 26P cable from J7 of inverter control board is connected to J1 of parallel board.

2. Install other parallel cable:

Parallel cable 1 male terminal is connected to parallel control board J4. Use Screw 2 and Nut 2 to mount supporting bracket on the bottom which is under RS232 communication port.

1) 2*4P terminal of parallel cable 3 is connected to J5 of parallel board. 2) Remove the 12 pole terminal J7 of the interface board, connect it to 5557HP/2*6P needle

Cable 2 is connected J3 of system control board to J1 of parallel board.

Connect 9 pole male side of cable 1 to J4 of parallel board.

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block of parallel cable 3 . 3) 2*6P terminal of parallel cable 3 is connected to needle block J7 on interface board. 4) Bridge the cables that originate from the auxiliary of the SWMB switch using the nylon terminal. Substitute the originate cables bridged above with the two cables of parallel cable 3.

Connect the two separate terminal of cable 3 to SWMB auxiliary switch.

Connect 2*4P terminal of cable 3 to J5 of parallel board.

J7 of interface board Removed J7 terminal and 2*6P needle block of cable 3 J7 of interface board Removed J7 terminal and 2*6P needle block of cable 3

Connect 2*4P terminal of cable 3 to J5 of parallel board.

J7 of interface board Removed J7 terminal and 2*6P needle block of cable 3

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5) Substitute the connecting cable between J1 of auxiliary power supply board and J3 of SCR bypass board with parallel cable 4. 2*3P terminal (five wires) of parallel cable 4 is connected to J3 of SCR bypass board. 2*3P terminal (four wires) of parallel cable 4 is connected to J1 of auxiliary power supply board. Remove the top cover of inverter output contactor TLI, install the auxiliary contact to TLI contactor.

Connect the two terminals that originate from SWMB auxiliary switch using the nylon terminal (10A/1P transparent)

Substitute the original cable connecting J1 of power supply board with J3 of SCR bypass board with cable 4.

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2*3P terminal (five wires) of Cable 4 J3 of SCR bypass board 2*3P terminal (four wires) of Cable 4 J1 of power supply board

Remove the cover of TLI, install auxiliary contact to TLI contactor.

J1-1 (cable 4) is connected to the self-owned auxiliary contact 54, 62

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6) Install the connection between UPS and other parts: Install short block 1 on JP3 of system control board. Insert a male plug terminal (or female plug terminal) into the parallel terminal of first UPS unit; Use parallel connecting cable to connect the first UPS unit terminal to the second UPS unit terminal; Use parallel connecting cable to connect the second UPS unit terminal to the third UPS unit terminal; Insert a female plug terminal (or male plug terminal) into the parallel terminal of last UPS unit. 7) Parallel all the input and output of parallel UPS units by cables.

J3-1 (cable 4) is connected to the self-owned auxiliary contact 53 (NO) J3-3 (cable 4) is connected to the self-owned auxiliary contact 61 (NC)

JP3

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3. Check the connection:

Input / output cable is connected correctly and firmly Parallel connecting cable is firm, enter the UPS from the back or side Terminal connection is firm Internal signal cable is connected correctly and firmly After checking the electrical connections and internal connections, install the right panel, control panel, top cover of all the parallel UPS, internal panel is not installed temporarily.

Start up Before starting up, please confirm that the parallel UPS units share the battery pack or use a separate battery pack for each UPS. If share the battery pack, please install a short block at JP1 on rectifier control board of all the parallel UPS units. 1. Close SWBY of first UPS unit, you can see the UPS model "RT10, P" displayed on control panel (if the UPS model is EP10K). It means the UPS unit is EP10K parallel, and this UPS is defaulted as the Master UPS of all parallel UPS units. 2. If the parallel UPS units share battery pack, get into the control panel menu: 3 -> 5, input the code: 467123. At this time you will see the UPS model "RT10, B" displays on control panel (if the UPS is EP10K). It means the parallel EP10K UPS units share the battery pack, and this UPS is defaulted as the Master UPS of all parallel UPS units. 3. Close SWIN and SWOUT of the first UPS unit, wait the UPS into normal operating mode (NOMAL OPERATION). 4. Close SWBY of the second UPS unit, you will see the UPS model "RT10, p" dispalys on control panel (if the UPS model is EP10K), it means the UPS unit is EP10K parallel, and this UPS is defaulted as the Slave UPS of all parallel UPS units. If the parallel UPS units share battery pack, you will see the UPS model RT10, b displays on control panel (if the UPS is EP10K). It means the parallel EP10KUPS units share the battery pack, and this UPS is defaulted as the Slave UPS of all parallel UPS units. Close SWIN of the second UPS unit, get into the control panel menu 2>2 and wait till displaying I=220V. Close SWMB and then open, then all the started up UPS units switch to bypass mode. When the first UPS switches back to inverter mode, measure the voltage difference V1 of SWOUT upper and lower R, S, T phases on second UPS unit with multimeter AC posotion, if V1

EP Series _10-80KVA_ Service Manual

Documents

interface board

rectifier control board

inverter driver board

output sampling board

auxiliary power board

scr bypass board nf12345c

contents ep series ups

ep series ups specifications