MDC User Manual

8/14/2019 MDC User Manual

1/17

Users Manual for

MD Controller.

Indotech Industrial Solutions Pvt.Ltd1/2 Ankur Plaza Mumbai Banglore Highway Bridge

Warje Pune 411058


2/17

Indotech Industrial Solutions Pvt. Ltd.

MD Controller User Manual V 1.0 2Rising Indotech Shines Technology

CONTENTS

1)Introducing MD Controller2

2)How does it work? .3

3) Product Features4

4) Installation5

5) Device Functionality.6

6) Technical Details..12

5.1) Specifications..12

5.2) Indications and Switches..13

7) Appendices

Appendix A- Maximum Demand Terminology.14

Appendix B- Wiring Diagrams 15

Appendix C- Technical Support..16


3/17



1. Introducing MD Controller.

Non-domestic electrical power users often have to pay a maximum

demand charge in addition to the usual charge for the number of units

consumed. This charge is usually based on the highest amount of

power used during some period (say 30 minutes) during the metering

month.

The maximum demand charge often represents a large portion of the

total bill and may be based on only one isolated 30-minute episode of

high power use. Monitoring power use and turning off or reducing non-

essential loads during such periods of high power use can realize

considerable savings. The ETMD-04 is a realistically priced stand-alone

controller suitable for small to medium consumers wishing to reduce

their maximum demand in an economical and simple manner. The unit

can also be used for reducing cable and transformer loadings.

Apart from this ETMD-04 gives you a runtime Power usage and

continuous monitoring of Voltage, Current, and Power in kVA. On a

LCD display panel it shows the continuously varing readings.

At the controlling end ETMD-04 comes with the facility to control

certain activities of the plant. This can be achieved by giving the

threshold values of MD to the ETMD-04 via a keyboard. So in the

process of monitoring if it detects current MD grater than or closed to

user set MD then it can trip the switches or MCBs as per requirement.


4/17



2. How does it work?

MD controller works on principle of instantaneous readings of voltage

and current and calculating power in kVA. At the same time systems

Real Time Clock will keep track of time and calculates present MD.

Then according to the logic the current MD and the MD configured by

user is compared and the predefined load tripping action is taken.

After a predefined time it again calculates the MD. Now if the

calculated MD is less than the current MD then it reconnects the load

in proper sequence and if it is greater than the current MD then it trips

the next load. This action continues forever and thus the total load

gets controlled and the desired MD is restricted from reaching its

maximum limit.

In this manner a record of the average power use over the last 15

minutes is obtained in a so-called "sliding window". The ETMD-04 is

also available on request with a 15 or 30 min sliding window. The

controller compares this running average with a set target load value

and operates a set of relays if the target appears in danger of being

exceeded. The relay contacts are used to switch off non-critical

electrical loads and hence hold the overall load to a prescribed limit.

The unit also records the highest value of running average load to date

and operates an alarm relay when a new high is recorded. A visual

display is provided of the running average which can also display the

target value or the recorded maximum on request.


5/17



3. Product Features

Sr.No.

Description

1 Advanced micro controller technology.

2

Display of rms voltage, current, average &

instantaneous demand, at a time.

3Selectable display of maximum demand with date and

time.

4 Adjustable integration time 30/15 min.

5 Adjustable on and off delay.

6 Password protection for setting.

7Step less MD setting up to 500 KVA.

8 Programmable CT ratio.

9 4 Potential free contacts for tripping different loads.

10 *Interfacing to PC through RS232 is possible.

* Optional Feature


6/17



4. Installation

Electrical Connections

WARNING The MD Controller is to be used by qualified

personnel only. Do not install the ETMD-04 on

a power line unless you are qualified to do

so. High voltages that can cause burns and lethal

shocks are present when working on live power

line.

To assure operator safety, when making

connections to power lines, always start by

connecting the instrument power, which contains

the safety earth ground.

In order to install ETMD-04 at the clients end, one should follow the

procedure provided in user manual: -

Check the clients mains supply; get a clear idea about the power flow of

the existing plant.

Do the power connections as prescribed in the approved drawings.

(You can refer to the wiring diagram given in appendix A.)

Check the CT directions.

Adjust the CT ratio as pr the requirement.

Make connections of the loads as per requirement.

Check the calibration for voltage as well as current.


7/17



5. Device Functionality

It describes the user not only how to operate the system but

also gives a clear idea about the all the indications.

Lets start with the key functionality; on the front panel of the

PMR we have total five keys. Their functions are as below:

Auto/Manual Key : This key gives the provision to user

for shifting from auto to manual and vice-versa.

In manual mode the pages are displayed manually by

using UP-DOWN arrow keys.

In auto mode the pages will automatically scrolled at

predefined refresh rate.

Theses keys are used to scroll the display UP and DOWN.

The same keys are used as Yes and No keys for the

setting confirmation option.

The fourth key is a SET key. It is used for entering into

the configuration mode.


8/17



Apart from these keys the front panel also consists of some LED

message information. There are total of five LEDs, out of which one is

POWER indication LED and four are load indications LEDs.

The output relays are connected to the load control circuits inwhichever safe and reliable manner the user deems desirable.

Relay 1 is the lowest priority relay and is the first to operate in the

event of load shedding being required therefore use it to control loads

that are generally unimportant. Relay 2 is the next highest priority and

should control loads of slightly higher priority. Relay 3 operates when

the target has been exceeded and should be connected to loads of

high priority.

For better understanding of the device please refer the Page

Sequence diagrams in following pages.


9/17



Auto Mode


10/17



Manual Mode

R_Phase_Details

R_Phase_Details234.5V 0025 A

Y_Phase_Details

B_Phase_Details

Y_Phase_Details238.5V 0055 A

B_Phase_Details240.5V 0040 A

Total_KVA

Total_Power

0164KVA

A/M

Selecting

Auto Mode

SET

Entering into

Configuration Mode

A

B

D

E


11/17



Set and CurrentMD Details

Maximum_MDDetails

Set MD Curr.MD500KVA 150KVA

Max. MD192KVA

Instantaneous_MD220KVA

Instantaneous MDDetails

A/M

SelectingAuto Mode

SET

Entering into

Configuration Mode

A

C

B

D

E


12/17



Configuration Mode

*Press to SET accept and A/M to reject.

Entering

Confi uration Mode

Select MD Delay

UP DOWN

Set Delay 10

minutes.

Set MD 125 KVA

A/M SET A/MSET


13/17



6. Technical Details

Specifications

Sr.No.

Particulars Specifications

1 Power Supply 12 Volt DC @ 1A.

2 Measured Voltage Range 0-500 Volt AC (P-N)

3 Measured Current Range 0-1000 Amps, AC RMS/Phase

4 Phases Measured 1Ph / 3Ph-4 Wire

5 Display 16 Char, 2 Line Display

6 Operating Temperature -15 to 60C

7 Physical Dimensions (LxBxH) mm(110x192x96) mm

8 Weight 1 KG.

9 IP Protection IP 43

10 Mounting Panel Mountable


14/17



Indications and Switches

Indications

Indications

LEDs ON OFF

L1 Load 1 ON Load 1 OFF




Switches + Keys

Particulars Purpose

ON/OFF switch Power ON / OFF

A/M KeyAuto/Manual Parameter

Scanning Mode Selection.(NO for Confirmation)

Up Key UP Scrolling

Down Key DOWN Scrolling

SET

To Enter into Configuration

mode. (NO for Confirmation)


15/17



Appendix A: Maximum Demand Terminology.

Set MD :

It is the user configurable demand at which the user wishes to limit

his Maximum demand. (This is an instantaneous value and theloads will be cut-off after the load exceeds the set value)

Current MD::

It is the Maximum Demand of the user integrated over the period of15 min or hour as prescribed by the respective supplyingauthority.

Maximum MD :

It is the highest value of the Current MD during the specifiedperiod, it can be cleared by the user. At the rear side of the device

a RESET key is provided to reset these readings after it is checked.

Instantaneous MD :

It is the highest value of Instantaneous Demand placed by the

users load on the supply system during the specified period, it canbe cleared by the user.


16/17


17/17


MD Controller User Manual V 1.0 17

Appendix C: Technical Support.

Contact :

Indotech Industrial Solutions Pvt.Ltd1/2 Ankur Plaza, Mumbai Banglore Highway Bridge,Warje Pune 411058

Tele: 91-20-25232221Fax: 91-20-25231588Email:[email protected]

Web: www.indotechindustries.com

MDC User Manual

Documents