03/2016 Connection of a 3RA6 compact starter to SIMATIC S7 ... · Connection of a 3RA6 compact starter to ... also referred to as light / dark tests, are used to detect short ...

https://support.industry.siemens.com/cs/ww/en/view/60127182

FAQ 03/2016

Connection of a 3RA6 compact

starter to SIMATIC S7 F-DO SIRIUS 3RA6

https://support.industry.siemens.com/cs/ww/en/view/60127182

Connection of a 3RA6 compact starter to SIMATIC S7 F-DO Entry-ID: 60127182, V2.0, 03/2016 2

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This entry is from the Siemens Industry Online Support. The general terms of use (http://www.siemens.com/terms_of_use) apply.

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Table of contents 1 Question ............................................................................................................. 3

2 Answer ................................................................................................................ 4

3 Introduction ........................................................................................................ 5

3.1 Causes ................................................................................................. 5 3.2 Details of the self-tests ......................................................................... 5

4 Remedial measures ........................................................................................... 6

4.1 Adjusting the readback time (with ET 200S and ET 200SP systems) ............................................................................................... 6

4.2 Decoupling of the compact starter ....................................................... 6 4.2.1 Use of relay output modules for ET 200S (6ES7138-4FR00-

0AA0).................................................................................................... 7 4.2.2 Use of relay output modules for ET 200SP (6ES7136-6RA00-

0BF0) .................................................................................................... 8 4.2.3 Use of fail-safe PM-E F power module in combination with EM

DO output module of ET 200S ............................................................. 9 4.2.4 Use of fail-safe power module F-PM-E in combination with

output module DQ of ET 200SP ......................................................... 10 4.2.5 Use of coupling relays ........................................................................ 12 4.2.6 Use of diodes ..................................................................................... 13 4.3 Comparison of measures ................................................................... 14

5 Special features when connecting a 3RA6250 reversing starter ................ 15

5.1 Setup 3RA6250 controlling to ET 200S ............................................. 15 5.2 Setup 3RA6250 controlling to ET 200SP ........................................... 17

6 History............................................................................................................... 19

7 Contacts/ Support ............................................................................................ 20

http://www.siemens.com/terms_of_use

http://www.siemens.com/industrialsecurity

http://support.industry.siemens.com/

1 Question


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1 Question What do I have to keep in mind when I connect a 3RA6 compact starter to the fail-safe outputs of a SIMATIC S7 fail-safe controller?

2 Answer


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2 Answer The compact starters are frequently used in applications that require safe disconnection. If the 3RA6 compact starter is operated on a fail-safe output module of the ET 200M, ET 200S or ET 200SP, there may be incorrect interpretations of the fail-safe module due to the connected test signals for short-circuit detection.

The S7 fail-safe controller may passivate the output channel or output module. This may result in a safety-related shutdown of the application. Depending on the I/O system used, different measures can be implemented to ensure trouble-free operation.

This document explains the complete situation in detail.

3 Introduction


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3 Introduction The compact starters are frequently used in applications that require safe disconnection. Depending on the safety requirements, compact starters are combined with additional switchgear and then operated via safety relays, such as safety relays 3SK2, or outputs of fail-safe controllers.

The 3RA6 compact starters can be operated on many digital outputs without any problems due to their low power consumption. But error messages may be caused by self-tests of the fail-safe output modules of the SIMATIC S7 and the features of the control inputs of the 3RA6 compact starter. This FAQ describes the causes and some recommendations to remedy this situation.

3.1 Causes

The control supply voltage drops too slowly during disconnection due to the capacitive components in the control inputs and the low power consumption of the 3RA6 compact starters. This situation may result in an incorrect interpretation in the F-DO module, error message "short-circuit", caused by the self-test of the F-DO modules during operation on fail-safe outputs of SIMATIC S7. The S7-F controller passivates the respective module or channel (depending on the configuration) and the drive or group is safely shut down.

3.2 Details of the self-tests

Self-tests, also referred to as light-/ dark tests, are used to detect short-circuits (dark test) or interruptions (light test) at the control lines. To do so, the initial state at the digital outputs is changed for a short time and the voltage at the outputs is read back after a defined period of time (readback time).

If capacitive loads are connected, the voltage that is read back may be so high that the fail-safe output interprets it as short-circuit of the control line against the supply voltage.

See the respective manuals of the ET 200S, ET 200M and ET 200SP modules for more details regarding the maximum permitted capacities and remedial measures.

The modules of the distributed ET 200S and ET 200SP I/O system give you the option to set the readback time in a range from 1 ms up to 400 ms. The modules of the ET 200M operate with a fixed time of 1 ms.

4 Remedial measures


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4 Remedial measures The possible faults can be prevented by a number of measures. Below are only a few of these options.

4.1 Adjusting the readback time (with ET 200S and ET 200SP systems)

The default readback time of the ET 200S and ET 200SP modules is 1 ms. You can increase this time up to 400 ms. The longer the readback time, the larger the capacitive load on the outputs can be.

For operation of 3RA6 direct-on-line starters or reversing starters, we recommend setting the readback time individually during commissioning.

You have to consider, setting the readback time that there is no error message on the failsafe modules and no failure take place in the 3RA6. If the readback time is set to high the 3RA6 recognize the dark test and is switching in the puls of this test.

Note The readback time has to be matched on the own application.

Increasing the readback time will increase the internal processing time of the module. This will have an effect on the response time of the system. Note the data on readback and response times in the manual:

"Distributed I/O System ET 200S Distributed I/O System - Fail-Safe Modules".

“SIMATIC ET 200SP Distributed I/O system” – System Manual

4.2 Decoupling of the compact starter

Pay attention to the following notes for installation of safety-related components according to applicable standards:

Install coupling relays and diodes as closely as possible to the compact starter because there is no short-circuit test of the control line "behind" the relay/diode.

Install control lines either in the same control cabinet or through safe installation (e.g. in armored conduit) so that there is no possibility of a short circuit.

Readback of compact starters and contactors via positively driven NC contacts to evaluate the feedback circuit in the S7 F-CPU

4 Remedial measures


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4.2.1 Use of relay output modules for ET 200S (6ES7138-4FR00-0AA0)

The use of relay modules is particularly suitable for higher switching currents as well as capacitive loads.

Circuit diagram of direct-on-line starters 3RA6 up to SIL 1 to IEC 62061 or PLc to ISO 13849-1 on ET200S F-RO

Figure 1 Wiring diagram circuit direct-on-line starter 3RA6 on ET200S F-RO

Circuit diagram of direct-on-line starters 3RA6 up to SIL 3 to IEC 62061 or PLe to ISO 13849-1 on ET200S F-RO

Figure 2 Wiring diagram circuit direct-on-line starter 3RA6 on ET200S F-RO

4 Remedial measures


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4.2.2 Use of relay output modules for ET 200SP (6ES7136-6RA00-0BF0)

The use of relay modules is particularly suitable for higher switching currents as well as capacitive loads.

Circuit diagram of direct-on-line starters 3RA6 up to SIL 1 to IEC 62061 or PLc to ISO 13849-1 on ET200SP F-RO

Figure 3 Wiring diagram circuit direct-on-line starter 3RA6 on ET200SP F-RO

Circuit diagram of direct-on-line starters 3RA6 up to SIL 3 to IEC 62061 or PLe to ISO 13849-1 on ET200SP F-RO

Figure 4 Wiring diagram circuit direct-on-line starter 3RA6 on ET200SP F-RO

4 Remedial measures


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4.2.3 Use of fail-safe PM-E F power module in combination with EM DO output module of ET 200S

In this application, the compact starter can be switched for operation using the standard program and safety-related using the safety program. The limitation to SIL2/ PLe results from the combination of PM-E F and standard DO modules.

Note Pay attention to the notes for switching of loads that are not ground free in the documentation of the PM-E F power module p/m-switching.

Circuit diagram of direct-on-line starters 3RA6 up to SIL 2 to IEC 62061 or PLd to ISO 13849-1 on ET200S PM-E F pm DC 24V

Figure 5 Wiring diagram circuit direct-on-line starter 3RA6 on ET200S PM-E F pm

Circuit diagram of reversing starters 3RA6 up to SIL 2 to IEC 62061 or PL d to ISO 13849-1 on ET200S PM-E F pm DC 24V

Figure 6 Wiring diagram circuit reversing starter 3RA6 on ET200S PM-E F pm DC 24V

4 Remedial measures


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4.2.4 Use of fail-safe power module F-PM-E in combination with output module DQ of ET 200SP

In this application, the compact starter can be switched for operation using the standard program and safety-related using the safety program. The limitation to SIL2/ PLe results from the combination of PM-E F and standard DO modules.

Note Pay attention to the notes for switching of loads that are not ground free in the documentation of the PM-E F power module p/m-switching.

Circuit diagram of direct-on-line starters 3RA6 up to SIL 2 to IEC 62061 or PLd to ISO 13849-1 on ET200SP F-PM-E ppm DC 24V

Figure 7 Wiring diagram circuit direct-on-line starter 3RA6 on ET200SP F-PM-E ppm

4 Remedial measures


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Circuit diagram of reversing starters up to SIL 2 to IEC 62061 or PL d to ISO 13849-1 on ET200SP F-PM-E ppm DC 24V

Figure 8 Wiring diagram circuit reversing starter 3RA6 on ET200SP F-PM-Eppm DC 24V

4 Remedial measures


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4.2.5 Use of coupling relays

Coupling relays, such as 3RQ, can be switched between the outputs and the control inputs with capacitive loads. The coupling relays should be used as closely as possible to the 3RA6 control inputs so that a large part of the control line wiring can be monitored by the fail-safe output module. The use of additional switchgear (coupling relay) in the control lines must be taken into consideration when calculating the safety function.

Circuit diagram of direct-on-line starters 3RA6 up to SIL 1 to IEC 62061 or PLc to ISO 13849-1 on ET200M F-DO pp 24V DC

Figure 9 Wiring diagram circuit direct-on-line starter 3RA6 with coupling relay on ET200M F-DO pp 24V DC

4 Remedial measures


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4.2.6 Use of diodes

The series connection of the diode (e.g. diode terminal 8WA1 011-1EF20) in the control line must take place in the direction of the current. The diode prevents detection of the control voltage buffered by capacities in the 3RA6 at the utputs of the F-DO module during the readback time. The diodes should be used as closely as possible to the 3RA6 control inputs so that a large part of the control line wiring can be monitored by the fail-safe output module. It is not important for the function of the diodes whether or not they are installed in the "P line" or "M line".

Circuit diagram of direct-on-line starters up to SIL 1 to IEC 62061 or PL c to ISO 13849-1 on ET200M F-DO pp 24V DC

Figure 10 Wiring diagram circuit direct-on-line starter 3RA6 with diode on ET200M F-DO pp 24V

4 Remedial measures


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4.3 Comparison of measures

You can use the table below to decide which measure is best suited for the given application.

Effort

Measure Effect Components

Wiring Effect on safety assessment

Adjusting the readback time (with ET 200S and ET 200SP)

Monitoring adjusted

None None Increase response time of safety function

F-Relais Output (6ES7138-4FR00-0AA0; 6ES7136-6RA00-0BF0)

Electrically isolated decoupling

Medium Small Must be taken into consideration in the "Evaluate" subsystem with its own PFHD value

Coupling relay Electrically isolated decoupling

Medium Medium Must be taken into consideration in the "Respond" subsystem

Diodes Decoupling Low Low None

5 Special features when connecting a 3RA6250 reversing starter


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5 Special features when connecting a 3RA6250 reversing starter The 3RA6250 reversing starters have a shared reference potential (A2/B2 terminal) for controlling the two inputs (terminals A1 and B1). This means the ground wires at the fail-safe outputs of the ET200S and ET 200SP F-DQ cannot be returned but must be connected to the central "M terminal" of the power module (PM-E). The use of the "M switch" of the individual outputs is not an option.

5.1 Setup 3RA6250 controlling to ET 200S

Circuit diagram of reversing starters 3RA6 up to SIL 1 to IEC 62061 or PL c to ISO 13849-1 on ET200S PM-E F pm DC 24V

Figure 11 Wiring diagram circuit reversing starter 3RA6 on ET200S PM-E F pm DC 24V

Note The PFHD value of the module can be used for the safety-related calculation. Due to the single-channel architecture in the actuator circuit a maximum of SIL 1 to IEC 62061 or PL c to ISO 13849-1:2006 can be reached.



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Example of reversing starter 3RA6 SIL 3 to IEC 62061 or PL e to ISO 13849-1: 2006

If decoupling of the control inputs from the 3RA6 by diodes is selected, the least effort is required if only one diode is used in the "M line" (option 2).

The wiring example below shows the two-channel design of a reversing starter with a redundant feed-in contactor for safety-related disconnection up to SIL 3/PL e. The reversing starter and the feed-in contactor are controlled by their own respective output. The evaluation of the mirror contacts takes place in the S7 fail-safe controller.

You have the option to use diodes in the "P lines" or "M lines" to suppress the F-DQ message "Short circuit" if you are unable to increase the readback time or if this step is insufficient.

Circuit diagram of reversing starters 3RA6 up to SIL 3 to IEC 62061 or PL e to ISO 13849-1 on ET200S 4 F-DQ p/m

Figure 12 Wiring diagram circuit of reversing starter 3RA6 with diodes on ET200S F-DQ

Notes The PFHD value of the module can be used for the safety-related calculation.



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5.2 Setup 3RA6250 controlling to ET 200SP

Circuit diagram of reversing starters 3RA6 up to SIL 1 to IEC 62061 or PL c to ISO 13849-1 on ET200SP F-PM-E ppm DC 24V

Figure 13 Wiring diagram circuit reversing starter 3RA6 on ET200SP F-PM-E ppm DC 24V

Note The PFHD value of the module can be used for the safety-related calculation. Due to the single-channel architecture in the actuator circuit a maximum of SIL 1 to IEC 62061 or PL c to ISO 13849-1:2006 can be reached.



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Example of reversing starter 3RA6 SIL 3 to IEC 62061 or PL e to ISO 13849-1: 2006

If decoupling of the control inputs from the 3RA6 by diodes is selected, the least effort is required if only one diode is used in the "M line" (option 2).

The wiring example below shows the two-channel design of a reversing starter with a redundant feed-in contactor for safety-related disconnection up to SIL 3/ PL e. The reversing starter and the feed-in contactor are controlled by their own respective output. The evaluation of the mirror contacts takes place in the S7 fail-safe controller.

You have the option to use diodes in the "P lines" or "M lines" to suppress the F-DQ message "Short circuit" if you are unable to increase the readback time or if this step is insufficient.

Circuit diagram of reversing starters 3RA6 up to SIL3 to IEC 62061 or PL e to ISO 13849-1 on ET200SP 4 F-DQ p/m

Figure 14 Wiring diagram circuit of reversing starter 3RA6 with diodes on ET200SP F-DQ

Note The PFHD value of the module can be used for the safety-related calculation.

6 History


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6 History

Version Date Adjustment

V1.0 04/2012 First edition

V2.0 03/2016 Expansion controlling of ET 200SP

7 Contacts/ Support


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7 Contacts/ Support

Siemens AG

Technical Assistance

Tel: +49 (911) 895-5900

Fax: +49 (911) 895-5907

Mail: [email protected]

mailto:[email protected]

03/2016 Connection of a 3RA6 compact starter to SIMATIC S7 ... · Connection of a 3RA6 compact starter to ... also referred to as light / dark tests, are used to detect short ...

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