Siemens Welding System ST PCS 7 User Manual

ET 200S distributed I/O

Siemens ST PCS 7 · November 2007

11

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• Completely factory-wired motor starters for switching and pro-

tecting any three-phase loads

• Can be used as a direct-on-line, reversing or soft starter
• High Feature motor starter with a combination comprising 

starter circuit breaker, solid-state overload protection and con-

tactor or soft starter up to 7.5 kW

• Safety-oriented motor starters based on the High Feature mo-

tor starters (direct-on-line and reversing starters) with integral 

redundancy function for shutdown reliability up to Category 4 

(EN 954-1)

• With self-assembling 50 A power bus, i.e. the load current is 

only supplied once for a group of motor starters

• Hot swapping is permissible
• Inputs and outputs for activating and signaling the states have 

been integrated

• Diagnostics capability for active monitoring of the switching 

and protection functions

• Can be combined with brake control module for controlling 

electromechanical brakes in three-phase motors

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Power modules and motor starters are operated on the terminal 

modules which are assigned to them in the tables in the sections 

"High Feature motor starters" and "Safety-oriented motor start-

ers". The terminal modules are a carrier system which is simulta-

neously used for the power supply to the motor starters (elec-

tronics: 24 V DC and load: 400 V AC). 
24 V DC for the electronics is provided by the power module in-

serted to the left of the first motor starter. The power module and 

the downstream motor starters constitute a potential group 

whose scope is limited by the current carrying capacity of the 

power module. When this limit is reached, a new potential group 

must be established with a further power module.
The load current is applied to the first (left) TM-xxxxS32 motor 

starter terminal module, and reaches the other motor starters via 

the power bus of the adjacent TM-xxxxS31 terminal modules. 

The power bus is designed for loads up to 50 A. When this limit 

is reached, a new load group must be started with a further 

TM-xxxxS32 terminal module, and provided with load current. 

High Feature and safety-oriented motor starters can be ex-

panded by a brake control module for controlling electrome-

chanical brakes in three-phase motors. The following modules 

are available:
• For brakes with external supply 24 V DC/4 A: 

- xB3 (with two optional inputs for special functions)

- xB1

• For brakes with internal supply 500 V DC/0.7 A: 

- xB4 (with two optional inputs for special functions)

- xB2

The externally supplied 24 V DC brakes can be released inde-

pendent of the switching status of the motor starter. The 500 V 

DC brakes, on the other hand, are generally supplied direct from 

the junction plate of the motor via a rectifier module and cannot 

be released if the motor starter is switched off. These brakes 

cannot be used in conjunction with the DSS1e-x motor starter 

(direct-on-line soft starter).
The outputs of the brake control modules can also be used for 

other purposes e.g. for controlling DC valves. Independent spe-

cial functions can be implemented with the help of two optional 

local inputs each on a brake control module xB3 or xB4 and a 

control module 2DI of the High Feature motor starter. These op-

erate independently of the bus and higher-level control, e.g. to 

implement rapid stop functions for slide controls.
Brake control modules are operated on different terminal mod-

ules depending on the design:

xB1 oder xB2

3RK1 903-0AG00

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xB3 oder xB4

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3RK1 903-0AG01

© Siemens AG 2007