Siemens ST PCS 7 manual Motor starters, 11/49, Brake control modules for motor starters

© Siemens AG 2007

Process I/O

ET 200S distributed I/O

Motor starters

■Overview ■Design

•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

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.

Brake control modules for motor starters

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 11 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:

Brake control	Terminal module for brake control module
modul
xB1 oder xB2	TM-xB15S24-01	--
	3RK1 903-0AG00
xB3 oder xB4	--	TM-xB215S24-01
		3RK1 903-0AG01

Siemens ST PCS 7 · November 2007

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