SINAMICS G120
Inverter chassis units 0.37 kW to 132 kW (0.5 hp to 200 hp)
Supplementary system components
Safe Brake Relay
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Siemens D 11.1 · 2008
3
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Overview
The Safe Brake Relay allows the Power Module to be safely con-
nected to an electromechanical motor brake, allowing the brake
to be directly and safely controlled by the Control Unit in accor-
dance with EN 954-1, safety category 3, and IEC 61508 SIL 2.
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Selection and Ordering Data
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Integration
The Safe Brake Relay has the following interfaces:
• A two-channel transistor output stage to control the motor
brake solenoid
• A connection for a 24 V DC voltage supply
• A connection for the cable harness (CTRL) for connection to
the Power Module
The Safe Brake Relay can be mounted on the shield bonding
plate near the power terminals of the Power Module.
The supplied Safe Brake Relay includes the cable harness for
connection with the Power Module.
The 24 V DC solenoid of the motor brake is directly connected to
the Safe Brake Relay. External overvoltage limiters are not re-
quired.
Typical connection of Safe Brake Relay
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Technical specifications
Order No.
Safe Brake Relay including cable
harness for connection to the Power
Module
6SL3252-0BB01-0AA0
U2
V2
W2
PE
M
3 ~
Power
Module
Safe Brake Relay
CTRL
COIL
M
+
M
+
M
+
BR-
BR+
G_D211_EN_00071
ext.
24 V
PM-IF interface
Cable harness
Safe Brake Relay
Supply voltage
20.4 … 28.8 V DC
Recommended rated value of the
supply voltage 26 V DC (to equalize
and compensate for the voltage drop
along the feeder cable to the 24 V DC
solenoid of the motor brake)
Current requirement of motor
brake, max.
2 A
Current requirement at 24 V
DC, max.
0.005 A + current drain of motor brake
Conductor cross-section,
max.
2.5 mm
2
Degree of protection IP20
Dimensions
• Width 68 mm
• Height 63 mm
• Depth 33 mm
Weight, approx. 0.17 kg
Safe Brake Relay
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