Siemens SINAMICS G130 Manual page 72

Safety integrated
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Safety Integrated Basic Functions
5.3 Safe Brake Control (SBC)
Two-channel brake control
Note
Connecting the brake
The brake cannot be directly applied at the motor module of the chassis design. The
connection terminals are designed only for 24 V DC with 100 mA; additional hardware is
necessary for higher currents and voltages.
The brake is essentially controlled from the Control Unit. Two signal paths are available for
applying the brake.
For the "Safe Brake Control" function, the Motor/Power Module assumes a monitoring
function to ensure that when the Control Unit fails or malfunctions the brake current is
interrupted therefore closing the brake.
The brake diagnosis can only reliably detect a malfunction in either of the switches (TB+, TB-
) when the status changes (when the brake is released or applied).
If the Motor/Power Module or the Control Unit detects a fault, the brake current is switched
off and the safe condition is thereby achieved.
Response time with the "Safe Brake Control" function
For the response times when the function is selected/deselected via input terminals, see the
table in chapter "System features", subchapter, "Response times".
Example - booksize design
Safety Integrated Basic Functions via terminals:
Safety monitoring clock cycle CU (r9780) = 4 ms and
inputs/outputs sampling time (p0799) = 4 ms
t
R_type
t
R_max
Overview of important parameters
● p0799 CU inputs/outputs sampling time
● p9602 SI enable, functions integrated in the drive (Control Unit)
● r9780 SI Monitoring clock cycle (Control Unit)
● p9802 SI enable safe brake control (Motor Module)
● r9880 SI monitoring clock cycle (Motor Module)
72
= 4 x r9780 (4 ms) + p0799 (4 ms) = 20 ms
= 8 x r9780 (4 ms) + p0799 (4 ms) = 36 ms
Safety Integrated
Function Manual, 05/2010, A5E03264275A

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