Configuration Manual Synchronous Motors 1FK7 - Siemens ...

Motor Components (Options)
Holding brake
4.3.3 Protective circuitry for the brake
Caution
In order to avoid overvoltages when shutting down and the possible negative impact on the
plant or system environment, a protective circuit must be integrated into the brake feeder
cable (refer to Fig. "Recommended circuit for the external power supply with protective
circuit").
If protective circuitry is not used, voltage peaks up to 1000 V can occur in the millisecond
range. Brake solenoid, switching contacts and electronic components could be destroyed.
Sensitive electronic components (e.g. logic components) can even be damaged as a result of
a lower switch-off voltage. The power limits (e.g. ratings) of the components used should be
carefully observed.
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Fig. 4-5 Recommended circuit for the external power supply with protective circuit
Table 4-12: Example: Electronic components for the recommended circuit
Electr.
component
F 3RV10 circuit-breaker with current
paths connected in series (if required
with mounted auxiliary contact
3RV1901 to provide a feedback signal
for the drive).
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Examples
or Miniature circuit-breaker
5SX21 (if required with mounted
auxiliary contact to provide a feedback
signal for the drive).
K1 Auxiliary contactor 3RH11 or Contactor 3RT10
R2 Varistor
SIOVS14K30 (EPCOS)
1FK7 Synchronous Motors
4-12 Configuration Manual (PFK7), 10/2005 Edition, 6SN1197-0AD06-0BP1
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