15 Appendix
Group 54: FSM: Violation of safety conditions
54-0 SBC: safety condition
violated
Cause:
Brake should engage; no feedback received
within the expected time.
Measure:
- Check how the feedback signal is configured –
was the correct input selected for the feedback
signal?
- Does the feedback signal have the correct
polarity?
- Check whether the feedback signal is actually
switching.
- Is the parameterised time delay for the analysis
of the feedback signal appropriate to the used
brake (measure switching time if necessary)?
54-2 SS2: safety condition
violated
Cause:
Actual speed outside permitted limits for too long.
Measure:
Check when the violation of the safety condition
occurs:
a) During dynamic braking to zero.
b) After the drive has reached zero speed.
- With a) Check of braking ramp – record the
speed - can the drive follow the ramp? Change
parameters for the slowdown ramp or start time /
delay times for monitoring.
- With a) If the option "Activate quick stop ramp in
base device" is activated: Check of the servo
drive's quick stop ramp.
- With b) Check whether the drive continues to
oscillate after reaching the zero speed or remains
at idle and stable – increase monitoring tolerance
time if necessary.
- With b) If the actual speed value is very noisy
when at rest. Check and if necessary adjust
expert parameters for speed recording and
detection of standstill.
54-3 SOS: safety condition
violated
Cause:
- Angle encoder analysis reports "Motor running"
(actual speed exceeds limit).
- Drive has rotated out of its position since
reaching the safe state.
Measure:
- Check the position tolerance for the SOS
monitoring and increase if necessary, if this is
permissible.
- If the actual speed value is very noisy when at
rest: Check and if necessary adjust expert
parameters for speed recording and detection of
idling.
Product manual BL 4000-C Page 284 of 298
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