15 Appendix
54-4 SS1: 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.
54-5 STO: safety condition
violated
Cause:
Internal hardware error (voltage error) of the
safety module.
Measure:
Module presumably defective. If possible,
replace with another module.
Cause:
Error in driver circuit section in the servo drive.
Measure:
Servo drive presumably defective. If possible,
replace with another servo drive.
Cause:
No feedback received from servo drive to
indicate that output stage was switched off.
Measure:
Check whether the error can be acknowledged
and whether it occurs again upon a new STO
request – if yes: Servo drive presumably
defective. If possible, replace with another servo
drive.
Product manual BL 4000-C Page 285 of 298
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