95
item Controller BL 1-04 /C
― Product manual
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 appro
-
priate 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 necessa
-
ry, 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.
