Service functions and error messages
Page 127
Meaning of the error message
4 FSM: Fault in SSIO communication Cause: Error in the internal communication connection
between the basic device and the safety module.
Action:
Identify interfering radiators in the environment of
the servo drive.
Replace module or basic device.
Please contact the Technical Support.
5 FSM: Fault in FSM break control Cause: Internal hardware error (brake activation control
signals) of the safety module or fieldbus
activation module.
Action: Module presumably defective. If possible,
replace with another module.
Cause: Error in brake driver circuit section in the basic
device.
Action: Basic device presumably defective. If possible,
replace with another basic device.
52 1 Safety function: Discrepancy time
overrun
Cause: Control ports STO-A and STO-B are not actuated
simultaneously.
Action: Check discrepancy time.
Cause: Control ports STO-A and STO-B are not wired in
the same way.
Action: Check circuitry of the inputs.
Cause: Upper and lower switch supply voltage not
simultaneously activated (discrepancy time
exceeded)
Error in control / external circuitry of safety
module.
Error in safety module.
Action: Check circuitry of the safety module – are the
inputs STO-A and STO-B switched off on two
channels and simultaneously?
Replace safety module if you suspect it is faulty.
2 Safety function: Failure of driver supply Cause:
Failure of driver supply voltage with active PWM.
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