Danfoss VLT Midi Drive FC 280 Operating Instructions Manual page 38

Safe Torque Off (STO)
Diagnostic functional test
1. Verify that warning 68, Safe Stop and alarm 68,
Safe Stop do not occur when 24 V supply is
connected to terminals 37 and 38.
2. Remove the 24 V supply for terminal 37, and
verify that the LCP displays alarm 188, STO
Function Fault if the LCP is mounted. If the LCP is
not mounted, verify that alarm 188, STO Function
Fault is logged in parameter 15-30 Alarm Log: Error
Code.
3. Reapply 24 V supply to terminal 37, and verify
that resetting the alarm is successful.
4. Remove the 24 V supply for terminal 38 and
verify that the LCP displays alarm 188, STO
6 6
Function Fault if the LCP is mounted. If the LCP is
not mounted, verify that alarm 188, STO Function
Fault is logged in parameter 15-30 Alarm Log: Error
Code.
5. Reapply 24 V supply to terminal 38 and verify
that resetting the alarm is successful.
36
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VLT Midi Drive FC 280
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