Maintenance
After the operation of the safety circuit has been verified at start-up, the circuit requires a
periodic proof test at least every two years.
If you change any wirings or components related to the motor thermal protection function
after the start-up, repeat the procedure given in section Start-up and acceptance
test (page 26).
Fault tracing
For the warning and fault messages generated by the drive, see the drive firmware manual.
For the fault indication LEDs of the PTC relays, see section PTC thermistor relays (page 22).
For the status LEDs of the FSO module, see the FSO module user’s manual.
Safety data and block diagrams
The safety block diagrams show the components that are included in the safety data
calculations.
￭ Without an FSO module
Customer motor PTC sensor(s)1
Thermistor relay(s)2
• K74
• (K75)
• (K76)
Drive STO3
PFD
avg
(1…3 relays)T
1
HFTSIL
5.00E-22 years01
3AXD10000331763 E
ATEX-certified motor thermal protection function with PTC thermistor relays (+L513+Q971) 27
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