Service And Maintenance - Danfoss VLT HVAC Drive FC 102 Operating Manual

Commissioning

4.7 Service and Maintenance

For PL d or SIL2, it is a must, for lower PL or SIL it is
recommended to conduct a functional test every 12
months to detect any failure or malfunction of the STO
functionality.
To conduct the functional test, perform the following steps
(or a similar method suitable for the application):
4 4
1. Remove the 24 V DC voltage supply at terminal
37.
2. Check if the LCP shows alarm 68, Safe Stop.
3. Verify that the frequency converter trips the unit.
4. Verify that the motor is coasting and comes to a
complete stop.
5. Verify that the motor cannot be started.
6. Reconnect the 24 V DC voltage supply to
terminal 37.
7. Verify that the motor is not started automatically
and restarts only by giving a reset signal (via bus,
digital I/O, or [Reset] key).
10
Safe Torque Off
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