Danfoss VLT HVAC Drive FC 102 Panduan Pengoperasian - Halaman 12

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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):

Remove the 24 V DC voltage supply at terminal

37.

Check if the LCP shows alarm 68, Safe Stop.

Verify that the frequency converter trips the unit.

Verify that the motor is coasting and comes to a

complete stop.

Verify that the motor cannot be started.

Reconnect the 24 V DC voltage supply to

terminal 37.

Verify that the motor is not started automatically

and restarts only by giving a reset signal (via bus,

digital I/O, or [Reset] key).

Safe Torque Off

MG37D502