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Schindler Elevator (from Vienna, Austria) wants to start and stop the ATS48 by means of a contact on the isolation contactor. They did this with the ...

Goals and Symptoms

Schindler Elevator (from Vienna, Austria) wants to start and stop the ATS48 by means of a contact on the isolation contactor. They did this with the ATS46 with no fault. Now, the ATS48 gives PHF. What is the solution?
Until they have a solution, they will continue to use the ATS46. If we have no more ATS46, they will use a competitor's soft start.

Causes and Fixes

The PHF detection on the ATS48 is not the same like the ATS46.

ATS46: undervoltage on phases.

ATS48:
phases unbalance during 500 msec and
Absence of the three phases network simultaneously during 200 ms with the starting order.

In your case, the sequence is not standard but check the version of your starter , the PHF detection was improved since the version 1.1 ie09.
In your sequence you can use the R1 relay for the insulation contactor.

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