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What is the function of the shorting contactor for an ATS48? Is it a required component?

Issue:
What is the function of the shorting contactor for an ATS48?   Is it a required component?

Product Line:
Altistart 48

Environment:
All

Cause:
NA

Resolution:

A shorting contactor engages when the motor is running at full speed.  The starter provides proper sequencing of this contactor by the ``end of starting`` relay.  When the start is completed, the shorting contactor will be commanded to close.  The starter will continue to monitor the motor thermal state and provide motor overload protection.  Upon a stop command, the KM3 (shorting contactor designation) contactor will open, transferring the motor current to the SCRs to allow for a controlled deceleration if desired.

The shorting contactor is not required, but there are definite advantages to using one:
It extends the life of the internal electronics and SCRs due to the reduced heat effects of the current and SCR firing.
It reduces the heat dissipated by the controller.



CTA-ID : 7314
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