Question

My GS3 won't auto-start after a power outage ( or after a shift to generator power). What can I do to correct this?

Answer

Momentary Power Loss
The GS3 drives have a maximum setting of 5.0 seconds for P6.02 ( Momentary Power Loss), but larger GS3 drives ( about 5 hp and up), can actually take longer to fully power down.

So if the power is off for 6-12 seconds, the drive becomes stuck in a gray area, and won't go back into RUN.

What is ideal is to have a main supply contactor upstream of the drive, that is controlled by a Time Delay Relay, in On-Delay mode.
Once the power comes back on, the TDR begins timing, and after 15 seconds, it closes the Normally Open contact pair it energizes the contactor, which supplies power to the drive. The drive had sufficient time to fully power down, and will power up normally.

As an alternative, use the TDR to make sure the RUN signal doesn't come on to the drive till after that 15 second period. The TDR breaks the signal from DCM ( or +24, depending on drive setup) and Digital Input 1. So the TDR is powered up, as before, and after 15 seconds, it closes its' contacts and makes the circuit into Digital Input 1, for the RUN command.

MS4SM-AP-ADC is an example TDR
TP411X base for TDR

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FAQ Subcategory: None

This item was last updated on 11-27-2018
Document ID: 1603

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