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Friday, November 17, 2017
The Motion Control Community Forum, sponsored by Control Technology Corporation.
Auto Start in ABB -AC Drive ACS850
Once we apply Emergency Stop from field or local panel, the drive trips/stops. While releasing the emergency it starts automatically.

I have more than 30 Drives of ABB ACS850. I am facing a problem with all the drives.

Once we apply Emergency Stop from field or local panel, the drive trips/stops. While releasing the emergency it starts automatically.
If we give stop command from the DRIVE CDP then this does not auto start.

From some drives if we reset the fault like over current it starts automatically.

What we need to change in the parameter?

1 out of 1 members thought this post was helpful...

How are your local and remote, from DCS or PLC, starts wired?

And what type of logic?

I have seen PLC motor start logic that holds the start contacts closed. This is a big mistake and can cause motors to cycle or restart when they should not.

ALL the start contacts, manual or automated, should be momentary with only the motor control or MCC sealing in the start. That way any stop or trip will drop out the motor contactor and the start circuit.
Resetting any trip will not restart the motor until a new start command is issued.

good luck

>How are your local and remote, from DCS or PLC, starts wired?

This is Single Digital Output for Start and Stop. This is happening only with CDP start.

By Bob Peterson on 16 November, 2017 - 7:45 am

It sounds like you may have the emergency stop contacts wired into the start circuit. If if so it is just a two wire circuit and the driver runs when the circuit is closed. You would need some kind of external logic to keep the drive from restarting if this is the case. It is hard to diagnose your problem with the limited information you have given. Most of these drives are used in the HVAC industry where you want them to restart automatically. If you don't want them to restart automatically you'll probably have to use a 3-wire control.