ACS355 faults with #1006 (PAR EXT RO) when I access the internal relay.


I have a ASC355 (with a FENA-11) and use the relay for a sound alert 3 secs before starting the motor. However, sometimes when I clear the relay (to stop the buzzer) the driver faults with PAR EXT RO and goes off-line for some 10 seconds.

I have verified that I write only 0001 and 0000 to the relay word (0134), and the relay works just fine most of the time. It seems to happen when I access the relay with a short time delay (ON and OFF within one second) but such a request must for heavens sake be acceptable.

Any ideas?

Best regards,


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asked 6 months ago



Hi Hans

the procedure that you use is correct, I have verified it in my test unit without errors, but obviously for short time...

What is the FW version in your drive? I have observed a little mistakes in few cases, easily resolved by updating the FW.

Let us know about the results of your test

Flavio Mussolin   

answered 6 months ago


By Skreddarn on 9/15/2017 | Like (0) | Report

Hej Flavio, and thanks for your prompt answer. The FW says 5100H and "Loading package" (whatever that means) reads 2201H.
(I bought the unit 3 weeks ago, and did not expect jurassic firmware...)

By Flavio Mussolin on 9/15/2017 | Like (0) | Report

Hi Hans
no, the 5100 is the latest, thankfully!
However, in one my recent application with ACS355 FW version 5100 and Ethercat fieldbus, to be able to run it with Beckhof master, I had to put a 5060 version. It's very strange, but sometimes it happens ....
I suggest you contact your local ABB distributor and try to ask for help, if you have not already done so.

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