ABB ACH400 Drive Troubleshooting

[jayguy]

anyone have any documentation for these drives. one of our other techs had this drive showing 60 Hz without a contactor pulled in. he cycled power and it came up and ran just fine. he is worried that it will happen again and we have not heard of a drive that would do this.

any thoughts or troubleshooting bulletins?

thanks!

[Dallas Duster]

Did it have the electronic bypass on it?

[tunaguy]

http://library.abb.com/global/scot/scot239.nsf/veritydisplay/ac6569d566c7d3b7852571c3006b43a6/$File/ACH402_US_04_Web.pdf

Sounds like he reset the alarm when he reset power. He should be able to pull up alarm history. Good Luck

www.abb.us/drives

[hvac_superman]

What contactor are you refering too and how is it wired in the system?

[jayguy]

all good questions and i haven't a clue as to the answer...sorry. i am not very familiar with this particular drive. i will pass along the questions.

[york56]

Here is the VFD operation manuel check the fault code descriptions this may help you out , good luck

[flange]

probably had some sort of failure that wasnt critical. the 60 htz was probably the frequency reference, since it was in failure, whatever ws controlling it may have been ramping up the signal in an effort to make it run. cyclingpower reset her. common issue with drives. those are nice little drives.

[mustardman]

anyone have any documentation for these drives. one of our other techs had this drive showing 60 Hz without a contactor pulled in. he cycled power and it came up and ran just fine. he is worried that it will happen again and we have not heard of a drive that would do this.

any thoughts or troubleshooting bulletins?

thanks!

A lot of settings on those drives require power to be cycled before they take. If you have the electronic bypass enter the settings through the bypass for the most part. Was there a drive fault error there is a procedure for relinking the bypass and drive.

[sokoservices]

IF the customer has a phase monitor, that could be a problem also. I have seen some phase monitors installed in correctly and the drive would call for the fan to ramp and the fan wouldnt but it said it was. It more then likely a phase problem you encountered. These drives have a monitor for under and over voltage on them. Its when you reset the unit it will clear the alarms. I have 6 of these that I work on all the time. We put phase monitors on them between the drive control wiring and the drive to the fan, this allows any in ballance in phase to be caught early, and hopefully not to damage the drive or the motor.

Check the logs for the alarms. This is where it will say under or over voltage. You can also set it up to auto reset. I Dont like to do this because I like to physically check out the unit before its put back online.

The Bypasses aer really nice also. If for some reason the DRIVE part stops working you turn the swithc to bypass and it runs full out.

I have seen where the drive was put in bypass but in standby and the drive would not run. This is simple fix, just click on the drive buttons and release the drive back to run in the drive mode.

I really like these drives compaired to the others i have used.

If you have any more problems let me know I can research them for you.