ABB ACS 1000 ac drive


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ABB ACS 1000 AC drive tripping on over speed. Which parameter will help to increase over speed limit? Drive was running without problem since more then 3 years. Drive was running at 1100 rpm reference.

1.Drive rating-ACS 1000(3300V & 760A )

2.Drive Type-ACS 1013-W2-XA-00-FM03-B0NA-0C50-055E-00000-EN

3.Application-Rubber mixing (Variable load/Speed)

4.Motor details-2125kW,3300V,991.4RPM,435A

5.Drive parameter backup-Attached in Txt format

Why such change after 3 years? What is reason for over speed after 3 years?

The only way to get an Over Speed fault on that drive is if the LOAD is pushing the MOTOR, instead of the other way around. In other words, the drive is telling the motor to run at 600RPM for example, then something in the load is OVER diving the motor to 700RPM. That turns the motor into a generator, which on a VSI drive like that, charges up the DC bus until it has to trip to protect itself. There will be no "parameter" solution to this, you need to find out what has changed in your process that is causing it and fix it. On smaller LV drives you might be able to add a braking resistor, but that's not an option on a 3300V drive.

Is this by chance a "Banbury" mixer? That's a type where there are two counter rotating lobed screws that you place a block of solid rubber into and the twisting force of the screws "explodes" it on the other side. If so, it could be that someone has tried to speed up the process by forcing the blocks in faster. That then can cause the screws to transmit that extra force back into the motor, over speeding it. Find out who thought that was a good idea and tell them it can't work that way.
You don't fix a problem of having over speed trips on an existing installation by adjusting the over speed trip parameter or trip point. Either your machine thinks it has an over speed condition and it does or your machine thinks it has an over speed condition but it doesn't. Find out which condition is true and then fix the problem.

The first question to ask when having problem with an existing application known to have worked properly before is, "Have you messed with it?" If so, what did you do? Existing systems that suddenly change commonly means something has been changed in the system (not necessarily a failure). What changes have been made around the drive or the equipment or process the drive services? Make sure that no operational changes or "unauthorized" changes have been made. If no changes have occurred, it is likely that you have an equipment failure such as a bad speed sensor or a drive unit component (but changes can be sometimes surprisingly difficult to find or locate - tricky devils).

William (Bill) L. Mostia, Jr. PE
ISA Fellow, SIS-TECH Fellow,
FS Eng. (TUV Rheinland)
SIS-TECH Solutions, LP
713-909-2139 (o)


I wonder if ABB VFD has bypass cabinet. what if VFD shut down, do all the process will be stopped, until maintenance to fix it?

In this case we cannot use ABB drive to control some important load, like my sugar mill projects, sugarcane cutter or presser, only 4 months working time per year, once shut down, then it will cause a lot of lose.

Do we have any better solution for VFD control some important application?