JKS
Member
Gentlemen;
Have a bit of an odd one - a customer has a PF400 running a vacuum pump motor. They said they changed the motor out 3 months ago, and then at some point, the drive died.
They then changed out the drive with a brand new PF400, and it ran fine for about a month, at which point it would not reach the commanded speed, and in fact would only get to about 4-6 Hz.
They pulled that drive and sent it back for analysis/repair as it was still under warranty, and put in a re-manned from AB.
This drive is doing the same thing - it will not get above 4-6Hz, yet pulls about 80A. Here are the specs:
PF400: 22C-088A: 60Hp, 480VAC, 90.0A
Motor: 60Hp, 460VAC,65.1FLA, 3560rpm
Notes:
- It behaves the same in manual as it does in Auto; ie, won't ramp past 6 Hz
- It does not sit at that speed but rather bounces around between 3-6Hz
- The speed of the motor is 3560rpm (per nameplate) but they had it in the parameters as a 4 pole motor (fixed, obviously)
- A170 was left as Default; when I tried to run some boost to it, (via either a Custom V/Hz curve or a pre-set boost curve), the drive would trip out on Overcurrent immediately on start. Fault current was 162.5A.
- The motor seemed to megger fine: insulation tests from each phase to ground were in the 40Meg range (40 @ 1000V; 45 @ 500V).
- the motor did, however, feel hot and smelled burnt, but that could simply be from running at a low speed (it is a TEFC motor).
- The motor bearings are grounded.
- You can spin the coupling by hand, in both directions, with no effort.
- They tried to run the motor de-coupled and everything acted the same way.
- I ran the drive with the motor leads disconnected and the drive acted Ok; ie, it ran up to the commanded speed.
- Whether in manual or auto, the commanded speed is correct.
- There were no other errors to the parameters that I could see. They had good documentation that included a list of non-default parameters, and it all checked.
Anyone with any good ideas here? We dealing with some odd gremlin in the drive, or a bad rebuild on that motor? I'm open to anything at this point!
Thanks!
- Jeff
Have a bit of an odd one - a customer has a PF400 running a vacuum pump motor. They said they changed the motor out 3 months ago, and then at some point, the drive died.
They then changed out the drive with a brand new PF400, and it ran fine for about a month, at which point it would not reach the commanded speed, and in fact would only get to about 4-6 Hz.
They pulled that drive and sent it back for analysis/repair as it was still under warranty, and put in a re-manned from AB.
This drive is doing the same thing - it will not get above 4-6Hz, yet pulls about 80A. Here are the specs:
PF400: 22C-088A: 60Hp, 480VAC, 90.0A
Motor: 60Hp, 460VAC,65.1FLA, 3560rpm
Notes:
- It behaves the same in manual as it does in Auto; ie, won't ramp past 6 Hz
- It does not sit at that speed but rather bounces around between 3-6Hz
- The speed of the motor is 3560rpm (per nameplate) but they had it in the parameters as a 4 pole motor (fixed, obviously)
- A170 was left as Default; when I tried to run some boost to it, (via either a Custom V/Hz curve or a pre-set boost curve), the drive would trip out on Overcurrent immediately on start. Fault current was 162.5A.
- The motor seemed to megger fine: insulation tests from each phase to ground were in the 40Meg range (40 @ 1000V; 45 @ 500V).
- the motor did, however, feel hot and smelled burnt, but that could simply be from running at a low speed (it is a TEFC motor).
- The motor bearings are grounded.
- You can spin the coupling by hand, in both directions, with no effort.
- They tried to run the motor de-coupled and everything acted the same way.
- I ran the drive with the motor leads disconnected and the drive acted Ok; ie, it ran up to the commanded speed.
- Whether in manual or auto, the commanded speed is correct.
- There were no other errors to the parameters that I could see. They had good documentation that included a list of non-default parameters, and it all checked.
Anyone with any good ideas here? We dealing with some odd gremlin in the drive, or a bad rebuild on that motor? I'm open to anything at this point!
Thanks!
- Jeff