3 phase SEW motor doesn't always start

[robw53]

we swapped the drive and no problems from then on, if the line was stopped at all you had to start the conveyor by hand, i didnt observe the reverse direction part this was just relayed to me from one of the engineers and i changed it when i got to work.

 

[DickDV]

Need a model number on the "drive". If it is a VFD and is set in vector mode without a motor model or one that doesn't match the motor, all of the above is possible.

 

[reefshark]

Need a model number on the "drive". If it is a VFD and is set in vector mode without a motor model or one that doesn't match the motor, all of the above is possible.

The model number of the drive is:

ACS355-03E-03A3-4

In the parameters:
9904 Motor CTRL MODE = Vector:Speed

 

[reefshark]

do you have a spare drive to swap it out, we had something similar we had a small conveyor that would not run unless you pushed the belt, it would also run the other direction if you pushed it the wrong way, the voltage coming from the drive was unbalanced across the phases.

Waiting on the spare drive now. The spare drive we had in stock had terminals that were stripped out.

 

[reefshark]

Is the motor located near the freq. drive? Some drives are limited to about 200 feet of wire or less from the motor to the freq. drive. Long motor leads can cause strange symptoms.

Only about 8' of wire between the drive and motor

 

[DickDV]

Running an ACS355 drive in Vector-Speed mode requires that a motor model be built (Para 9910). Then the loop gains must be set up in Group 23. You can start with about 10 in 2301 and 1second in 2302. Leave the others at default.

If these seem ok and the motor still doesn't start reliably, switch 9904 to Scalar-Frequency and see what happens. There will be less starting torque but it should be the same each time.

Also, due to minor differences in motors that are labeled the same, you cannot swap drives around on identical motors without re-running the ID mode.

 

[reefshark]

Running an ACS355 drive in Vector-Speed mode requires that a motor model be built (Para 9910). Then the loop gains must be set up in Group 23. You can start with about 10 in 2301 and 1second in 2302. Leave the others at default.

If these seem ok and the motor still doesn't start reliably, switch 9904 to Scalar-Frequency and see what happens. There will be less starting torque but it should be the same each time.

Also, due to minor differences in motors that are labeled the same, you cannot swap drives around on identical motors without re-running the ID mode.

As of right now here are my group 23 parameters

2301 = 5
2302 = .05 s
2303 = 0
2304 = 0
2305 = Off

So you are saying I should change
2301 to 10
and
2302 to 1 second

Are there any risks in doing this?

 

[DickDV]

No, those were just starting points. Leave them as they look like they were set up by someone. But, if the drives and motors have been moved around, a new ID run must be made at 9910.