Drum Motor / Roller Motor

Saturn_Europa

Saturn_Europa

Senior Member
Location
Fishing Industry
Occupation
Electrician Limited License NC, QMED Electrician
I wired in a drum motor in the factory I work at. The wiring diagram was on the cover plate for the motor termination box. I followed the wiring diagram for high voltage exactly:

1746278869207.png
The motor turned at a very low RPM, did not turn smoothly and overloaded the VFD in less than a minute.

There is a different belt conveyor right next to the one I am working on with the same model drum motor. It is wired according to the following high voltage wiring diagram and works:

1746279129217.png
After contacting the service rep, I tried the wiring the NEW non working motor like the one that is working. The motor did not turn at all.

Behind the termination plate you can see the 6 wires coming from the stator:

U1 - Yellow wire
V1 - Red wire
W1 - Blue wire

W2 - Black wire
U2- Gray wire
V2 - Brown wire

Looks like a pretty standard 6 lead European style motor.

The service rep was expecting a 9 lead motor. Currently we are shipping it back to the manufacture.

Any guesses on the proper way to wire this thing up?

I originally thought that it had the US style stator, the wrong wiring diagram, and it smoked when it was wired for the high voltage Y. But apparently the US stators are 9 leads and this one has 6.

The only 6 lead European motors I have wired are the SEW Eurodrive. They have the same color wires but the wires land on different terminals.

Is there a standard wiring method for 6 lead european motors based wire color? I looked in Ugly's. It only has 9 lead and 12 lead motors.



PS: I checked the drive, control wiring and power circuit by installing a different drum motor and it worked. All test runs were conducted with no belt on the drum.
 
What was supply voltage?

what was motor nameplate voltage?

Make sure you have a dual voltage motor here and not one designed for part winding starting, delta-wye starting or even a two speed motor.
 
Saturn_Europa said:
480v supply

dual voltage motor 240 v and 480 v
Click to expand...
A six lead motor cannot have two voltages that different by a factor of 2. You can only do that with a nine lead motor. A six lead motor has to have voltages that differ by the square root of three, as you wire them in delta for the low voltage and in wye for high voltage.
 
The manufacture was expecting 9 leads.

I told them there was 6 leads.

"Thats not correct, send pictures."

I sent pictures.

"Send the unit back to us."

Its been interesting. I'll let you know what they say.
 
don_resqcapt19 said:
A six lead motor cannot have two voltages that different by a factor of 2. You can only do that with a nine lead motor. A six lead motor has to have voltages that differ by the square root of three, as you wire them in delta for the low voltage and in wye for high voltage.
Click to expand...
What if the low voltage was wired YY and the high voltage was wired Y?


This name plate is from a different motor. A SEW Eurodrive.
1746377481795.jpeg
 
Saturn_Europa said:
What if the low voltage was wired YY and the high voltage was wired Y?


This name plate is from a different motor. A SEW Eurodrive.
Click to expand...
Is that a six lead motor. If so, you will have to show me the connection diagram. Not sure how you can go from a single wye to a double wye with only six leads in the motor junction box. Y and YY is the typical dual voltage US motor and they all have 9 leads.
 
I agree with how can you get 2:1 dual voltage with only six leads.

This one has funky speed rating though 1720/71?

Common NEMA motors with 9 leads are same speed same power at either voltage. There is more to the one in post 6. not sure how they come up with those two particular speeds.
 
1746387042832.png

This is the name plate of the motor in question. The motor has 6 leads. As Don stated it's not possible to have a 6-lead motor that's wired for 240/480v.

I am thinking that more than likely the wrong motor is in the drum. Probably an European style 230/400v motor. But I'll have to wait until the manufacture takes it apart and lets me know.

If it is a European style motor, I can wire it for Y high voltage of 400v. Change the voltage output setting the VFD to 400v. Set the motor base frequency to 50 hz, change the FLA / OL amps and hit full send?


1746387833031.png
 
Saturn_Europa said:
If it is a European style motor, I can wire it for Y high voltage of 400v. Change the voltage output setting the VFD to 400v. Set the motor base frequency to 50 hz, change the FLA / OL amps and hit full send?
Click to expand...

I would think so, I would probably test it with 415V and 50hz.
 
Saturn_Europa said:
View attachment 2577279

This is the name plate of the motor in question. The motor has 6 leads. As Don stated it's not possible to have a 6-lead motor that's wired for 240/480v.

I am thinking that more than likely the wrong motor is in the drum. Probably an European style 230/400v motor. But I'll have to wait until the manufacture takes it apart and lets me know.

If it is a European style motor, I can wire it for Y high voltage of 400v. Change the voltage output setting the VFD to 400v. Set the motor base frequency to 50 hz, change the FLA / OL amps and hit full send?


View attachment 2577280
Click to expand...
Is not labeled for 50 Hz. But might still be same design inside as ones that are sold to places with 50 Hz as standard? It will run at less RPM on 50Hz.
 
Marketing trickery…
It’s an IEC Delta/Wye 6 lead, but is a 230 Delta / 400 Wye 50 Hz, then if you give it 480/60Hz, it works fine because the V/Hz ratio is still correct (8:1 either way), it just just runs 20% faster. But if you give it 240|60Hz, the motor loses torque because you went from 4.6:1 at 230/50, to 4:1 at 240/60. So they have likely de-rated a larger (2Hp) motor figuring that nobody will complain about the added capacity at 230/50 or 480/60, especially since it is being sold to N.America where we wouldn’t notice or care. The tell is the really poor power factor, .63 is terrible! That’s because of it being a de-rated larger motor, so at the nameplate rating of 1-1/2HP, it’s not really fully loaded.
 
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