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Old 04-16-2011, 11:55 AM   #1
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VFD/Motor troubleshooting


Hi all,

I recently bought a VFD and motor for a project for school. I wired it up and the motor appeared to run at high speed but when I applied my load to the motor it just starts up and then peaks at about 60 rpms. As I understand it the VFD should be converting the voltage from single phase 120v to 3 phase 240v.

Here is the motor I bought
http://www.marathonelectric.com/MMPS...p?item=5K36JN2

the VFD
http://www.abb.com/product/seitp322/...78322&ajs=BuId

I changed the DIP switches on the VFD to 60hz and constant torque load.

Any ideas as to why it starts to spin and then peaks out at such a low speed?

Thanks,
RedSooner

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Old 04-16-2011, 12:52 PM   #2
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VFD/Motor troubleshooting


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Originally Posted by Redsooner View Post
Hi all,

I recently bought a VFD and motor for a project for school. I wired it up and the motor appeared to run at high speed but when I applied my load to the motor it just starts up and then peaks at about 60 rpms. As I understand it the VFD should be converting the voltage from single phase 120v to 3 phase 240v.

Here is the motor I bought
http://www.marathonelectric.com/MMPS...p?item=5K36JN2

the VFD
http://www.abb.com/product/seitp322/...78322&ajs=BuId

I changed the DIP switches on the VFD to 60hz and constant torque load.

Any ideas as to why it starts to spin and then peaks out at such a low speed?

Thanks,
RedSooner
Look at page 14 of the user manual for the dip switch settings. Make sure the load setting are correct.

#1 - 60 HZ
#2 - OFF
#3 - Constant Torque!!!!!
#4 - Ignore
#5 - Ignore
#6 - Off. This depends on the speed reference. "On" is for 4-20ma Only.
#7 - Off.
#8 - Off.

Next is your wiring connections. Tell me how you have this hooked up. Are you using a potentiometer?
Dip swith setting #3 must be in CT mode. If it's in VT mode, the problem you describe sounds about right.

Anyway. I need to know the answers before I can help you any further. Also, the user manual is provided for a reason.

Ps..........Why the 2 pole motor? 3600 RPM?

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Last edited by J. V.; 04-16-2011 at 12:56 PM.
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Old 04-16-2011, 01:17 PM   #3
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VFD/Motor troubleshooting


The dip switches match what you wrote. I did go through that owners manual several times trying to figure it out.

I have a heavy duty extension cord with one end cut that goes into the VFD. Then from the vfd I have a 4 wire cord that I plugged into the bottom of the VFD and then to the motor with connection for the low volts diagram (1-7,2-8,3-9 connected to the 3 lines and 4-5-6 wired together, then of course the ground). All the wire is pretty heavy gauge but I don't remember what gauge of the top of my head.

Yes I have a potentiometer from ABB. (on/off, fwd/revse, speed dial).

As far as the ps. This is for a little mockup of a larger design and I just needed the speed. But as you can probably tell I don't know much about motors, ect. so I might have bought the wrong size motor or vfd setup. I don't think its a load problem because it starts to spin from rest. I would think that is when it would need the most torque and after it starts spinning it should be able to ramp up to speed, even if it takes it a little while.

Last edited by Redsooner; 04-16-2011 at 01:25 PM.
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Old 04-16-2011, 02:00 PM   #4
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VFD/Motor troubleshooting


What are you trying to run at 3450 RPM?
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