# Is this Variable frequency drive compatible with this motor?

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1. Nov 20, 2016

### belae1ka

My senior design adviser told me that the VFD must be the same brand as the motor that is being used, I'm not sure I believe this.

I plan on using a GS1 series AC drive, here is a link;

Here is a link to the motor;
https://www.mcmaster.com/#6136k671/=154ilst

What should I look for when looking for compatibility? HP, amps, single/three phase, input voltage?

Also, the amps at full load is rated at 0.8-0.8/0.4 Amps. I am confused with the formatting of this number, why is 0.8 divided by 0.4?

Thank you.

2. Nov 20, 2016

### wirenut

By the looks of it the vfds should work. The choice of which one depends on what input voltage you have available.
I would get one that can handle a higher hp(1/2 vs 1/4) if you can afford the difference.

As to the amperage listing it means 0.8A(@208V)-0.8A(@230V)/ {OR} /0.4A(@460V) depending on whether it is wired for low voltage (208v to 230v) or high (460v). The motor you linked to is a dual voltage motor.

To use this motor with the vfds you linked to it must be wired for low voltage.

{edit}The vfd does not need to be the same manufacturer as the motor.

3. Nov 20, 2016

### belae1ka

Thank you very much for your response! The shop that the VFD will be powered at has three phase outlets that are 250V 50Amps. Can I use these outlets to wire my VFD for the low voltage wiring (230V)? Or is the 250V too much voltage?

Thank you.

4. Nov 20, 2016

### wirenut

Is that 250v on the receptacle by the manufacturer? If so that is the rating of the receptacle, not the voltage available. Most receptacles are rated @125v, for single phase low voltage(phase to neutral);@250v for single or 3 phase low voltage (phase to phase); @277v for high voltage single phase (phase to neutral); @600v high voltage single and 3 phase (phase to phase).
The actual voltage available should be either on a label or actually measured.
As to the 50A rating you can use this if you protect your circuit with the proper fuses prior to the input of your vfd.

5. Nov 20, 2016

### Staff: Mentor

No. Most drive makers don't make motors and vice versa.
Inverter rated: No. So no, you do not want to use a VFD with this motor.

6. Nov 22, 2016

### belae1ka

The VFD I now plan on using is;
The DURApulse GS3 series AC drive (Model GS3-22P0): https://www.automationdirect.com/static/specs/gs3drives.pdf

It has a rated input current of 7.6Amps. The fuses available for this model come in "Fuse kit" pack of 3 that is to be installed in the drive. The fuse rating is 300V @ 25AMPS. Considering there are 3 fuses in each kit, is it safe to assume that the VFD will be ok? Is the current going into the VFD spead evenly across these 3 fuses?

Thank you

7. Nov 22, 2016

### belae1ka

Thank you so very much sir you could have singlehandedly saved my project

8. Nov 30, 2016

### Hiarum

Inverter optimized motors are not a requirement for useful VFD compatibility.

Long power runs being much more significant than insulation break down within the motor due to synthesized frequency profiles.