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What is the limitation to use smaller power rating motor with higher power rated VFD in ATV600/ATV900 series drives?

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Mark4
Cadet

What is the limitation to use smaller power rating motor with higher power rated VFD in ATV600/ATV900 series drives?

I found that 

The minimum possible motor power rating allowed with any of the ATV61/ATV71 VFD is 0.25 times of VFD's nominal power rating.
For example, ATV71HD30N4 (30KW VFD) ----> The smaller motor rating allowed is 0.25 x 30KW = 7.5KW motor.

 

Is this the same case for ATV600/ATV900 series drive?

3 Replies 3
BJacqz
Lieutenant Lieutenant
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225

Re: What is the limitation to use smaller power rating motor with higher power rated VFD in ATV600/ATV900 series drives?

In fact the limitation will be more on current. The minimum possible motor curent to set will correspond to 0.15 time "In" of the drive name plate (information given on installation manual, depending on your drive). You will then see the equivalent correponding motor power.

To be noted : when using a very small motor it could be necessary to disable the output phase loss protection (OPL) of drive, this avoiding output phase loss detection.

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ARHayward
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217

Re: What is the limitation to use smaller power rating motor with higher power rated VFD in ATV600/ATV900 series drives?

One other thing to note, when you are using a much smaller motor, the drive may not Auto-Tune. In fact, you may need to erase the Autotune [Autotuning] using [erase Autotuning] and also set the drive [Motor Control Type] Ctt to [U/F VC Quad.] UFq.

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BJacqz
Lieutenant Lieutenant
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198

Re: What is the limitation to use smaller power rating motor with higher power rated VFD in ATV600/ATV900 series drives?

In addition if ATV900 is used, prefer the motor control law uF5 as uFq does exist only on 600.

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