Sensorless Vector for 1/3 hp motor on VFD

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philly

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We are installing a 480V 1hp VFD on a 1/3hp screw conveyor. Is this an application where I should use the sensorless vector control on the drive for this motor?

If I understand correctly a constant torque load is an application where sensorless vector should be utilized on the drive. It seems to me that a screw conveyor is a constant torque load and therefore could be controlled in sensorless vector mode.

Does the fact that this motor is so small and the fact that the drive is larger than the motor not require that that sensorless vector control is used for this application?
 
No, V/HZ drive will work fine.

Sensor less vector is useful for when you need tight speed control or torque control, and you are too cheap for encoder feedback. If the V/HZ drive has slip I can't see a screw conveyor being precise enough that it would matter.
 
StephenSDH said:
No, V/HZ drive will work fine.

Sensor less vector is useful for when you need tight speed control or torque control, and you are too cheap for encoder feedback. If the V/HZ drive has slip I can't see a screw conveyor being precise enough that it would matter.
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Although I agree 100 %, you still have to be careful using that broad of a statement. I've seen screw conveyors that weigh out pills. Granted,it's a small and precise screw conveyor, a screw conveyor none the less.
 
mcclary's electrical said:
Although I agree 100 %, you still have to be careful using that broad of a statement. I've seen screw conveyors that weigh out pills. Granted,it's a small and precise screw conveyor, a screw conveyor none the less.
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Were they using a scale as the final measurement? I wouldn't rely on a screw conveyor for a validated system. If a screw conveyor did fit the application I would assume it is vector control.
 
If your VFD does not have Sensorless Vector mode, it probably isn't important enough to junk your drive and buy one that does. If your VFD has it, I would use it. It will not harm the motor and will give you better performance with minimal motor stress.
 
StephenSDH said:
Were they using a scale as the final measurement? I wouldn't rely on a screw conveyor for a validated system. If a screw conveyor did fit the application I would assume it is vector control.
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Yes, it was a loss in weight batching system that worked off of the scale counting down to a certain weight per batch.
 
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