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Armature Overvoltage


ram14375

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Hello Ram

 

Over voltage is generally due to an "overhauling" load. i.e. the load is driving the motor rather than the motor driving the load.

This must be a single quadrant drive?? A four quadrant drive would dump the excess back into the supply.

 

Best regards,

Mark.

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Hi ram

 

Using a four quadrant drive will overcome this.

Some drives allow you to add "braking" resistors that will absorb the extra energy.

 

Best regards,

Mark.

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Hi,

 

You may check the voltage feedback circuit, it may not sending the proportional feedback to the drive.Feedback circuit maybe derived from encoder, tacho generator or Armature voltage divider circuit, you may try to check also the voltage feedback "IR compensation circuit" (if fitted).

 

Most of our experience with over voltage fault is due to lost of voltage/speed feedback, voltage unstability maybe due to mechanical reason as well, i.e loose shaft coupling keys to encoder or tachogenerator.

 

Regards,

 

Gerry

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