Obsolete Industrial

What is a bad shunt error?


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What is a bad shunt error?
« on: March 30, 2016, 03:55:AM »
What does Bad Shunt Error mean?

What is a "Bad Shunt Error" in layman's terms? Can someone provide a basic explanation or definition of a Bad Shunt Error message and its possible causes. I'm looking for tips on troubleshooting this type of fault from the perspective of a maintenance tech. Thank you!

  • Bad Shunt Fault
  • Bad Shunt Error
  • Bad Shunt Alarm
  • Bad Shunt Message


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Re: What is a bad shunt error?
« Reply #1 on: April 22, 2016, 04:19:AM »
What is a bad shunt error?

Definition of bad shunt: This is an indication that the shunt circuit has failed. The shunt circuit provides a second path for current flow when the need arises due to demand or lack of demand.

In terms of motion control systems, servo drives, and motors. Shunt circuits are derived within the drive.Shunt circuits are comprised or resistors mainly to absorb excess current during motor braking or directional change.

 Abrupt changes in direction or speed can cause motor inertia to produce back currents that exceed the rating of the drive's capacitors. Hence the resistance intervenes and absorbs the current.

A bad shunt alarm can simply mean a failed resistor or circuit board. Sometimes the culprit can simply be burned wires. Most of the time you can use your eyes to track down your shunt problem.
(---The 3rd Shift Guy---)

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