Control Techniques Unidrive M200 Common Fault Codes – Part 1

Unidrive M Series Variable Frequency Drives from Control Techniques are designed specifically for industrial applications. Each Unidrive M model is tailor-made for application-specific purposes to deliver maximum value, flexibility or high performance.

The Unidrive M200 AC Drive is designed to be a flexible machine, integrated with state of the art communications technology for precision motor control. The drive is easy to use, with a high-performance open-loop motor control specification perfect for conveyors, fans, pumps and mixers – any application where functions are controlled remotely via fieldbus or Ethernet communications.

Because the M200 is such a valuable tool, it can be a headache when something goes wrong. With dozens of fault codes to parse and diagnose, it may be difficult to identify where your drive is encountering issues. To help you diagnose problems you’re having with the M200, we’ve composed this guide to give you a head start when troubleshooting your drive.

This is Part 1 in a five-part series.

 

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Overvoltage

This fault is identified as Trip 2, and “OV” will display on the drive’s keypad.

When the DC BUS voltage exceeds its peak or maximum continuous level for 15 seconds, the fault will trip. The trip threshold varies depending on the voltage of the drive.

Within the overvoltage fault specification, three sub-trip identifications exist:

  • Control system 00 0 01: Instantaneous trip when the DC bus voltage exceeds VM_DC_VOLTAGE[MAX].
  • Control system 00 0 02: Time delayed trip indicating that the DC bus voltage is above VM_DC_VOLTAGE_SET[MAX].
  • Power system 01 0 00: Instantaneous trip when the DC bus voltage exceeds VM_DC_VOLTAGE[MAX].

Recommended actions:

  • Increase deceleration ramp (Parameter 00.004)
  • Decrease the braking resistor value (must stay above the minimum value)
  • Check nominal AC supply level
  • Check for supply disturbances which could cause the DC BUS to rise
  • Check motor insulation using an insulation tester

 

Output Phase Loss

This fault is identified as Trip 98, and “Out.P” will display on the drive’s keypad.

The output phase loss trip indicates that phase loss has been detected at the drive’s output.

Within the output phase loss fault specification, four sub-trip identifications exist:

  • U phase detected as disconnected when drive was started
  • V phase detected as disconnected when drive was started
  • W phase detected as disconnected when drive was started
  • The drive output frequency is above 4 Hz and a phase is disconnected for the time specified by “Output Phase Loss Detection Time” (parameter 06.058)

NOTE: If parameter 05.042 = 1, the physical output phases are reversed, so sub-trip 3 refers to physical output phase V and sub-trip 2 refers to physical output phase W.

Recommended Actions:

  • Check motor and drive connections
  • To disable the trip set “Output Phase Loss Detection Enable” (parameter 06.059) to 0

 

Stay tuned for Part 2! For more information about the M200 or drive fault codes, contact our experts today!

 

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