How to troubleshoot an Over Heating Fault (OHF) on an Altivar Process Drive.

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Issue:
OHF fault on an Altivar Process Drive.

Product Line:
Altivar Process Drive (ATV630, ATV930, ATV650, ATV950, ATV660, ATV960, ATV680, ATV980)

Environment:
All serial numbers for Altivar Process Drive

Cause:
The OHF fault trip when drive thermal state " THD” reaches 118%, and it can be reset when the drive thermal state is less than 90%.
Read THD to know the drive state. [Display] [Drive parameters] [Drive Therm State]

Resolution:
OHF - Over Heating Fault

IP21/IP55 (ATVx30 and ATVx50)

Check to make sure heatsink fans are running.
- If fans are not running check following:
  - Check Fan Management [Complete settings] [Maintenance] [Fan management]
    - Standard - Fan runs when drive is running (Default Setting)
    - Always - Fan runs when drive is powered on
    - Economy - Fan runs when necessary (According to drive thermal state)
      - When the drive thermal state (THD) or DC choke thermal state reach 70% the fan will start. The fan stops when THD is below 60% and DC choke thermal state is below 40%.
    - To test fan set to Always and see if it runs
  - Check fan ventilation for blockage
    - Remove fan carefully and make sure nothing obstructing the fan blades from rotating. (Document attached)
  - Apply necessary fan voltage to test fan and see if works.
    - Use external power supply to test fan if possible. Should use 24 vdc power supply.
    - If fan runs, fan is good and possible bad power board or other internal component in the drive. May need to further troubleshoot drive or replace it.
    - If fan does not run the fan is bad and would need to be replaced. List of fan part number below.

fan kits

Drive Systems (ATVx60 and ATVx80)

Check to make sure heatsink fans are running.
Check 48 V Supply Board
- Fan is power from Supply Board with 48 vdc coming in
- Supply Board is powered with 460 Vac input power

Fan Part Numbers:

VX5VPM001 - Fan Kit, Connection Cables
VX5XPM002 - DC-Supply for Fan
VX5VPM003 - Enclosure Door Fan
VX4XPMC1180N4 - Fan Supply Board

The same part numbers for all Drive Systems but the quantity needed maybe different.

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