182
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Description Cause/Solution/Troubleshoot
EOH
Error Overheat
Power Module
The heat sink
temperature
rises above the
permissible limit.
The heatsink temperature can be viewed in ru.38. The
overheat limit is 90 degrees Celsius for most drives
(See Technical Data for units 175HP and larger). Under
normal operation, the heatsink temperature should
usually be below 65 degrees Celsius.
Causes of inverter heatsink overheat include:
Insufficient cooling or ambient temperature too high
Verify operation of fans.
The fans are thermostatically controlled to come
on at about 45 degrees Celsius. To turn all fans
on high, US.37. Function Test can be set to Fans
On.
Make sure fans are not clogged.
Increase air ow around inverter or add cabinet
fans.
Faulty temperature sensor.
Power down the inverter or let it to stand idle
to allow for the heatsink temperature to cool. If
the heatsink temperature read by the drive for
the diagnostics seems unreasonably high for
a heatsink cool to the touch, then the heatsink
temperature sensor may be faulty and would need
to be repaired by KEB.
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