98
Drive Faults
Error/Message Alt. /
(NUM)
Description Cause/Solution/Troubleshoot
Error Overheat
Power Module
EOH
(8)
The heat sink
temperature rises
above the permis-
sible limit.
The heatsink temperature can be viewed in Diagnostics
Screen #7 or DG37. The overheat limit is 90 degrees Cel-
sius for most drives (See Technical Data for units 175HP
and larger). Under normal operation, the heatsink tem-
perature 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, LX06 Function Test can be set to Fans
On.
Make sure fans are not clogged.
Increase airow around inverter or add cabinet fans.
Faulty temperature sensor.
Power down the inverter or let it stand idle to allow
for the heatsink temperature to cool. If the heatsink
temperature read by the drive 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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