12
Escalator
Error/Message Alt. /
(NUM)
Description Cause/Solution/Troubleshoot
Error Over
Current
EOC
(4)
Occurs when the
speci ed peak
output current is
exceeded or if
there is a ground
fault.
Current can be monitored in CP30. If the error occurs
instantly at the start of each run, the issue may be:
Damaged motor contactor
Loose connection on power wiring
Ground fault or motor failure
Shorted output transistor in drive
Incorrect grounding or noise
Check:
Drive output, contactor and motor connections
Check/replace/bypass motor contactor
Disconnect motor leads from drive and run in open
loop (fault will occur instantly if shorted output
transistor).
Measure motor resistance
Error Overheat
Power Module
EOH
(8)
The heat sink
temperature
rises above the
permissible limit.
The heatsink temperature can be viewed in the inverter
parameter group, ru.38. The overheat limit is 90 degrees
Celsius for most drives. 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.
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 stand idle to
allow for the heatsink temperature to cool. If the
heatsink temperature read by the drive for the
diagnostics seems unreasonably high or the heatsink
is cool to the touch, then the heatsink temperature
sensor may be faulty and would need to be
repaired by KEB.
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