186
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Description Cause/Solution/Troubleshoot
E.OP
Error Over
Voltage
The DC bus
voltage rises
above the
permissible value
either during
motor regenerative
operation or as a
result of line side
voltage spikes.
For 460V drives,
the over voltage
level is 840VDC
and for 230V
drives, the over
voltage level is
400VDC.
The over voltage
level cannot be
adjusted.
The DC bus voltage LF.95 and the peak DC bus voltage
LF.96 can be monitored.
When using a braking resistor to dissipate regenerated
energy from overhauling or deceleration, the braking
resistor should come on at the following levels:
460V = 760VDC
230V = 380VDC
If a braking resistor is used:
Ensure proper connection of the braking resistor to
the to the braking transistor terminals PB, ++.
Disconnect braking resistor and measure resistance
to verify if correct.
If a line regen unit is used:
By default, the line regen unit will turn on at 103% of
the idle DC bus voltage.
Ensure proper connection between the drive and
regen unit at the ++ and - - terminals at both units.
Ensure the regen unit is regenerating properly
and is in the regen status when it should be
and there no faults on the regen unit preventing
operation.
If the over voltage is due to transient voltage spikes from
the line:
Install a 3-5% line reactor
If the over voltage is due to high line voltage:
Step-down down the line voltage with a transformer.
If there is an issue with the DC bus voltage
measurement circuit:
...continued on next page.
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