KEB COMBIVERT F5 Operation Manual page 102

Drive Faults
Error/Message Alt.
(NUM)
Error Over Volt- EOP
age (1)
102
/ Description
The DC bus volt-
age rises above
the permissible
value either dur-
ing motor regen-
erative 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.
Cause/Solution/Troubleshoot
The DC bus voltage DG08 and the peak DC bus voltage
can be monitored in the Diagnostic screen #1 or DG08
and DG30. To reset the logged peak value, press the F4
Reset key from the Diagnostic Screen.
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 re-
gen unit at the ++ and - - terminals at both units.
Ensure the regen unit is regenerating properly, is
in regen status when it should be and there are 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.