KEB COMBIVERT F5 Applications Manual page 14

Escalator
Error/Message Alt.
(NUM)
Error Over EOP
Voltage (1)
14
/ Description
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
Cause/Solution/Troubleshoot
The DC bus voltage can be monitored in CP32.
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.