KEB COMBIVERT F5 Instruction Manual page 188

Diagnostics and Troubleshooting
Error/Message Description
E.UP
Error Under
Voltage
nE.OL2
no Error
Low Speed
Overload
nE.dOH
no Error Motor
Overheat
nE.OL
no Error
Overload
188
*Additional information at end of section
Cause/Solution/Troubleshoot
The DC bus Causes for under voltage include:
voltage drops
below the
permissible value.
For 460V drives,
the under voltage
level is 240VDC
and for 230V
drives, the under
voltage level is
216VDC.
The under voltage
level cannot be
adjusted.
If there is an issue with the DC bus voltage
measurement circuit:
Note: A 460V drive can operate on a 230V, single phase
power supply if programmed for UPS mode operation.
No more overload. Low speed overload has cleared and can be reset.
Over temperature Motor overheat sensor reset and Error Motor Overheat
reset possible can be reset.
No more overload. Overload counter has reached 0%, allowing motor to
cool and the error overload error may be reset.
Input voltage too low or unstable.
Verify input voltage and wiring. The DC bus
should measure approximately 1.41 x AC Input
phase-to-phase and should match the DC bus
measurement by the drive in the Diagnostics
Menu.
One phase of the line input is missing.
Line input phases are imbalanced. The phase-to-
phase voltage measurement should not exceed 2%.
Isolation transformer undersized or wired incorrectly.
Measure DC bus directly and verify against DC bus
voltage read from the Diagnostics screen. The DC
bus should be approximately 1.41xAC Input phase-to-
phase.