KEB COMBIVERT F5, Reference Manual, Page: 286 / 349

286
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Alt. /
(NUM)
Description Cause/Solution/Troubleshoot
Error Rotor
Learn COM (169) - When Error Rotor Learn Deviation occurs 10 times. Refer
to Error Rotor Learn Deviation Causes for additional
information.
Error Under
Voltage EUP
(2) The DC bus
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.
Causes for under voltage include:
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.
If there is an issue with the DC bus voltage measurement
circuit:
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.
Note: A 460V drive can operate on a 230V, single phase
power supply if programmed for UPS mode operation.
ESD Input
Failure* -
(160) ESD input
missing. When an input programmed as ESD (Emergency
Slowdown) in LI04-11 is not present (high) at the
beginning of run. Refer to additional information at end of
section.
ETS Input
Failure* -
(154) ETS input
missing. When an input programmed as ETS (Emergency
Terminal Slowdown) in LI04-11 is not present (high) at
the beginning of run. Refer to additional information at
end of section.
Main Contact
Failure* -
(150) Motor contactor
not closed When an input programmed as Main Contactor Check in
LI04-11 not present (high) at the beginning of run. Refer
to additional information at end of section.