KEB COMBIVERT F5 Reference Manual page 286

Diagnostics and Troubleshooting
Error/Message Alt. /
(NUM)
Error Rotor (169)
Learn COM
Error Under EUP
Voltage (2)
ESD Input -
Failure* (160)
ETS Input -
Failure* (154)
Main Contact -
Failure* (150)
286
*Additional information at end of section
Description Cause/Solution/Troubleshoot
- When Error Rotor Learn Deviation occurs 10 times. Refer
to Error Rotor Learn Deviation Causes for additional
information.
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.
ESD input When an input programmed as ESD (Emergency
missing. Slowdown) in LI04-11 is not present (high) at the
beginning of run. Refer to additional information at end of
section.
ETS input When an input programmed as ETS (Emergency
missing. Terminal Slowdown) in LI04-11 is not present (high) at
the beginning of run. Refer to additional information at
end of section.
Motor contactor When an input programmed as Main Contactor Check in
not closed LI04-11 not present (high) at the beginning of run. Refer
to additional information at end of section.
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.