104
Drive Faults
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 volt-
age 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 volt-
age 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 Fail-
ure*
-
(160)
ESD input miss-
ing.
When an input programmed as ESD (Emergency Slow-
down) in LI04-11 is not present (high) at the beginning of
run. Refer to additional information at end of section.
ETS Input Fail-
ure*
-
(154)
ETS input miss-
ing.
When an input programmed as ETS (Emergency Ter-
minal 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.
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