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Troubleshooting
38
Fault and Bypass indicators
and diagnostic indicator B are
illuminated.
UPS internal DC bus
overvoltage.
UPS requires service. Contact your local dealer, Liebert
representative or the Liebert Worldwide Support Group.
Fault and Bypass indicators
and diagnostic indicator E are
illuminated.
UPS inverter fault.
UPS requires service. Contact your local dealer, Liebert
Representative or the Liebert Worldwide Support Group.
Fault and Bypass indicators
and diagnostic indicators A
and B are illuminated.
Inverter-to-Inverter
Communications Failure
UPS requires service. Contact your local dealer, Liebert
Representative or the Liebert Worldwide Support Group.
Fault indicator and diagnostic
indicators A and C are
illuminated.
UPS failed the battery test.
Replace batteries. Contact your local dealer, Liebert
representative or the Liebert Worldwide Support Group.
Fault indicator and diagnostic
indicators A and D are
illuminated.
L1 to L2 phase angle
unacceptable.
Only phase angles of 120, 180 or 240 degrees (±10
degrees) are permitted. These must be compatible with
the selections in the configuration program.
Or the phase angle has changed while the UPS was
running. The phase angle is detected at startup and
cannot be changed to a different power source while
running.
Turn the UPS Off and wait until the fans stop. Apply input
AC power. The UPS will reprogram the phase angle to
match the utility, if the utility is 120, 180 or 240 degrees
between L1 and L2. If this does not resolve the issue,
contact a qualified electrician to verify the site wiring.
Fault indicator and diagnostic
indicators B and C are
illuminated.
REPO is currently activated.
UPS has shut down due to the REPO (Remote Emergency
Power Off). The output cannot be started by any method.
Fault indicator and diagnostic
indicators B and D are
illuminated.
UPS output is OFF from a
previous REPO command.
REPO is no longer activated.
UPS is OFF due to previous REPO (REPO is no longer
activated). Once utility power is restored, press the OFF
button twice within four seconds (to clear the alarm), then
press the ON button to start UPS (Auto-restart is NOT
possible).
Fault indicator and diagnostic
indicators C and E are
illuminated.
UPS shutdown due to a
command from the
communications port(s).
Your UPS has received a signal or command from the
attached computer. If this was inadvertent, ensure the
communication cable used is correct for your system. For
assistance, contact your local dealer, Liebert
representative or the Liebert Worldwide Support Group.
Fault indicator and diagnostic
indicators D and E are
illuminated.
UPS charger fault.
UPS requires service. Contact your local dealer, Liebert
Representative or the Liebert Worldwide Support Group.
AC Input indicator is On &
Battery indicator is flashing.
Battery source is not
available; continuous horn.
Check battery connections, completely power down and
restart UPS.
NOTE: If the battery circuit opens while the UPS is
running, it will be detected when the next battery test is
performed.
Bypass indicator is flashing.
Bypass voltage is present,
but is disabled for use
because the voltage or
frequency is outside
acceptable limits.
The AC input powers the PFC input and serves as the
bypass source. If the AC is present but the voltage or
frequency exceeds the acceptable range for safe
operation with a load, the bypass will be disabled and this
indicator will flash, indicating that the bypass is
unavailable.
Table 6 Troubleshooting guide
Problem Cause Solution