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Troubleshooting
37
When reporting a UPS issue to Emerson, include the UPS model and serial number. These are on the
top panel of the Liebert
®
GXT3
™
.
Fault and Bypass indicators
and diagnostic C indicator are
illuminated
UPS DC/DC fault
UPS requires service. Contact your local dealer,
Emerson representative or Emerson Channel Support.
Fault indicator and diagnostic
D indicator are illuminated
UPS PFC (Power Factor
Correction Circuit) fault
UPS requires service. Contact your local dealer,
Emerson representative or Emerson Channel Support.
Fault and Bypass indicators
and diagnostic E indicator are
illuminated
UPS inverter fault
UPS requires service. Contact your local dealer,
Emerson representative or Emerson Channel Support.
Fault indicator and diagnostic
A and C indicators are
illuminated
UPS failed the battery test
Replace batteries. Contact your local dealer, Emerson
representative or Emerson Channel Support.
Fault and Bypass indicators
and diagnostic C and E
indicators are illuminated
UPS has been shut down by 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, Emerson
representative or Emerson Channel Support.
Fault indicator and diagnostic
A and B indicators are
illuminated
UPS failure (includes dual-fan
failure, single-fan failure under
certain conditions and battery
charger failure) and continuous
alarm
Ensure fan is not blocked up. If the fault is not removed,
contact your local dealer, Emerson representative or
Emerson Channel Support.
AC input indicator is flashing.
UPS detected a line-to-neutral
reversal or a loss of proper
grounding for UPS; continuous
horn and UPS cannot start up
in standby status. This is active
only when power is first
applied to the input. Once the
UPS is running, the AC input
indicator will flash, unless the
input wiring is correctly
changed.
Contact a qualified electrician to verify site wiring.
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.
Because the voltage or
frequency is outside
acceptable limits, the bypass is
disabled.
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 table (cont’d)
Problem Cause Solution