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Fault and Bypass
indicator LEDs
and diagnostic
LED 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.
AC LED is
flashing.
UPS detected a line-to-
neutral reversal or a loss of
proper grounding;
continuous horn and UPS
will not start.This is active
only when power is first
applied to the input. Once
the UPS is running, the AC
LED will not start flashing,
even if the input wiring is
changed.
Contact a qualified
electrician to verify site
wiring.
Battery LED 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 LED 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 LED will flash, indicating
that the bypass is
unavailable.
Troubleshooting Guide (Continued)
Problem Cause Solution