Liebert GXT 2U user manual Your UPS has received a

			Troubleshooting
Table 1	Troubleshooting guide (continued)
Problem		Cause	Solution
			Your UPS has received a
			signal or command from
			the attached computer. If
Fault and Bypass			this was inadvertent,
			ensure the communication
indicator LEDs		UPS shutdown due to a
			cable used is correct for
and diagnostic		command from the
			your system. For
LED C and E are		communications port(s).
			assistance, contact your
illuminated.
			local dealer, Liebert
			representative or the
			Liebert Worldwide Support
			Group.
		UPS detected a line-to-
		neutral reversal or a loss of
		proper grounding;
		continuous horn and UPS	Contact a qualified
AC LED is		will not start.This is active
		only when power is first	electrician to verify site
flashing.
		applied to the input. Once	wiring.
		the UPS is running, the AC
		LED will not start flashing,
		even if the input wiring is
		changed.
			Check battery connections,
			completely power down
			and restart UPS.
Battery LED is		Battery source is not	NOTE: If the battery circuit
flashing.		available; continuous horn.	opens while the UPS is
			running, it will be detected
			when the next battery test
			is performed.
			The AC input powers the
			PFC input and serves as
			the bypass source. If the
		Bypass voltage is present,	AC is present but the
Bypass LED is		but is disabled for use	voltage or frequency
		because the voltage or	exceeds the acceptable
flashing.
		frequency is outside	range for safe operation
		acceptable limits.	with a load, the bypass will
			be disabled and this LED
			will flash, indicating that the
			bypass is unavailable.

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