Liebert Series 300 manual UPS System

Table 8	Alarm Messages (continued)
Alarm		Meaning and
Message		Corrective Action in Brackets [ ]
UPS SYSTEM
UPS output not synchronized to input		UPS inverter output is not synchronized with the input power. Automatic
power		transfers to the Static Bypass Line are prohibited. This is usually a temporary
		condition that is corrected automatically by the UPS internal control system.
Input power single phased		This message indicates an input power problem.
		[Check all input power phases.]
Input voltage sensor failed		Each input voltage phase has two sensors. One of these sensors has failed.
		[Contact Liebert Customer Service and Support.]
Inverter leg over current in X-phase		A fault has been detected in the inverter, caused by a UPS failure. The load
		has been automatically transferred to the Static Bypass Line. Power to the load
		is not being conditioned by the UPS.
		[Contact Liebert Customer Service and Support.]
Output undervoltage		UPS output voltage is below a specified minimum. The load has been
		automatically transferred to the Static Bypass Line. Power to the load is not
		being conditioned by the UPS. An automatic retransfer will be attempted when
		the output voltage is within tolerance.
		[Contact Liebert Customer Service and Support if this condition persists.]
Output overvoltage		UPS output voltage is above a specified maximum. The load has been
		automatically transferred to the Static Bypass Line. Power to the load is not
		being conditioned by the UPS. An automatic retransfer will be attempted when
		the output voltage is within tolerance.
		[Contact Liebert Customer Service and Support if this condition persists.]
Output overcurrent		An output overcurrent surge has been detected. The load has been
		automatically transferred to the Static Bypass Line. An automatic retransfer will
		be attempted when the output current returns to nominal.
		[Contact Liebert Customer Service and Support if this condition persists.]
System output overloaded		An overload condition is present. If the load is on the UPS inverter, the load will
		be automatically transferred to the Static Bypass Line if the overload exceeds
		the UPS Module capacity.
		[Determine cause of the overload and reduce the load.]
Load transferred to bypass due to		The load has been automatically transferred to the Static Bypass Line because
overload		of an overload condition.
		[Determine cause of the overload and reduce the load.]
System output overloaded		The overload condition is still present and must be reduced or it will soon
		exceed the capacity of the Static Bypass Line, resulting in loss of all power to
		the critical load. Power to the load is not being conditioned by the UPS.
		[Determine cause of the overload and reduce the load.]
System shutdown due to overload		An overload condition has exceeded the capacity of the Static Bypass Line.
		The UPS has been shut down, resulting in loss of power to the critical load.
		[Perform a UPS shutdown procedure. Correct the overload condition and
		perform a UPS start-up procedure.]
Control error		Automatic diagnostic testing has detected a failure (of hardware or software) in
		the UPS internal control system. A second message may indicate internal test
		or software timeout. The load has been automatically transferred to the Static
		Bypass Line. Power to the load is not being conditioned by the UPS.
		[Contact Liebert Customer Service and Support.]
Critical power supply failure		A failure has been detected in one of the low voltage power supplies. The load
		has been automatically transferred to the Static Bypass Line. Power to the load
		is not being conditioned by the UPS.
		[Contact Liebert Customer Service and Support.]
Load transferred due to internal		A failure has been detected in the UPS. More specific information may be
protection		available in a separate Alarm Message. The load has been automatically
		transferred to the Static Bypass Line (provided the power available on the
		bypass line is within specifications). Power to the load is not being conditioned
		by the UPS.
		[Contact Liebert Customer Service and Support.]

64 Operation