Liebert UPS System user manual Service after Sales, Abnormal Fault Handling

Chapter 10 Service after Sales

Chapter 10 Service after Sales

10.1 Abnormal Fault Handling

If the UPS is abnormal without alarm indication, check according to Table 10-1.

Table 10-1 Fault handling

No.1	Fault description	Reason	Actions to be taken
	Utility switch is put to	A. Input power is
1	“ON”, no display by LCD,	disconnected from system	Check the input voltage
	no self test of system	B. Input under voltage
2	UPS has no output power	Output power cables are not	Check the output cables
	and no alarm	well connected
3	Abnormal sound and smell	UPS has internal fault	Contact the distributor

When the UPS is abnormal with visual/audible alarm, check the LCD display first and then process the fault according to Table10-2.

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