Liebert Series 600T manual Detection of Trouble, Torque Specifications Unless Otherwise Labeled

Table 4	Torque Specifications (Unless Otherwise Labeled)
				Nut and Bolt Combinations
		Bolt		Grade 2			Electrical Connections
				Standard			with Belleville Washers
		Shaft
		Size		Lb-in	N-m		Lb-in	N-m
		1/4		53	6.0		46	5.2
		5/16		107	12		60	6.8
		3/8		192	22		95	11
		1/2		428	48		256	29
Circuit Breakers With Compression Lugs					Terminal Block Compression Lugs
		(For Power Wiring)				(For Control Wiring)
Current					AWG Wire
			Lb-in	N-m	Size or		Lb-in	N-m
Rating					Range
400 - 1200			300	34	#22 - #14		3.5 to 5.3	0.4 to 0.6
Amps

4.4Detection of Trouble

There is no practical way to anticipate an impending malfunction. It is important that the operator check the instrument readings if abnormal equipment performance is suspected.

Items to check include:

1.Output voltage of all phases should be within 2% of normal voltage. Output currents on each phase should not normally differ by more than 20%. If a greater difference is noted, the load is unbalanced and corrective action should be taken to redistribute the load, if possible.

2.If the UPS has not operated on battery power during the last 10 hours, the batteries should require little charging current. Battery mimic should indicate normal DC voltage with the battery charge current no more than 31 Amperes.

3.Input current on each phase should be within 10% of the average input current.

4.Alarm messages indicate malfunction or impending malfunction. A daily check of the Operator Control Panel will help to provide an early detection of problems. Refer to Table 1 and Table 2 in 3.0 - Operation to interpret alarm messages.

5.Tracing a problem to a particular section is facilitated by alarm messages and the metered parameter indications. These are stored in the Status Reports and can be displayed at the Operator Control Panel or at an optional terminal. The Liebert Customer Service Engineer will also be familiar with test points inside the unit.

NOTE

If the UPS system has a blown fuse, the cause should be determined before you replace the fuse. Contact Liebert Global Services.

Maintenance 115

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