Tripp Lite SU20KX, SU80KX, SU40KX owner manual Manual Bypass Procedure Parallel UPS

9 – Start-Up, Shutdown and Bypass (continued)	1
9-10 Manual Bypass Procedure (Parallel UPS)
Warning: When the UPS system is in manual bypass, the inverter shuts down. Connected equipment loads are powered by the bypass	2
(reserve) power source and will not receive battery backup during a utility power failure.

•1 For the first UPS system you wish to shut down, press the OFF
	button A for 3 seconds (until you hear a beep), then release
	the button. If the other UPS system can support the connected
	equipment loads alone, the UPS system that was turned off will						3
	shut down its inverter and its LCD screen will read “LOAD NOT
	POWERED”. The other UPS system’s LCD screen will read
	“ONLINE MODE”. If the total connected equipment load is too
	large to be handled by a single UPS system, both UPS systems					A
	will shut down their inverters and switch to bypass mode, and their	1					4
	LCD screens will read “ON AUTO BYPASS”. Repeat step 1 for
	the second UPS system you wish to shut down.
•2	Switch off the main input circuit breaker switch Q1 of each UPS
	system.					Q1	5
			Output	Manual	Bypass	Main
		2		Bypass	Input	Input	6
•3	Confirm that both UPS systems are shut down, then switch on
	the manual bypass input circuit breaker switch Q3 of each UPS
	system. The bypass (reserve) power source will power the loads
	and the LCD screen will read “ON MANUAL BYPASS”.			Q3			7
			Output	Manual	Bypass	Main
		3		Bypass	Input	Input	8
•4	Switch off the bypass input circuit breaker switch Q2 and the
	output circuit breaker switch Q4 of each UPS system. The LCD
	screen will turn off completely.
			Q4		Q2		9
			Output	Manual	Bypass	Main
		4		Bypass	Input	Input
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•5 If the UPS systems have external battery cabinets connected,
	switch off the external battery cabinet circuit breaker switch A			A
	of each battery pack. On the SU20KX or SU40KX, turn OFF the
	battery breaker on the back of the UPS.
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		5
•6	In this mode, only the manual bypass path (including the manual						12
	bypass circuit breaker Q3 ), the load terminals of the output
	circuit breaker switch Q4 and the terminal block B contain					B
	hazardous voltage, allowing qualified service personnel to perform
		Q4	Q3
	maintenance or repair. Note: Qualified service personnel may
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	prefer to de-energize the UPS systems completely, depending on
	local codes and the nature of the maintenance or repair.
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