Liebert 1000kVA manual System Shutdown, Refer to 3.3.10 Maintenance Bypass

Operation

3.3.9System Shutdown

Perform a System Shutdown procedure when you must disconnect the UPS system components from all power sources when required for maintenance procedures.

Use the Shutdown Procedures screen when performing a manual System Shutdown. Refer to 3.4.5 - Shutdown Procedures.

Refer to 3.3.10 - Maintenance Bypass.

Before performing any maintenance on your Liebert Series 610 UPS System, observe ALL of the WARNINGS in 4.0 - Maintenance.

! WARNING

Lethal voltages are present within this system even when it is not on or when power is not being supplied. Observe all cautions and warnings in this manual. Failure to do so could result in serious injury or death. Do not work on or operate this equipment unless you are fully qualified to do so! Never work alone.

Figure 61 System shutdown

		RIB			RIB			RIB		BFB
UPS #3			UPS #2			UPS		#1
CB1			CB1			CB1
								SBS
										BIB
	R			R			R		SBB
	I			I			I				MBB
								System
CB2			CB2			CB2				SKRU
								Controls

Output

MIB

					SCCT
					To Critical Load
	MBD		MBD		MBD
					SCCT
Battery		Battery		Battery
					(can accommodate up to 6 UPS modules)

3.3.10Maintenance Bypass

Maintenance Bypass switchgear (cabinet, panelboard, switchboard or custom switchgear) allows you to totally isolate the UPS system from all power sources, while you maintain power to the critical load.

Your installation may have a two-breaker, three-breaker or four-breaker maintenance bypass or none at all. The main differences are the locations of the Rectifier Input Breaker and the Bypass Input Breaker (BIB).

Another option that may be present at your site is an alternate power source (generator) and an auto- matic transfer switch (ATS).

Note that to totally isolate the UPS system from all power sources, the Main Input switchgear and battery circuit breakers must also be opened

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