Liebert 1000kVA manual Load Transfer Procedures, Manual Transfer Instructions UPS Lead

Operation

3.4.3Load Transfer Procedures

Use the Monitor/Mimic Display at the SCC to determine the operating condition of the UPS system. Press the Alarm Reset pad to clear the Alarm Messages. If all UPS modules are on-line, the only message remaining should be Load On Bypass. Refer to Table 9 for an explanation of any other remaining alarm messages. Call Liebert Global Services if you cannot clear any remaining alarm messages.

If the only alarm message displayed is Load On Bypass (or no alarms), you can perform a manual transfer of the load between the UPS system and the UPS bypass line. Changing the load from the UPS system to the UPS bypass is called a transfer. Changing the load from UPS bypass to the UPS system is called a retransfer. Note that the UPS system control logic can initiate automatic load transfers and retransfers. Refer to 3.5 - Automatic Operations.

Press the Select pad to display the Master Menu on the LCD of the SCC. Move the highlighted cursor to Load Transfer Procedures (using the Up and Down pads). Press the Select pad to display the Load Transfer Procedures screen.

Step 1. Verify that the OK TO TRANSFER message is highlighted. If not (if the TRANSFER PRO- HIBIT message is highlighted instead), slowly rotate the Voltage Adjust knob (Figure 10, item 6) to match the UPS system voltage to the bypass voltage.

NOTE

1. UPS output voltage changes VERY slowly in response to movements of the Voltage Adjust knob. To avoid overshooting, allow at least a minute for UPS output voltage to stabilize before proceeding to the next step.

2.If the TRANSFER PROHIBIT message remains, refer to Table 9 for corrective action for any alarm messages. Call Liebert Global Services if you cannot solve the problem.

Figure 66 Load transfer procedures screen

	SELECT : MASTER MENU
		VOLTAGE COMPARISON						SYNCHRONIZATION
			A-B	B-C	C-A	FREQUENCY	-30	0	+30
UPS		-	380	380	380	50.0 Hz
BYPASS		-	381	380	379	50.0 Hz

ON BYPASS

OK TO TRANSFER

TRANSFER PROHIBIT

MANUAL
TRANSFER INSTRUCTIONS UPS LEAD	= 2 Deg

1.AdjustthetheUPSvoltageuntilitl equalsitthethe bypasssvoltagevoltagewithwiththetheVOLTAGEVOLTAGEADJUSTADJUSTpotpot. .

2.IfIftheOKTOTOTRANSFERmessageis ishighlighted, simultaneouslypresspressthetheUPSBYPASSand CONTROLand CONTROLENABLENABLE buttons.

buttons.

3.Verifythatthethetransferwaswassuccessfulbybycheckingthethe breakerbreakerstatusatusononthethe"MONITOR/MIMIC"IMIC"screenscreen. .

4.PresssthetheALARMRESETbuttontoclearclearalarmsalarmswhichich

arearenonolongeractiveactive.

Step 2. Perform Step 2 on the Load Transfer Procedures Screen.

a.If the load is on internal bypass, simultaneously press the UPS and Control Enable pads (Figure 10). This will close the motorized UPS Output circuit breaker and open the motorized System Bypass circuit breaker (SBB) in a make-before-break sequence.

b.If the load is on the UPS system, simultaneously press the Bypass and Control Enable pads (Figure 10). This will close the motorized System Bypass circuit breaker (SBB) and open the motorized UPS Output circuit breaker in a make-before-break sequence.

Return to the Monitor/Mimic Display screen to monitor the operation of the UPS system. Press the Alarm Reset pad to clear any latched alarm messages removed by the new load status. Refer to Table 9 if an alarm message other than Load On Bypass is still displayed. Contact Liebert Global Services if you require assistance.

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