8.3.2 Maintenance Bypass Procedures
W A R N IN G ! If th e UP S system is co m po sed o f m o re th an 2 parallel UP S m o du les, an d th e lo ad
capacity exceeds th e sin gle m o du le capacity, do n o t u se th e in tern al m ain ten an ce bypass
switch .
This operation will make the load transfer from UPS power supply protection state to direct connection with AC input
bypass state.
CA UT IO N : P o wer su pply in terru ptio n can cau se dan ger o f th e lo ad
B efo re perfo rm in g th is pro cedu re, ch eck th e LED in fo rm atio n first, an d m ak e su re th e bypass is
n o rm al an d in verter syn ch ro n ized. O th erwise, it m ay resu lt in th e lo ad po wer in terru ptio n fo r a
wh ile.
1.
Manually turn off the inverter of each UPS in turn. The power flow diagram shows INVERTER OFF, and the
buzzer alarms. The load transfers to the static bypass, and the inverter shuts down. At last, all UPSs are
transferred to Bypass mode.
N O T E: P ressin g th e SILEN CE O F F bu tto n can silen ce th e alarm , bu t th e alarm m essage o n th e
to u ch screen do es n o t disappear u n til th e alarm statu s is cleared.
2.
Close the UPS external total maintenance bypass switches, and do not close the internal maintenance bypass
switch Q3 of each UPS.
3.
At this moment, the external total maintenance bypass should be parallel connected with each UPS's static
bypass.
4. At this moment, the touchscreen of each UPS displays ' Maint. Switch Closed'.
5.
Disconnect the output switch Q5 of each UPS in turn, and the maintenance bypass can supply power to the
load.
CA UT IO N : Lo ad is n o t secu red o n th e m ain ten an ce bypass an ym o re u n less th ere is po wer
gen erato r ru n n in g in stead o f n o rm al grid u tility.
6. Pressing the EPO button of each UPS stops the operation of rectifier, inverter, static switch and battery, but this
action will not affect the maintenance bypass to power the load normally.
N O T E: In m ain ten an ce m o de, th e lo ad is directly fed by th e m ain s po wer in stead o f th e pu re A C po wer
fro m th e in verter.
7.
Disconnect the rectifier input switch Q1 and bypass input switch Q2 of each UPS in turn.
At the moment, all the internal power supply is off and the touchscreen does not display any more.
8 Parallel System and LBS System
146
Vertiv™ Liebert® APM Plus User Manual
Summary of Contents for APM Plus 0500kMK16FN02000
Page 1: ...Vertiv Liebert APM Plus User Manual 50 500 kVA UPS...
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Page 34: ...2 Overview 26 This page intentionally left blank Vertiv Liebert APM Plus User Manual...
Page 45: ...Four switches 500 kVA 3 Mechanical Installation 37 Vertiv Liebert APM Plus User Manual...
Page 76: ...Figure 5 11 Customize the display 5 Touch Screen 68 Vertiv Liebert APM Plus User Manual...
Page 86: ...Figure 5 20 Enable module redundancy 5 Touch Screen 78 Vertiv Liebert APM Plus User Manual...
Page 91: ...Figure 5 24 Status Gauge setting options 5 Touch Screen 83 Vertiv Liebert APM Plus User Manual...
Page 92: ...5 Touch Screen 84 Vertiv Liebert APM Plus User Manual...
Page 94: ...5 Touch Screen 86 Vertiv Liebert APM Plus User Manual...
Page 95: ...Figure 5 26 Unit status Bypass details 5 Touch Screen 87 Vertiv Liebert APM Plus User Manual...
Page 96: ...Figure 5 27 Unit status Battery details 5 Touch Screen 88 Vertiv Liebert APM Plus User Manual...
Page 97: ...Figure 5 28 Unit status Load details 5 Touch Screen 89 Vertiv Liebert APM Plus User Manual...
Page 100: ...5 Touch Screen 92 Vertiv Liebert APM Plus User Manual...
Page 112: ...5 Touch Screen 104 This page intentionally left blank Vertiv Liebert APM Plus User Manual...
Page 184: ...12 Specifications 176 This page intentionally left blank Vertiv Liebert APM Plus User Manual...