CA UT IO N : W h en th e UP S is in m ain ten an ce m o de, th e lo ad is n o t pro tected again st abn o rm al
m ain s su pply.
5.
Pressing the EPO button stops the operation of rectifier, inverter, static switch and battery, but this action will
not affect the maintenance bypass power the load normally.
N O T E: Un der 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.
6. Disconnect the rectifier input switch Q1, bypass input switch Q2, and output switch Q5.
At the moment, all the internal power supply is off and the TOUCH SCREEN does not display any more.
W A R N IN G !
1. If th e m ain ten an ce is requ ired, wait 10 m in u tes fo r th e in tern al DC bu s capacitan ce
disch argin g.
2. T h e parts o f UP S circu its also h ave h azardo u s vo ltage, th o u gh th e rectifier in pu t switch ,
bypass in pu t switch an d battery switch are disco n n ected. T h erefo re, th e UP S m ain ten an ce is
applicable to qu alified perso n n el o n ly.
3. F o r m o dels with o u t Q 1, Q 2 an d Q 5, wh en th e extern al in pu t switch is n o t disco n n ected, th ere
is a h azardo u s vo ltage in side th e UP S.
6.3.5 Transfer from Maintenance Mode to Normal Mode
The following procedures will transfer the maintenance bypass supply mode of the UPS to the normal mode.
1.
Close the output switch Q5, external power bypass switch, bypass input switch Q2, external power main switch
and rectifier input switch Q1 in turn.
Confirm that the TOUCHSCREEN is on and the UPS runs in Bypass mode.
2.
Disconnect the maintenance bypass switch Q3.
3.
Start the system according to steps 4 to 6 in Startup Procedures in Normal Mode.
Now the UPS runs in Normal mode.
W A R N IN G ! Yo u m u st start th e bypass first, an d th en disco n n ect th e m ain ten an ce bypass
switch ; o r it m ay cau se o u tpu t lo ad po wer failu re.
At the moment, the load has transferred to UPS normal mode.
6 Single UPS Operation Introduction
111
Vertiv™ Liebert® APM Plus User Manual
Summary of Contents for APM 0250kMK16FN02000
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Page 97: ...5 Operator Control and Display Panel 89 Vertiv Liebert APM Plus User Manual...
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