8.3.5 Procedures for Completely Powering Down UPS
Complete UPS shutdown and load power-off should follow this procedure. All power switches, isolating switches and
breakers are disconnected, and then UPS no longer supplies power to the load.
CA UT IO N : T h e fo llo win g pro cedu res will cu t o ff th e lo ad po wer, m ak in g th e lo ad co m pletely
po wer o ff.
1.
Pressing the EPO button of each UPS stops the operation of rectifier, inverter, static switch and battery.
2.
Disconnect the rectifier input switch Q1 and bypass input switch Q2 of each UPS. At the moment, all the internal
power supply is closed and the touch screen does not display any more.
3.
Disconnect the output switch Q5 of each UPS.
W A R N IN G !
1. P o st a label at th e A C in pu t distribu tio n (gen erally far away fro m th e UP S) to alert th at th e
UP S m ain ten an ce is bein g o perated.
2. W ait 10 m in u tes fo r th e in tern al DC bu s capacitan ce disch argin g. T h en th e UP S is co m pletely
sh u t do wn .
W A R N IN G ! Hazardo u s battery vo ltage
T h e battery term in als still h ave h azardo u s vo ltage after th e UP S co m plete sh u tdo wn .
8.4 LBS System
8.4.1 Cabinet Installation
An LBS system consists of two independent UPS systems, each containing one or more parallel UPS modules, as shown in
Figure 8.5 on the next page and Figure 8.6 on page 143. The LBS system has high reliability and is applicable to the load
with multiple inputs. For single-input load, an STS can be installed to feed power to the load.
The system uses the LBS cables to keep the output of two independent UPS systems in synchronization. One set of UPS
system (single/parallel) is designated as the master, the other set of UPS system (single/parallel) is designated as the slave
for the operation in LBS mode.
8 Parallel System and LBS System
141
Vertiv™ Liebert® APM Plus User Manual
Summary of Contents for APM 0250kMK16FN02000
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