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.
CAU TIO N : The follow ing procedures w ill cut off the load pow er m akin g the load com pletely
pow er off.
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 touchscreen does not display any more.
3. Disconnect the output switch Q5 of each UPS.
W ARN ING ! P ost a label at the AC inp ut distribution (generally far aw ay from the UPS) to alert
that th e U PS m aintenance is being operated.
W ARN ING ! W ait 10 m inutes for the internal DC bu s capacitance d ischarging. T hen the UPS is
com pletely shut dow n.
W ARN ING ! H azardou s b attery voltage: The b attery term inals still have hazardous voltage
after the U P S is com pletely shutdow n.
8.4 LBS System
8.4.1 Cabinet Installation
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 page138. 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
136
Vertiv™ Liebert® APM Plus User Manual
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