4. When the single module starts, close the BCB and then manually turn on the inverter.
Wait for few seconds after starting the inverter the UPS system, it connects with existing systems for parallel operation
automatically.
8.3.5 Procedures for completely powering down UPS
Complete UPS shutdown and load power OFF should follow the below procedure. All power switches, isolating switches and
breakers are disconnected, and then UPS no longer supplies power to the load.
CAUTION: In the powering down procedure of the UPS, the load power will be cut off.
1. Press the EPO button of each UPS to stop the operation of rectifier, inverter, static switch, and battery.
2. Disconnect the rectifier input switch Q1 and bypass input switch Q2 of each UPS that will close the internal
power supply and the touch screen display will stop functioning.
3. Disconnect the output switch Q5 of each UPS.
CAUTION: Place a notice at the AC input distribution (generally far away from the UPS) to alert that the UPS
maintenance is being performed.
CAUTION: Wait 10 minutes while the internal DC bus capacitance discharging. Then the UPS is completely
shutdown.
WARNING! Hazardous battery voltage. The battery terminals will have hazardous voltage even after the UPS
complete shutdown.
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 8.4 on the next page and Figure 8.5 on page151. The LBS system has high reliability and is applicable to the load with
multiple inputs. For single input load, a 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 Proprietary and Confidential ©2023 Vertiv Group Corp. 149
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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