Item Description Item Description
1 Bypass input 7 Inverter
2 Bypass input switch 8 Automatic inverter switch
3 Static switch 9 Output switch
4 Mains input 10 UPS output
5 Rectifier input switch 11 Battery
6 Rectifier 12 Battery charger/discharger
NOTE: If ECO mode is required, adjust the parameters through the touch screen.
The operation method of ECO mode is the same as the description in Single UPS Operation on page101. In normal mode, the
load is powered by the bypass, the touchscreen displays Bypass mode.
NOTE: In ECO mode, the load is not protected against mains distortion.
Parallel redundancy mode (system expansion)
For higher capacity or higher reliability, the outputs of multiple UPS modules can be programmed for directly paralleling. The
built in parallel controller in each UPS module ensures automatic load sharing. A parallel system can include up to four UPS
modules. For the operation principle diagram of the parallel redundancy mode, see Figure 8.1 on page144.
LBS mode
A dual bus system consists of 2 independent UPS systems, each containing one or more parallel UPS modules. The dual bus
system has high reliability and is applicable to the load with multiple inputs. For single input load, an STS can be installed to
power the load. For the operation principle diagram of the LBS mode, see Figure 8.4 on page150 and Figure 8.5 on page151.
Dynamic online mode
As shown in Figure 2.12 on the facing page, when the UPS is in dynamic online mode, except the maintenance bypass switch,
all other power switches and battery switches are turned ON. The load power is preferentially supplied by bypass to save
energy. When the load power supply is provided by bypass, the inverter is in the mode of quality compensation for the bypass
voltage. When the bypass voltage exceeds the normal range, the system will switch to the inverter output. In this mode, the
battery can still be charged through the charger normally.
18 Proprietary and Confidential ©2023 Vertiv Group Corp. 2 Overview
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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