2.3 Parallel System
Up to four UPS modules can be parallel-connected to form a parallel system to increase the system capacity and reliability.
The load is equally shared between the paralleled UPS modules.
Moreover, two UPS modules or parallel system can comprise a dual bus system. Each parallel system has independent
output. Output synchronization is achieved through the LBS cable or LBS device, thus enabling seamless load transfer
between the two parallel systems or single modules through the STS device.
2.3.1 Parallel System Features
1.
The hardware and software of parallel system are completely the same as those of the single module. The
parallel system configuration is achieved through settings in configuration software.
2.
Parallel cables are connected in a ring, providing both system reliability and redundancy.
3.
The total load of the parallel system can be queried from each UPS module's touch screen.
2.3.2 Parallel System Requirements
A group of paralleled modules behave as one large UPS with the advantage of presenting higher reliability. To ensure that
all modules are equally utilized and to comply with relevant wiring rules, the following requirements apply:
1.
All UPS modules must be the same series, and connect to the same bypass source.
2.
The bypass and rectifier input sources must be connected to the same neutral line input terminal.
3.
Any RCD, if installed, must be of an appropriate setting and located upstream of the common neutral line input
terminal. Alternatively, the device must monitor the protective earth current of the system. Refer to Warning:
2.4 Operation Modes
The UPS has the following operation modes:
•
Normal mode
•
Battery mode
•
Automatic restart mode
•
Bypass mode
•
Maintenance mode
•
ECO mode
•
Frequency converter mode
•
Parallel redundancy mode
•
LBS mode
2 Overview
18
Vertiv™ Liebert® APM Plus User Manual
Summary of Contents for APM Plus 0500kMK16FN02000
Page 1: ...Vertiv Liebert APM Plus User Manual 50 500 kVA UPS...
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Page 45: ...Four switches 500 kVA 3 Mechanical Installation 37 Vertiv Liebert APM Plus User Manual...
Page 76: ...Figure 5 11 Customize the display 5 Touch Screen 68 Vertiv Liebert APM Plus User Manual...
Page 86: ...Figure 5 20 Enable module redundancy 5 Touch Screen 78 Vertiv Liebert APM Plus User Manual...
Page 91: ...Figure 5 24 Status Gauge setting options 5 Touch Screen 83 Vertiv Liebert APM Plus User Manual...
Page 92: ...5 Touch Screen 84 Vertiv Liebert APM Plus User Manual...
Page 94: ...5 Touch Screen 86 Vertiv Liebert APM Plus User Manual...
Page 95: ...Figure 5 26 Unit status Bypass details 5 Touch Screen 87 Vertiv Liebert APM Plus User Manual...
Page 96: ...Figure 5 27 Unit status Battery details 5 Touch Screen 88 Vertiv Liebert APM Plus User Manual...
Page 97: ...Figure 5 28 Unit status Load details 5 Touch Screen 89 Vertiv Liebert APM Plus User Manual...
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