Vertiv Liebert APM2 - External Protective Device; Power Cable

Figure 8.5 LBS System (Parallel System)
Item Description Item Description
1 Rectifier 7 Q3
2 Bypass 8 Q5
3 UPS1 9 Parallel cable
4 UPS4 10 LBS
5 Q1 11 STS
6 Q2 12 To load
NOTE: Q1, Q2, and Q5 are optional while Q3 is standard.
NOTE: In a dual bus system, the two UPS systems must have the same voltage and frequency, and the load should not
exceed the power rating of a UPS module system.
8.4.2 External protective device
Refer to External protective devices on page35.
8.4.3 Power cable
The power cable of dual bus power system is similar to that of single system. See the Wiring of Power Cable on page33.
The bypass and rectifier input supplies must use the same neutral line input terminal. If the input has a current leakage
protective device, the device should be installed with upstream of the neutral line input terminal.
8 Parallel System and LBS System Proprietary and Confidential ©2023 Vertiv Group Corp. 151
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual