Emerson 40-200KVA user manual Cabinet Installation, Preliminary Checks, Power Cables

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5.3.2Cabinet Installation

Parallel system composed of two or more UPS modules using parallel cabinet

The UPS modules that will form the parallel system should be placed side-by-side. Each battery cabinet is placed next to its corresponding UPS module.

The parallel cabinet should be placed in the middle of the system.

5.3.3Preliminary Checks

Each UPS module should have the same firmware and the same hardware version. Refer to the instructions in 5.3.1 - Conditions for Parallel System.

5.3.4Power Cables

Wiring of power cables is similar to that of a single module system (See 3.1 - Power Cabling). The bypass sources of all modules should be the same, and the outputs should be connected altogether correctly.

Power cables are field-supplied. Power cables to the UPS’s of the paralleling cabinet must be routed through either the top or bottom entry access of the UPS.

NOTE

The system input and/or output circuit breaker is to be field-supplied. See Table 8 for current rating.

NOTE

The length and specifications of power cables including the bypass input cables and UPS output cables should be the same, thus the load can be shared evenly in bypass mode.

5.3.5Parallel Control Cables Parallel System Control Cables

Make the connections listed below on the parallel logic board (M3) inside the Liebert NX. (See Figure 30 for the location of the parallel logic board):

Shielded and double-insulated control cables, available in lengths of up to 100 feet (30m), must be interconnected in a ring configuration between UPS modules as shown below. The ring configuration ensures high reliability of the control (refer to Figure 17).

Figure 17 Connecting system parallel control cables

1		2	UPS	3			4
Parallel Board		Parallel Board		Parallel Board		Parallel Board
X3	P5	X3	P5	X3	P5	X3		P5
	X4		X4		X4			X4
X2-2	X2-1	X2-2	X2-1	X2-2	X2-1	X2-2		X2-1
								Interconnecting
P2		P2		P2		P2		Cables
	P1		P1		P1			P1
X1-1 X1-2		X1-1 X1-2		X1-1 X1-2		X1-1 X1-2
P3	P4	P3	P4	P3	P4	P3		P4
				33