Emerson 208V, 10-30kVA installation manual 5.3.5Power Cables, Auxiliary Dry Contact Cables

Appendix

5.3.5Power Cables

Wiring of power cables is similar to that of single module system (See 2.1 - Power Cabling). The bypass sources of all modules should be the same, and the outputs should be connected altogether cor- rectly.

Power cables will be supplied by customer. Power cables to the UPS’s of the 1+N paralleling cabinet must be routed through either the top or bottom entry access of the UPS.

For systems using a parallel cabinet, see Figures 36 and 38 through 44 for power cable terminations.

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.

5.3.6Parallel Control Cables Parallel System Control Cables

Make the connections listed below on the parallel logic board (M3) inside the 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 23).

See Figure 25 for dry contacts control cable wiring diagram.

Figure 23 Connecting '1+N' 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

Auxiliary Dry Contact Cables

The external output breaker of each UPS must have Normally Open auxiliary contacts. These con- tacts must be wired to connector X3 on the Parallel Logic Board (M3). See Figure 24.

33