Emerson U/300/S/12P, U /400/S/12P, U/300/S/6P 1+N System Operating Instructions, Control Cables

Chapter 7 “1+N” System 53

7.2.5 Control Cables

Parallel Cable

Shielded and double insulated control cables available in length up to 20 meters must be must be interconnected in a ring configuration between UPS modules as shown in Figure 7-2. Specifically, connect the two parallel cables from X1-1 and X2-2 on the parallel board of the first module respectively to X1-2 and X2-1 on the parallel board of the second module, and so on.

The parallel board is mounted on the inner door of each UPS module. The ring configuration ensures high reliability of the control.

Parallel board

Parallel board

Parallel board

Parallel board

Parallel board

Parallel board

Figure 7-2 Connection of “1+N” system parallel cables

Emergency power off (EPO)

Refer to the EPO input port (X2) part in 3.3.1 Monitoring Board Ports.

Battery control

Refer to 3.3.2 Battery Control.

External bypass and output interlock

EXT-Maint (X3-1&2) on UPS parallel board M3 (leave open if no external bypass switch is used) provides external maintenance bypass interlock protection for the UPS. Short circuit means external bypass closed.

EXT-Out (X3-3&4) on UPS parallel board M3 (leave shorted if no external output switch is used) provides external output interlock protection for paralleled UPS modules. Short circuit means external output switch closed.

Note

UPS parallel board M3 is located behind protective covers accessible aftr opening the UPS front door — removal of this barrier requires the use of a tool and is restricted to service personnel.

Jumper JP1 (located next to X3) needs to be removed for X3: 3&4 to work properly.

7.3 “1+N” System Operating Instructions

Warning

If residual current detectors (RCDs) are used on UPS unit inputs, use a common device only on the system’s bypass mains. At the instant of electrical connection, the current may not be split instantaneously and this may cause the residual current circuit breakers (RCCBs) to trip separately.

These operations must be performed one at a time, progressing to the next step only after having completed the previous step on both UPS modules.

HIPULSE U UPS Single Module And “1+N” (Expandable) 160/200/300/400kVA User Manual