UPS Interconnection Kits

Appendix A.1.2 DC Power Connections

The DC power connections to the Liebert FS are made through the circuit breaker (see Figure 96) in the UPS interconnection kit installed in your Liebert FS. The maximum wire size for the circuit breaker terminals is 350MCM - 600VDC (approximate metric equivalent: 150mm2 wire section). Wire size and installation must comply with all applicable local, regional and national regulations (e.g., National Electric Code for USA).

Figure 96 Circuit breaker

Liebert FS

Positive

Terminal

Liebert FS

Negative

Terminal

The Liebert FS cabinet is configured for top entry cables in standard configuration. The cables can also be run through the side panels. The Liebert FS cabinet does not accommodate bottom entry cables.

The connection of the circuit breaker is described in Figure 135 - Elevation drawing—Liebert FS cabinet with integrated circuit breaker. Refer to this drawing to ensure that the adequate con- nections are performed.

Circuit Breaker Torque

Tighten the positive and negative terminals of the DC power connections on the circuit breaker to 250 in-lb. (29 N-m) unless the equipment is labeled with a different torque value.

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Emerson 540VDC manual Appendix A.1.2 DC Power Connections, Circuit Breaker Torque, Liebert FS Positive Terminal Negative