Emerson GXT2-PP20KRT208 Compatibility, Redundancy Design, Maintenance Bypass, System Description

System Description

2.0SYSTEM DESCRIPTION

2.1Compatibility

The Liebert GXT2-PP20KRT208 parallel POD is compatible only with the Liebert GXT2-10000RT208 UPS. No more than three Liebert GXT2-10000RT208 UPSs can be connected to the parallel POD.

2.2Redundancy Design

During normal operation with parallel connection of three Liebert GXT2-10000RT208 UPSs, the par- allel POD supplies 20kVA of output power plus redundancy of one 10kVA UPS. With the Liebert GXT2-PP20KRT208 N+1 redundancy design, the failure of one UPS will not affect the functioning of the overall system.

2.3Maintenance Bypass

When the UPS system must be completely shut down, maintenance bypass allows the parallel POD to work in the normal operation without interrupting power to the load. As shown in Figure 1, the Lie- bert GXT2-PP20KRT208 provides an alternate path for utility power to the connected load. In the event that the UPS experiences a failure, the UPS battery runs out or any other condition occurs requiring maintenance on the UPS, the user may manually transfer the connected load from the inverter to bypass by switching the maintenance bypass breaker to the On position.

Figure 1 Paralleling system block diagram

Utility

Branch Breaker

Terminal Block

of POD

(Main Input )

Input Breaker

Input Breaker

Input Breaker

UPS1 UPS2 UPS3

Output Breaker Output Breaker Output Breaker

Parallel Signal

Board

Terminal Block
of POD
(Output)	Optional POD
O/P Breaker

Load

4