2.6 Back feed Protection
Back feed protection device shields the bypass line from static switch failure. The UPS has no back feed device inside. It
should be installed externally by following methods.
• An external disconnect device, coil is energized by input voltage. When input AC Loss, it will open the contactor.
Figure 2.23 External Contactor
2.7 Connecting and Disconnecting Internal Battery Terminals (MTP 20-
40kVA)
During commissioning, the UPS is equipped with internal batteries (only valid for MTP 20-40kVA), it is required to connect
the internal batteries to the UPS terminals.
1. To do it, use the appropriate tools to open the top and side panels of the UPS.
2. Connect the battery blocks interconnection cables provided with the UPS (4 cables for MTP 20kVA, 8 cables for
MTP 40kVA).
3. While performing this operation, wear arc protective gloves and arc protective clothing.
26 Proprietary and Confidential ©2024 Vertiv Group Corp. 2 Installation and Operation
Vertiv™ Liebert® MTP Online UPS User Manual 20-40-80kVA
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