Figure 1.1 Input Relay Diagram
Figure 1.2 Input Relay Diagram for Dual-input Mode
This UPS should be connected with TN grounding/earthing system.
The power input for this unit must be three-phase rated in accordance with the equipment nameplate. It also must be suitably
grounded.
Use of this equipment in medical instrument of any life sustaining equipment where failure of this equipment can reasonably
be expected to cause the failure of the life sustaining equipment or to significantly affect its safety or effectiveness is not
recommended. Do not use this equipment in the presence of a flammable mixture with air, oxygen, or nitrous oxide.
Connect grounding terminal of UPS to a grounding electrode conductor.
In accordance with safety standard EN-IEC 62040-1, installation has to be provided with a back feed protection system, as for
example a contactor, which will prevent the appearance of voltage or dangerous energy in the input mains during a mains
fault (respect the wiring diagram of back feed protection depending if the equipment is with single or three-phase input).
NOTE: There can be no derivation in the line that goes from the back feed protection to the UPS, as the standard
safety would be infringed.
Warning labels should be placed on all primary power switches installed in places away from the unit to alert the electrical
maintenance personnel of the presence of a UPS in the circuit. The label will bear the following or an equivalent text:
4 Proprietary and Confidential ©2024 Vertiv Group Corp. 1 Important Safety Instructions
Vertiv™ Liebert® MTP Online UPS User Manual 20-40-80kVA
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