Input relay diagram Input relay diagram for dual-input model
• 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 or 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《Backfeed
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 «Backfeed
Protection» depending if the equipment is with signal or three phase input).
There shouldn’t be a spur circuit from the «Backfeed 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:
Before working on this circuit
- Isolate Uninterruptible Power Supply (UPS)
- Then check for Hazardous Voltage between all terminals including the protected earth
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