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1-4.
Connection Warnings
•
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. There is no standard backfeed protection
inside of the UPS. Please isolate the UPS before working according to Diagram 1. The isolation device
must be able to carry the UPS input current.
There can be no derivation in the line that goes 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 device
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:
-
Then check for Hazardous Voltage between all terminals including the
•
This UPS should be connected with TN earthing system.
•
The power supply for this unit must be single-phase rated in accordance with the equipment nameplate.
It also must be suitably grounded.
Diagram 1: External backfeed protection wiring
Before working on this circuit
-
Isolate Uninterruptible Power System (UPS)
protective earth.
Risk of Voltage Backfeed
HIGH LEAKAGE CURRENT
EARTH CONNECTION ESSENTIAL
BEFORE CONNECTING SUPPLY
WARNING
2
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