10
A01-00134 Rev. A
CAUTION
Installation and wiring must be in accordance with the local electrical laws
and regulations.
1.4 Connection
WARNING
In accordance with safety standard, installation must include a Backfeed
Protection system, 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.
However, there are relays on the Input to cut-off line voltage while the
neutral is still connected to UPS.
Input Relay Diagram Input Relay Diagram for Dual-Input Model
•
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 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)
Check for Hazardous Voltage between all terminals including the protected earth.
Risk of Voltage Backfeed!