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INFOSEC UPS SYSTEM - 4, rue de la Rigotière - 44700 Orvault - FRANCE - www.infosec-ups.com
Hot Line – Tel + 33 (0)2 40 76 15 82 - Fax + 33 (0)2 40 94 29 51 - [email protected] – 03 11 AA AA 201 18
Fig.14.
Block diagram for the “Backfeed protection” application, for three phase input / three phase output configuration.
Mains three phase:
Connect the power supply cables N-R-S-T to the input terminals
(X4), (X1), (X2) and (X3), adhering to the
order of neutral and phases
indicated on the label of the device and in this manual. If the order of the
phases is not adhered to, the device will not operate.
When there are discrepancies between the labelling and the instructions of this manual, the label will always
prevail.
Independent static bypass line connection, terminals
4.3.2
Independent static bypass line connection, terminals (X14 to X17). Only in versions M4T-B.
As this is a device with class I protection against electric shocks, it is essential to install a protective
earth conductor (earth connection ( )). Connect the conductor to the terminal (X5), before connecting the
power supply to the UPS input.
In accordance with safety standard EN-IEC 62040-1, the installation has to be provided with a “Backfeed
protection” system, such as a contactor, which will prevent the appearance of voltage or dangerous energy
in the input mains during a mains fault (see figure 14 and comply with the wiring diagram of “Backfeed
protection” if the equipment has single or three phase input).
There can be no bypass in the line that goes from the “Backfeed protection” to the UPS, as this would
infringe on standard safety requirements.
Warning labels should be placed on all primary power switches installed in places that are not in the vicinity
of 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:
Before working on this circuit.
- Isolate the Uninterruptible Power Supply (UPS).
- Then check for Hazardous Voltage between all terminals including the protective earth.
Risk of Voltage Backfeed.
Connect the static bypass line cables to the respective terminals according to the configuration of the
available equipment.
Summary of Contents for M4T
Page 1: ...User Manual 10 80 kVA ...
