socomec MASTERYS IP+ Installation And Operating Manual page 12

UNPACKING AND INSTALLATION
3
OF THE UNIT
3.4.1 Back-feed protection.
The UPS does not have an automatic protection device against current back-feed. The operator/installer must add a
warning label to all the mains power disconnecting switches installed at a distance from the UPS area. This serves to
remind technicians of the fact that the circuit is connected to a UPS (see the CAUTION section in paragraph 2 of this
manual and paragraph 4.5.3. of the EN62040-1-1 2003-11 standard). The label is supplied with the system.
The back-feed protection device may be built into the system (only on specifi c request), or an electromechanical
switch may be installed externally in the input of the UPS.
To install the external back-feed protection an external electromechanical switch should be installed as close as
possible to the UPS. For further information on the connection and the type of remote switch, please refer to
paragraph 11.7 of this manual.
ATTENTION.
The neutral is not disconnected as, even in the event of a single fault on the UPS, it never has high po-
tential when the mains and/or auxiliary power supplies are disconnected upstream. This is to prevent
transformation of the power source to the UPS every time there is a power failure.
Should the neutral potential be very high due to certain error conditions or due to installations
downstream (e.g. ground fault not detected and protected, high dispersion of a phase, or the IT
system), it will be necessary to install either devices that disconnect the Neutral or alternatively a
system that detects, signals and protects against high neutral/ground potential that could lead to
UPS failure.
NOTE.
The neutral of the AUX Mains line must be electrically common with the neutral of the main input feed
line.
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IOMMASIPXX07-GB 02
MASTERYS IP+
40-60 kVA 3/1