ENGLISH
IOMMASIPXX09-GB 04
13
10-40 kVA
MASTERYS IP+
3
UNPACKING AND INSTALLATION
OF THE UNIT
The UPS is designed for transitory overvoltages in category II installations. If the UPS is part of
the building’s electric circuit or if it is likely to be subject to transitory overvoltages in category III
installations, further external protection must be provided, either on the UPS or in the AC power
supply network to the UPS.
In the event of three-phase non-linear loads connected in output, the current on the neutral
conductor may have a value that is 1.5 - 2 times the phase value (also for the input bypass). In this
case, size the neutral cables and the input/output protection properly.
3.5.1 Back-feed protection.
Since the UPS does not have an internal automatic protection device against current back-feed, the operator/install-
er must add a warning label to all the mains power disconnecting switches installed at a distance from the UPS area.
This is a reminder for the technicians about 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 standard). The label is supplied with the system.
To install the external back-feed protection it is necessary to connect an external electromechanical switch. For
further information on the connection and the type of remote switch, please read paragraph 11.6 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 poten-
tial when the mains and/or auxiliary power supplies are disconnected upstream. This is to avoid modi ca-
tions of the electrical system in case of a power failure.
If, in certain anomaly states, or because of the installation upstream (e.g. undetected and protec-
ted earth fault, or high leakage in a phase, or with IT systems) there is a hazardous potential on
neutral, a suitable isolating switch must be provided on the neutral as well, or else there must be
a detection, signalling and protection system.
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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