LEGRAND Trimod HE 10, Installation And Maintenance Manual

Page: 22 / 60

22
All the electrical connection operations are carried out on the connection terminal strips inside the UPS. For the Trimod
HE 10, 15, 20, 30 TT models, it is necessary to unscrew the distribution drawer locking screws and pull it outward to get at
the distribution terminal strip. For the Trimod HE 30 TM, 40 and 60 models, it is necessary to remove both the lower panels
to get at the terminal distribution strip.
Outside the drawer there are the fuse breakers (depending on the model), the output switch, the mains input switch and
the manual maintenance bypass switch.
In the case of Trimod HE 30 TT, the fuse holders have been installed inside the terminal strip.
5.2.2 Preliminary operations
Before connecting the UPS, check that:
• the mains input voltage and frequency correspond with the values indicated in the technical data on the UPS rating plate;
• the earthing has been carried out in compliance with IEC (International Electrotechnical Commission) standards or local
regulations;
• the electrical system has been fitted with the necessary differential and thermal-magnetic protections upstream of the
UPS input.
5.2.3 Wiring
For all the models it is possible to pass the cables from the bottom into the opening in the base. It is also possible to pass
the cables through the metal plate with holes fixed on the rear panel through 4 screws. In this case it is essential to block
the cables by means of appropriate cable glands, not supplied, to be inserted into the holes in the plates. The plates have
four holes with a diameter of 33 mm and one hole with a diameter of 16 mm.
5.2.4 Earthing
Before carrying out any other installation operation, connect the earthing wiring coming from the low voltage switchgear
to the earthing terminal on the UPS terminal strip.
5.2.5 Protective devices
To ensure proper protection from overloads or output short-circuits, it is necessary to use adequate protection at the
electrical system level.
Install automatic residual-current and thermal-magnetic breakers upstream of the UPS on the input line, selected
according to the indications in the tables shown in chapter 11.
5.2.6 Backfeed protection
The Trimod HE UPS is fitted with an auxiliary contact for the actuation of the external backfeed protection (protection
against power transfer towards the input). This auxiliary contact has been created with a C/NC/NO relay and is available
on the the relative tripolar “BACKFEED PROTECTION” terminal on the terminal strip.
5. Installation