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5 Electrical Connection
Caution
Prior to commencing work, ensure that the
connection cables are de-energised and that it is
not possible to activate the power supply.
i
In order to avoid deformation of the supporting rail
and to protect the base of the connection terminal
against torsional forces, it is advisable to hold the
cable in position when tightening the clamping
screw.
The protective measure of earth connection serves to prevent
excessive touch voltage on freely accessible metal parts. The
PROTECT 1. is earthed by the provided earthing bolts ( /
PE). Prior to start-up, it must be ensured that the PROTECT 1.
is earthed in accordance with valid regulations, e.g. VDE 0100.
Before the connection work is carried out, check that:
♦ The values of the nominal voltage (input voltage) and
frequency match those on the nameplate of the UPS.
♦ The earth connection matches the prescribed IEC
standards or the local regulations,
♦ The UPS is connected to the electrical mains via a
separate supply line equipped with fuses on the supply-
side MI distribution.
♦ The power fuse in the MI distribution has the same or
higher value as the one indicated on the nameplate of
the UPS system.