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5.3 Mains Connection
5.3.1 Preparation for the three-phase mains connection
Before connection work is performed on the UPS, make sure
that:
♦ The values of the nominal voltage (supply) and frequency
match those on the nameplate of the UPS.
♦ The earth connection matches the prescribed IEC
standards or the local regulations,
♦ The UPS can be connected to the electrical mains via a
separate supply line equipped with fuses in the supply-
side MI distribution.
♦ Back-up fuses or line safety switches are used that
correspond to the values listed in chapter 5.2.2.
♦ The connection cable from the back-up fuse to the UPS
is configured with a minimum cross-section acc. to
chapter 5.2.2 “Connection Cross-Sections and Fuse
Protection”.
The UPS can be live, and the voltage can be
dangerous. The unit may only be installed and
if necessary opened by trained and qualified
personnel. Repairs may only be carried out by
qualified customer service staff!
5.3.2 Connection of the Three-Phase Input Mains Voltage
In order to ensure the safety of personnel during installation
work, make sure that the connections are made under the
following conditions:
♦ No mains voltage present.
♦ The loads are switched off.
♦ The PROTECT 1. is switched off (display completely
blank).
To disconnect the PROTECT 1, carry out the following steps as
well:
♦ Place the “maintenance switch” manual bypass on the back
of the UPS in the “bypass” position. To do this, first remove
the 4 screws of the cover (no.
3, p. 27/28).