Multi-DENCO Electrical Connections
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 87
7.2 Connecting mains power supply
7.2.1 Cable requirements
A suitable 3-phase mains supply (with earth and neutral) shall be available to connect
the unit (voltage and frequency must be according to the unit identification plate). The
mains power supply must be equipped with necessary protection devices; FläktGroup
recommends fuses should be of type D or equivalent.
7.2.2 Electrical protection requirements
The pre-fuse size should be determined on the basis of the wiring diagram or unit iden-
tification plate and must not exceed the size specified in the documents. For further
information contact your local sales office.
7.2.3 Cable connection
Connect the main power supply cable to the isolator provided within the unit. ALWAYS
refer to electric wiring diagram supplied with the unit.
If the unit is supplied with an "Automatic Transfer Switch (Dual Power Supply)", this will
be in a different location to the isolator.
7.2.4 Cable routing inside unit
– Multi-DENCO units are designed for cable entry from the BOTTOM of the unit.
– Secure any interconnecting cables within the unit and ensure that the cables cannot
make contact with the fan or any hot components.
– Do NOT remove any unused rubber glands or blanking plugs.
– Do NOT drill any holes in the top panels of ANY electrical cabinets.
– Cable routing must consider that some electrical panels can pivot on hinges.
NOTE!
When connecting the supply voltage, ensure correct phase rotation. If the rotation
direction is incorrect, an adjustment shall be performed by changing the phases
using the main connection of the unit. Change the phase sequence of the power
supply lines using a suitably qualified personnel.
Never change the wiring in the unit control cabinet.
NOTE!
If NO door interlocked isolator is fitted to the unit, a multi-core cable must be used
for unit power (to avoid cable breaks by the hinged cabinets) and a means of isola-
tion must be provided to meet country specific regulations. Always refer to local and
country specific electrical regulations when installing power supplies. A maximum
distance of 1 m from the unit is recommended.
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