General Outline ESIE10-01
1–92 Part 1 – System Outline
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1.34 Electrical Installation
General
specifications
Caution:
Q All electrical connections to the machine must be carried out in compliance with laws and
regulations in force. All installation, operating and maintenance activities must be carried out by
qualified personnel. Please refer to the specific wiring diagram for the machine that you have
purchased and which was sent with the unit. Should the wiring diagram not appear on the machine
or should it have been lost, please contact your dealer who will provide for a copy to be forwarded.
Q Use copper conductors only. Failure to use copper conductors could cause overheating or
corrosion at the connection points and damage the unit. To avoid interference, all control wires
must be installed separately from the power wires. Use separate electrical conduits for this
purpose.
Q Before servicing the machine in any way, open the general disconnecting switch on the machine's
main power supply. When the machine is off but the disconnector switch is in the closed position,
unused circuits are live as well. Never open the terminal board box of the compressors before
having opened the unit's general disconnecting switch.
Q Series units are fitted with high power non-linear electrical components (VPD compressor supply).
These cause superior harmonics and can cause significant leakage towards ground (about 2 A).
The protection for the power supply system must be designed in accordance with the
above-mentioned values.
Q The short circuit current that can be withstood by the electrical board in accordance with
EN 60439-1, is 25 kA. Please therefore check the short-circuit current at the machine power supply
line connection terminals to ensure that it is less than or equal to the machine panel hold current.
Q In installations with power supply lines longer than 50 metres, inductive coupling between phases
and between phase and earth generates significant phenomena, namely:
• Unbalancing of phase currents
• Excessive voltage drop
In order to limit these phenomena, it is good practise to lay out the phase wires symmetrically, as
described in the figure.
Electrical
components
All power and interface electrical connections are specified in the wiring diagram that is shipped with
the machine. The installer must supply the following components:
Q Power supply wires (dedicated conduit).
Q Interconnection and interface wires (dedicated conduit).
Q Thermal-magnetic circuit breaker of suitable size (please see electrical data).
Electrical wiring Power circuit:
Connect the electrical power supply cables to the terminals of the general circuit breaker on the
machine's terminal board. The access panel must have a hole of appropriate diameter for the cable
used and its cable gland. A flexible conduit can also be used, containing the three power phases plus
earth. In any case, absolute protection against water penetrating through the connection point must
be ensured.
NO OK
Installation of long power supply wires
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