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Electrical installation
General specifications
CAUTION
All electrical connections to the machine must be carried out in compliance with laws and regu lations in force.
All installation, management and maintenance activities must be carried out by qualified personnel.
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 nearest manufacturer
office, who will send you a copy.
CAUTION
Only use copper conductors. Failure to use copper conductors could result in overheating or corrosion at connection
points and could damage the unit.
To avoid interference, all control wires must be connected separately from the power cables. Use different elect rical
passage ducts for this purpose.
CAUTION
Before servicing the machine in any way, open the general disconnecting switch on the machine’s m ain power supply.
When the machine is off but the disconnecting 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.
CAUTION
Contemporaneity of single-phase and three-phase loads and unbalance between phases could cause leakages towards
ground up to 150mA, during the normal operation of the units of the series.
If the unit includes devices that cause superior harmonics (like VFD and phase cut), the leakage towards ground could
increases to very higher values (about 2 Ampere).
The protections for the power supply system have to be designed according to the above mentioned values.
