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C2
Characteristics of power supply
The AC power supply to the machine must meet the following conditions:
•
max. voltage variation ± 10%
•
max. frequency variation ± 1% continuous ± 2% for a short period.
Harmonic distorsion, unbalanced three-phase supply voltage, voltage pulses, interruption, dips and the other electric
characteristics must respect the provisions of point 4.3.2 of Standard EN 60204-1 (IEC 60204-1).
IMPORTANT!
The machine's power supply must be protected against overcurrents (short circuits and over-
loads) by fuses or suitable thermal magnetic circuit breakers.
These must be fitted on an omnipolar disconnection system having a contact gap of at least 3 mm.
IMPORTANT!
For protection against indirect contacts (depending on the type of supply provided for and con-
nection of earths to the equipotential protection circuit) refer to point 6.3.3 of EN 60204-1 (IEC
60204-1) with the use of protection devices that ensure automatic cut-off of the supply in case of
isolation fault in the TN or TT systems or, for IT systems, the use of isolation controllers or differ-
ential current protection devices to activate automatic power disconnection (an isolation control-
ler must be provided for indicating a possible first earth fault of a live part, unless a protection
device is supplied for switching off the power in case of a such a fault. This device must activate
an acoustic and/or visual signal which must continue for the entire duration of the fault).
For example: in a TT system, a differential switch with cut-in current (e.g. 30 mA) coordinated
with the earthing system of the building where the machine is located must be installed ahead of
the supply.
IMPORTANT!
Customers are requested to follow these instructions, otherwise the Manufacturer does not guar-
antee the machine for continuous operation and/or against faults.
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