Electrical connections
6
Electrical connections
The characteristics of the electrical lines must be determined by
specialized personnel, able to design electrical installations; moreover,
the lines must be in conformity with regulations in force.
The protection devices of the unit power line must be able to stop the
presumed short circuit current, whose value must be determined in
function of system features.
The power cables and the protection cable section must be defined in
accordance with the characteristics of the protections adopted.
All electrical operations should be performed by trained personnel
having the necessary requirements by the regulations in force, and being
informed about the risks relevant to these activities.
Operate in compliance with safety regulations in force.
6.1
Electrical data
The type plate reports the unit specific electrical data. The label it is
included in any electrical accessories.
The electrical data indicated in the technical bulletin and in the manual
refer to the standard unit, accessories excluded.
Refer to the electrical data report on the type plate:
• Tension;
• F.L.A.: full load ampere, absorbed current at maximum admitted
conditions;
• F.L.I.: full load input, full load power input at maximum admissible
condition;
Connections
▶ Refer to the unit electrical diagram;
▶ Verify that the network has characteristics conforming to the data
shown on the type plate;
▶ Before starting work, verify if the sectioning device at the start of the
unit power line is open, blocked and equipped with cartel warning;
▶ First, it is necessary to realize the earthing connections;
▶ Shelter the cables using adequate measure fairleads;
▶ Prevent dust, insects or rodents from entering the electrical panel as
they can damage components and cables;
▶ Use the special holes on the bottom of the frame for the power line
inlet. Seal any residual openings to prevent noise from escaping the
compressors compartment;
▶ Secure the cables: if left unattached they can be stripped;
▶ The cables must not touch the compressors or the refrigerant piping
(they reach high temperatures);
▶ Do not drill holes in the electrical panel. Alternatively, restore the IP
rating with watertight systems;
▶ Before power the unit, make sure that all the protections that were
removed during the electrical connection work have been restored.
56
Power supply cables
Do not overpass the maximum power allowed, which varies, according to
the type of signal.
Lay the cables far from power cables or cables having a different tension
and that are able to emit electromagnetic disturbances.
Do not lay the cable near devices which can generate electromagnetic
interferences.
Do not lay the cables parallel to other cables; cable crossings are
possible, only if laid at 90°.
In case of parallel power supply and signal cables, use separate metal
ducts. Minimum distance between power supply and signal cables:
• 300 mm for absorption up to 10A;
• 500 mm for absorption up to 50A;
Connect the screen to the ground, only if there aren't disturbances.
Guarantee the continuity of the screen during the entire extension of the
cable.
Respect imminence, capacity and attenuation of the indications.
CS AWP 16 - 24 CS AWP 31 - 41 CS AWP 53 - 59
Max. cable
16
section Cu
2
(mm
)
Table 42 Power supply cables section
Power supply netwok requirments
• The short circuit capacity of the line must be less than 15 kA;
• The units can only be connected to TN, TT distribution systems;
• Voltage 400-3-50 +/-10%;
• Phase unbalance < 2%;
• Harmonic distortion less than 12% (THDv<12%);
• Voltage interruptions lasting no longer than 3ms and with at least 1 s
between each one;
• Voltage dips not exceeding 20% of the RMS value, lasting no longer
than a single period (50Hz) and with at least 1 s between each dip;
• Earth cable as specified in the table:
Cross-section of the line
2
conductors (mm
)
S <= 16
16< S <= 35
S > 35
Table 43
25
25
Minimum cross-section of the
protective conductor (PE)
2
(mm
)
S
16
S/2
CS3000 AWP – 6721852570 (2022/11)