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Translation from original instructions
6.6 Electrical connections
All electrical operations must be carried out by personnel having the necessary legal requirements, and trained and infor
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med on the risks connected with these operations.
The sizing and characteristics of the power lines and relevant components must be determined by staff qualified to design
electrical systems, following the international and national regulations of the place of installation of the units in conformity
with the regulations in force at the time of installation.
To install components outside the unit, you must refer to the wiring diagram supplied with the unit.
The wiring diagram, along with the manuals, must be kept carefully and made available for future work on the unit.
Overview:
- The electrical connections must comply with the information shown in the wiring diagram attached to the unit and the
regulations in force in the place of installation.
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grounding is required by law;
- The installer must connect the earth cable to the PE terminal on the earth bar situated in the electrical control panel.
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Make sure the power supply voltage corresponds to the rated data of the unit (voltage, number of phases, frequency)
stated on the plate on the unit.
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the standard power supply voltage (see specific wiring diagram) must not fluctuate by more than ±10% and the unba
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lance between phases must always be less than 2%. If this does not occur, contact our technical department to choose
suitable protection devices.
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The standard supply voltage (see specific wiring diagram) must not fluctuate by more than ±10% and the unbalance
between phases must always be less than 2%.
- The control circuit power supply is taken from the power line via a transformer situated in the electrical control panel;
the control circuit is protected by fuses.
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Make sure the power line is correctly connected with a clockwise phase sequence.
In the electrical control panel, there is a phase sequence relay provided with two LEDs.
The green LED indicates the presence of the three-phase line.
The yellow LED indicates the correct phase sequence.
Fig. 18 Phase sequence relay
The contact of the phase sequence relay cuts off the 230 V power supply and therefore the controller will in
any case be powered, but the compressors will not get started.
