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Control circuit interlocking
It is imperative to always check the wiring diagram before completing the connections: In the electrical panel are some cables and
terminals, indicated in orange, that remain powered even with the power disconnector open (circuits excluded).
In order for the guarantee to be valid:
the unit input connectors (remote ON/OFF, fire-fighting, etc.) must be clean and single contacts for each unit (never make
a parallel connection to more than one machine with a single enable).
Below is an example of correct and incorrect connection.
CORRECT CONNECTION
It is advisable to keep the power cables separate from the control cables. Otherwise, screened cables should be used. To make
serial connections, use only screened cables with characteristic impedance of 120 ohm. The maximum length of the cable that
connects safety devices to the farthest away unit must not exceed 1000 metres. Input voltage phase difference.
Do not operate the unit when the voltage phase difference is greater than 2%. Use the following formula to check:
Example: rated mains voltage 400 - 3 - 50
AB = 409 V; BC = 398 V; AC 396 V
average voltage = (409 + 398 + 396) / 3 = 401 V
INFORMATION:
If the mains voltage has a phase difference greater than 2%, contact the electricity company. If the unit is
operated with a voltage phase difference of more than 2% THE GUARANTEE SHALL BE CONSIDERED
NULL AND VOID.
Before starting up the unit, it is advisable to check that electrical systems have been implemented to
guarantee conformity with the Electromagnetic Compatibility Directive (2014/30/EU).
Max voltage difference from the average
% �������������������� =
�������������� ��������������
(409 − 401)
% �������������������� =
INCORRECT CONNECTION
∗ 100
∗ 100 = 1.99
401
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