Motive DELPHI ATDC Ex 2GD, Дополнение к руководству

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Manual Addendum DELPHI ATDC Ex 2GD
pag 4/20
REV.03
Ground connection must be done (with galvanized screw and spring washer supplied) inside the terminal box (fig.1)
and by using the screw on the frame (fig.2).
The section of the ground wire connected to the motor frame must have a minimum section of 4 mmq.
fig.1 fig.2
For correct tightening of the grounding screws, please refer to the table below.
M4 M5 M6 M8 M10 M12 M16
Nm 2 3,2 5 10 20 35 65
Use with converters
When Delphi-Ex motors are used with converters, in addition to the general selection criteria
(limit values: rated voltage <830V, peak voltage <2,2kV, voltage gradients <2,2kV/1µs), consideration should be
given the following points:
• Motors powered by inverter have a voltage (or current) which is not purely sinusoidal.
This leads to an increase in losses, vibration, noise, and a different temperature rise.
• Possibility of spikes is linked to the value of the converter power supply voltage and the length of the motor power
cable.
To limit the phenomenon, it’s advisable to use specific filters connected between the converter and the motor
(mandatory for motor power cables over 50 mt).
All Delphi-Ex motors are equipped as standard with a reinforcing Nomex film between phases to protect against the
voltage peaks.
• The correct grounding of the motor and the driven machine is very important to avoid voltage and stray currents in
the bearings.
To prevent the current circulation in the bearing if the motor it is not equipped with an insulated bearing, use a
proper filter to reduce the high frequency harmonic voltage above 50kHz.
• Motors with power from 110kW and up must be equipped with insulated bearing and the coupling must be
insulated.