GT3000 Installation
108 IMGT30017EN
A2.4 MOTOR CABLE
A2.4.1 Connection cables between inverter and motors
NOTE: The power motor cables must be shielded.
If they are not shielded RFI or EMI problems may arise.)
Shielded cables assure a greater immunity of other users of the plant against the noise generated by the drive and they returns high frequency current
directly to the drive through the shielding instead of the current flowing through the motor frame.
The cable shield must be continuous and must be connected to ground at both ends, both to the ground terminal of the motor, and to the cabinet
output terminal, connected at its turn to ground bars.
In general, always foresee the use of a dedicated cable – with minimum section of 50% of the phases – connecting directly the terminal PE of the
drive with the corresponding terminal of the motor. This cable has the function of supplying a preferential way of closure to bring back to the drive the
noises created by the same avoiding to spread them to the plant ground system.
The motor protection connection must be performed locally with the plant ground system.
Motor TB
Figure A2.5.4
Typical connection on the motor
U
V
W
CABLE
SHIELD
A2.4.2 Type of cables between inverter and motors
a) Suggested cable
Symmetrical Shielded cable:
- 3 phase conductors symmetrically arranged
- single phase non shielded conductors
- 3 PE conductors symmetrically arranged
- external global shielding for all phase and PE conductors
b) Suggested cable
Symmetrical shielded cable: as the previous one, but with a single PE conductor
located in the middle of the cable
c) Suggested cable
Symmetrical shielded cable: shielding with section greater than 50% of the section of
each phase conductor, therefore no further PE conductors are necessary.
d) Not allowed cable
e) Not allowed cable
f) Not allowed cable
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