WEG CFW11W G2 Series User Manual page 43

Installation and Connection
ATTENTION!
If a switch-disconnector or a contactor are installed on the motor power supply, never operate them
with the motor spinning or with voltage in the inverter output.
Use four cables in parallel with the gauge indicated in
and W of the UP11W with the paralleling busbar (motor power supply).
3
ATTENTION!
Cables U, V and W of all phases of all UP11W G2 must have the same length so as to prevent current
imbalance.
The characteristics of the cable used to connect the motor to the inverter, as well as its interconnection and routing,
are extremely important to avoid electromagnetic interference in other equipment and not to affect the life cycle
of windings and bearings of the controlled motors.
Instructions for the motor cables:
Cables without Shield:
They can be used when it is not necessary to comply with the European electromagnetic compatibility directive
„
(89/336/EEC).
Keep motor cables away from other cables (signal cables, sensor cables, control cables, etc.), according to
„
Table 3.8 on page
The emission of the cables can be reduced by installing them within a metal conduit, which must be grounded
„
at least at both ends.
Connect a fourth cable between the motor ground and the inverter ground.
„
NOTE!
The magnetic field created by the current flow on those cables may induce currents on metal parts
nearby, heating them up and causing additional electric losses. Therefore, keep the cables of phases
U, V and W always together.
Shielded Cables:
They are mandatory when it is necessary to comply with the electromagnetic compatibility directive (89/336/
„
EEC), as defined by EN 61800-3 "Adjustable Speed Electrical Power Drive Systems". It mainly acts reducing the
electromagnetic radiation disturbance produced by the motor cables in the radio frequency band.
Regarding the installation types and details, follow the recommendations of IEC 60034-25 "Guide For Design
„
and Performance of Cage Induction Motors Specifically Designed For Converter Supply"; see summary in
3.31 on page 3-27. Refer to the standard for further details and occasional changes related to the new revisions.
Keep motor cables away from other cables (signal cables, sensor cables, control cables, etc.), according to
„
Table 3.13 on page
3-26 | CFW-11W G2
Table 3.12: Connection cables U, V and W
Current (A) Voltage (V)
780
500-690
640
3-14.
3-27.
Table 3.7 on page 3-12 to interconnect connections U, V
Minimum Cable
Steady-state
Cross Section (mm²)
ND (4X) 120
HD (4X) 95
Figure