Grounding Connections - WEG MW500 User Manual

Installation and Connection
ATTENTION!
If a disconnect switch additional or a contactor is installed at the power supply
between the inverter and the motor, never operate it with the motor spinning
or with voltage at the inverter output.
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.
Keep motor cables away from other cables (signal cables, sensor cables, control cables, etc.),
according to Item 3.2.7 Cable Separation Distance on page
Connect a fourth cable between the motor ground and the inverter ground.
When using shielded cables to install the motor:
Follow the safety recommendations of IEC60034-25.
„
Use the low impedance connection for high frequencies to connect the cable shield to the
„
grounding. Use parts supplied with the inverter.

3.2.4 Grounding Connections

DANGER!
The inverter must be connected to a protection grounding (PE).
„
Use grounding wiring with a gauge at least equal to that indicated in
„
B.1 on page
The maximum tightening torque of the grounding connections is of 1.7 N.m
„
(15 lbf.in).
Connect the grounding points of the inverter to a specific grounding rod, or
„
specific grounding point or to the general grounding point (resistance ≤ 10 Ω).
Do not share the grounding wiring with other equipment that operate with
„
high currents (e.g. high power motors, soldering machines, etc.).
14 | MW500
Figure 3.3: Details of the connection of the motor cable
127.
17.
Table