WEG CFW700 User Manual - page 23
18 | CFW700
Installation and Connection
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ATTENTION!
If a disconnect switch or a contactor is installed between the inverter and the
motor, never operate them with a spinning motor or with voltage at the inverter
output.
The characteristics of the cable used for the inverter and motor interconnection, as well as
the physical location are extremely important to avoid electromagnetic interference in other
equipment and to not affect the life cycle of motor windings and motor bearings controlled by
inverters.
Keep motor cables away from other cables (signal cables, sensor cables, control cables, etc.),
according to
item 3.2.6 Cable Distances on page 23
.
Connect a fourth cable between the motor ground and the inverter ground.
When using shielded cables for connecting the motor:
Follow the recommendations of IEC60034-25.
Use low impedance connection to high frequencies to connect the cable shield to ground.
Using parts supplied with the drive. See item below.
For inverter frame sizes A, B and C there is an accessory called “Shielding kit for power
cables PCSx-01” (see
section 7.2 ACCESSORIES on page 58
), which can be mounted at
the bottom of the cabinet – the
shows an example. The shielding
kit for power cables PCSx-01 goes along with inverters with optional internal C3 RFI filter
(CFW700...C3...). The grounding for the motor cable shield on inverter frame sizes D and E is
already provided in the standard inverter cabinet. This is also provided on the “Nema1 Kits
(KN1x-01)” of the inverter frame sizes A, B and C.
For frame sizes B and C with degree of protection IP55, the accessory "PCSC-03 power
cable shield kit" is available, and for frame size D and E with degree of IP55 use the standard
accessories for shielding. The PCSC-03 shield kit comes with the inverter as optional item N12.
Figure 3.4: Motor cable shielding connection with PCSx-01 accessory