Output Connections - WEG CFW700 Serie Manual Del Usuario

3.2.3.3 Output Connections

ATTENTION!
The inverter has an electronic motor overload protection that shall be
adjusted according to the driven motor. When several motors are connected
to the same inverter, install individual overload relays for each motor.
The motor overload protection available for the CFW700 is in accordance
with UL508C as per the following information:
- Trip current equal to 1.25 times the motor rated current (P0401)
adjusted in the oriented start-up menu.
- The maximum value of P0398 (Motor Service Factor) is 1.15.
- Parameters P0156, P0157 and P0158 (Overload Current at 100 %, 50
% and 5 % of the rated speed, respectively) are automatically adjusted
when the parameters P0401 (Motor Rated Current) and/or P0406 (Motor
Ventilation) are changed on the "Oriented Start-up" menu. If the parameters
P0156, P0157 and P0158 are set manually, the maximum allowed value
is 1,05 x P0401.
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.
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 sizes A, B and C there is an accessory called "Shielding kit for power cables PCSx-
01" (see section 7.2 - Accessories), which can be mounted at the bottom of the cabinet – the
figure 3.4 shows an example. The shielding kit for power cables PCSx-01 goes along with
inverters with optional internal RFI filter (CFW700...C3...). The grounding for the motor cable
shield on inverter 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 sizes A, B and C.
Figure 3.4: Motor cable shielding connection with PCSx-01 accessory
Installation and Connection
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CFW700 | 19