WEG CFW-11 User Manual - page 51
Installation and Connection
3
CFW-11 | 3-25
3.2.3.3 Output Connections
ATTENTION!
The inverter has an electronic motor overload protection that must be adjusted according to the
driven motor. When several motors are connected to the same inverter, install individual overload
relays for each motor.
ATTENTION!
The motor overload protection available in the CFW-11 is in accordance with the IEC60947-4-2
and UL508C standards, note 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 for 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 parameters P0401 (Motor Rated Current)
and/or P0406 (Motor Ventilation) are adjusted in the oriented start-up routine. If parameters
P0156, P0157 and P0158 are manually adjusted, 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
it with a spinning motor or with voltage at the inverter output.
The characteristics of the cable used to connect the motor to the inverter, as well as its 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.
Recommendations for motor cables:
Unshielded Cables:
Can be used when it is not necessary to meet the European directive of electromagnetic compatibility
(2014/30/EU).
Keep motor cables away from other cables (signal cables, sensor cables, control cables, etc.), according to
the
Table 3.6 on page 3-27
.
The emission of the cables may be reduced by installing them inside a metal conduit, which must be grounded
at both ends.
Connect a fourth cable between the motor ground and the inverter ground.