Output Connections - WEG CFW-11 User Manual

Installation and Connection

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.
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
3
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
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.
Recommendations for the motor cables
Unshielded Cables:
Can be used when it is not necessary to meet the European directive of electromagnetic compatibility
(2004/108/EC), unless the RFI filters be used as presented in the
Installation on page
Keep motor cables away from other cables (signal cables, sensor cables, control cables, etc.), according to
Table 3.5 on page
The emission of the cables may be reduced by installing them inside a metal conduit, which shall be grounded
at both ends.
Connect a fourth cable between the motor ground and the inverter ground.
NOTE!
The magnetic field created by the current circulation in these cables may induce current in close
metal pieces, heat them, and cause additional electrical losses. Therefore, keep the 3 (three) cables
(U, V, W) always together.
3-24 | CFW-11
3-38.
3-25.
Table 3.15 on page 3-47 and Item 3.3.1