Installation and Connection
3-24 | CFW-11M G2
3
3.2.7 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 on the CFW-11M G2 complies with IEC609047-4-2 and
UL508C, notice the information below:
Trip current equal to 1.25 times the motor rated current (P0401) set on the "Oriented Start-up" menu.
The maximum value of parameter 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 set when parameters P0401 (motor rated current) and/or P0406 (motor
cooling) are set on the "Oriented Start-up" menu. If parameters P0156, P0157 and P0158 are manually
set, the maximum value allowed 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.
Use two parallel cables with the gauge indicated in
to interconnect connections U, V and
W of the UP11 with the paralleling busbar (motor connection).
Table 3.9:
Connection cables U, V and W
Current (A)
Voltage (V)
Duty
Minimum Cable
Cross Section
(mm²)
634
380-480
ND
(2X) 300
515
HD
(2X) 185
496
500-600
ND
(2X) 185
380
HD
(2X) 120
439
660-690
ND
(2X) 150
340
HD
(2X) 120
ATTENTION!
Cables U, V and W of all phases of all paralleled UP11 must have the same length so as to prevent
current imbalance.
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:
They can be used when it is not necessary to comply with the European electromagnetic compatibility directive
(2014/30/EU).
Keep motor cables away from other cables (signal cables, sensor cables, control cables, etc.), according to
.
The emission of the cables can be reduced by installing them within a metallic conduit, which must be grounded
at least at both ends.
Connect a fourth cable between the motor ground and the inverter ground.
