Installation and Connection
3
3-42 | CFW-11
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
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).
Keep motor cables away from other cables (signal cables, sensor cables, control cables, etc.), according to
Table 3.11 on page 3-43.
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 three cables (U, V, W)
always together.
Shielded Cables:
They are mandatory when the electromagnetic compatibility directive (2004/108/EC) shall be met, as
defined by the standard EN 61800-3 "Adjustable Speed Electrical Power Drive Systems". These cables act
mainly by reducing the irradiated emission in the radio-frequency range.
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