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INSTALLATION AND CONNECTION
!
WARNING!
The motor overload protection available in the CFW900 is in accordance with the IEC609047-4-2 and
UL61800-5-1, standards, note the following information:
“Trip” current equal to 1.25 times the motor rated current (C2.1.5) adjusted in the Oriented “Start-up
”menu.
The maximum value of parameter C7.4.6 (Motor Thermal Class) is 3 (class 20).
The maximum value for C2.1.11 (Motor service factor) is 1.15.
The maximum value of the overload current parameters C7.4.3, C7.4.4 and C7.4.5 is 100%.
!
WARNING!
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 to connect the motor to the inverter, as well as its interconnection and 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.
Keep motor cables away from other cables, such as signal cables, control cables, etc.), according to
.
Table 3.9:
Cable separation distance
Cable length
Minimum separation distance
≤
30 m
≥
10 cm
> 30 m
≥
25 cm
3.2.4.3.1 Motor cables
Unshielded cables:
Can be used when it is not necessary to meet the European directive of electromagnetic compatibility (IEC 61800-
3).
The emission of the cables may be reduced by installing them inside a metal conduit, which shall be grounded
at both ends.
It is necessary to 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.
Shielded cables:
They are mandatory when it is necessary to comply with the electromagnetic compatibility standard, as defined
by IEC 61800-3 standard “Adjustable Speed Electrical Power Drive Systems”.
These cables act mainly by reducing the irradiated emission in the radio-frequency range.
In reference to the type and details of installation, follow the recommendations of IEC 60034-25 “Guide For Design
and Performance of Cage Induction Motors Specifically Designed For Converter Supply”, refer to a summary in
. Refer to the standard for further details and eventual modifications related to new revisions.
The grounding system shall be well interconnected among the several installation locations such as the grounding
points of the motor and the inverter. Voltage difference or impedance between the several points may cause
the circulation of leakage currents among the equipment connected to the ground, resulting in electromagnetic
interference problems.
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Summary of Contents for CFW900
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