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CAUTION
:
If the operation of the motor with a variable frequency
drive (VFD) is necessary, the readings listed in the standard NEMA-MG1
Section 4 Part 31, or in the NEMA MG2-Section 6 must be addressed. In
addition:
1. Variable frequency drive must be properly selected, according to the
power of the motor and the conditions of the electrical supply (such
as number of phases, voltage, and current capacity).
2. Connect the motor, the VFD, metal conduit and any metal part to an
independent grounding circuit. The VFD must be mounted as close
as possible to the motor.
3. Use conductor with the appropriate gauge, the shortest possible
length and canalized through metal conduits. In addition the
conductors can be shielded to reduce electromagnetic interference
with electronic equipment.
4. The operation of a motor with a VFD causes an increase in
operating temperature which in turn leads to the deterioration of the
insulation on the windings.
WARNING
:
Always attend the safety instructions of the VFD
manufacturer. High AC and DC voltages are present in a VFD even after the
VFD is de-energized. See VFD operation manual to avoid personnel injury.
In order not to affect the optimal functioning of the motor-VFD system and to
ensure proper insulation; the length of the power leads from the VFD to the
motor shall not exceed those listed in
Table 1.1. Maximum power leads
length from VFD output to motor
.
Table 1.1 Maximum power lead length from VFD output to motor.
Frame Size
230 V
460V
575V
NEMA
143-320
600 ft.
125 ft.
40 ft.
NEMA
360-449
100 ft.
225 ft.
60 ft.
Summary of Contents for SIMOTICS GP
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