Siemens SIMOTICS GP Operating Instructions Manual page 83

CAUTION:
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:
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.
Frame Size
NEMA
143-320
NEMA
360-449
Table 1.1 Maximum power lead length from VFD output to motor.
Unrestricted
If the operation of the motor with a variable frequency
Always attend the safety instructions of the VFD
230 V
600 ft.
100 ft.
83
460V
125 ft.
225 ft.
575V
40 ft.
60 ft.
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