Inovance MD500-PLUS Series - Page 133

Electrical Installation
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For the motor cable shield, use a shortest possible lead wire with a width no less than
one‑fifth of the length.
Figure 7‑31 Lead wire of the motor cable shield
Motor cable length requirements
During operation of the AC drive, the quick on‑off of the power switching tube can
lead to excessively large dU/dt on the output side. A long motor cable may result in
excessive voltage stress on the motor winding, causing insulation breakdown. Use
motors that comply with IEC60034‑25 IVIC B or motors with high insulation and
withstand voltage. In addition, when the cable length increases, the distributed
capacitance of the cable increases linearly, resulting in harmonic current.
When using a motor cable longer than the maximum length indicated in the following
table, install an output reactor on the output side of the AC drive, or use a motor
conforming to IEC60034‑25 IVIC B. The output reactor can reduce the voltage stress
on the motor winding.
Table 7–15 Requirement for output reactor based on cable length and motor types
AC Drive Rated
Power (kW)
Maximum Cable
Length of the
Common
Asynchronous Motor
(m)
IEC60034‑25 IVIC B
Compliant
Common
Asynchronous
Induction Motor
0.4–3.7 50 m
Not required Required
5.5 70 m
Not required Required
7.5 100 m
Not required Required
11 110 m
Not required Required
15 125
Not required Required
18.5 135
Not required Required
22 150
Not required Required
≥ 30 150
Not required Required