Inovance MD580 Series - Cable Lug Selection

Electrical Design
‑66‑
Figure 3‑13 Drain wire of the motor cable shield
Length of motor cables
When the AC drive is working, the quick on‑off of its power switch triode can lead to
excessively large dU/dt at the output side. If the motor cable is too long, the motor
winding will experience excessive voltage stress that may cause insulation
breakdown. Therefore, use motors that comply with IEC60034‑25 IVIC B requirements
or motors featuring high withstand voltage. In addition, distributed capacitance on a
cable increases linearly with the length of the cable, and may easily result in
harmonic current.
When using a motor cable longer than the maximum length indicated in the following
table, install an output reactor at 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 3–9 Requirement for output reactor based on cable length and motor types
AC Drive Rated
Power (kW)
Maximum Cable Length of
Common Asynchronous
Motor (m)
IEC60034‑25 IVIC B
Motor
Common
Asynchronous
Induction Motor
0.4 to 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
3.3.4 Cable Lug Selection
Cable lugs recommended in the following table are GTNR series and BC series of
Suzhou Yuanli.