Electrical Installation
‑153‑
Figure 8‑32 Wiring of the shield
Keep the lead wire of the motor cable shield as short as possible, with its width (b in
the following figure) no shorter than 1/5 of its length (a in the following figure).
Figure 8‑33 """"Lead 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. Use motors that comply with technical specifications in IEC 60034‑25 IVIC
B or motors with excellent insulation performance and high voltage resistance. In
addition, when the cable length increases, the distributed capacitance of the cable
increases linearly, resulting in high harmonic current.
When the length of the motor cable is longer than the maximum length
recommended in the following table, install an output reactor on the output side of
the AC drive, or use a motor conforming to technical specifications in IEC 60034‑25
IVIC B. The output reactor can reduce the voltage stress on the motor winding.
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