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3. PRECAUTIONS FOR USE OF THE INVERTER
3.5 Countermeasures against deterioration of the 600 V class motor insulation
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3.5 Countermeasures against deterioration of the 600
V class motor insulation
In the PWM type inverter, a surge voltage attributable to wiring constants is generated at the motor terminals. Especially for a
600 V class motor, the surge voltage may deteriorate the insulation.
• Surge voltage at a motor terminal by motor wiring length (reference)
When the 600 V class motor is driven by the inverter, consider the following measures:
Measures
• Inverter duty motor
Select an inverter duty motor. Many motor manufacturers sell motors with insulation systems designed to withstand the stress
imposed by PWM inverters
• AC reactor
For added protection, install an AC reactor on the inverter output.
100%
0
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Voltage at a motor terminal (%)
10 20 30 40 50 60 70 80 90 100
Motor wiring length (m)
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