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No output circuit filter inserted
Power
supply
Inverter
50 m or less
• Do not connect a condensive capacitor or surge absorber to the inverter output ter-
minals.
• If the wiring length is long, the stray capacitance between the wires will increase,
resulting in an outflow of the leakage current. It will activate the overcurrent protec-
tion, increase the leakage current, or will not assure the accuracy of the current dis-
play. In the worst case, the inverter could be damaged.
• If more than one motor is to be connected to a single inverter, the wiring length
should be the length of the wires to the motors.
Driving 400 V series motor
• If a thermal relay is installed in the path between the inverter and the motor to protect
the motor from overheating, the thermal relay may malfunction even with a wiring
length shorter than 50 m. In this situation, add an output circuit filter (option) or lower
the carrier frequency (Function code F26: Motor sound (Sound tune)).
• If the motor is driven by a PWM-type inverter, surge voltage that is generated by
switching the inverter component may be superimposed on the output voltage and
may be applied to the motor terminals. Particularly if the wiring length is long, the
surge voltage may deteriorate the insulation resistance of the motor. Consider any of
the following measures.
- Use a motor with reinforced insulation. (All Fuji's standard motors feature rein-
forced insulation.)
- Connect an output circuit filter (option) to the output terminals of the inverter.
- Minimize the wiring length between the inverter and motor (10 to 20 m or less).
Power
supply
Motor
Inverter
2-9
Output circuit filter inserted
5 m or less
Output circuit filter
400 m or less
Motor
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