2-9
No output circuit filter inserted Output circuit filter inserted
• Do not connect a power factor correcting capacitor or surge absorber to the inverter’s
output lines (secondary circuit).
• 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 protection,
increase the leakage current, or will not assure the accuracy of the current display. 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 insulation that withstands the surge voltage. (All Fuji standard
motors feature insulation that withstands the surge voltage.)
- Connect an output circuit filter (option) to the output terminals (secondary circuits) of
the inverter.
- Minimize the wiring length between the inverter and motor (10 to 20 m or less).
Wiring length for EMC filter built-in type
• When the wiring length between the inverter and motor exceeds 10 m, the filter circuit
may be overheated and damaged due to increase of leakage current. To reduce the
leakage current, set the motor sound (carrier frequency) to 2 kHz or below with func-
tion code F26.
Motor
50 m or less
Output circuit filter
400 m or less
5 m or less
Motor
Power
supply
Inverter
Power
supply
Inverter
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