Braking Resistor Terminals, P And Db; Main Circuit Power Input Terminals; Driving 400 V Series Motor - FujiFilm FVR-Micro Instruction Manual

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 (Carrier frequency)).
• 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.
- 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).
③

Braking resistor terminals, P and DB

1) Connect terminals P and DB of a braking resistor (option) to terminals P and DB on the main
circuit terminal block.
2) Arrange the inverter and braking resistor to keep the wiring length to 5 m or less and twist the two
wires or route them together in parallel.
④
Main circuit power input terminals, L1/R, L2/S, and L3/T (for three-phase voltage input)
or L1/L and L2/N (for single-phase voltage input)
1) For safety, make sure that the molded case circuit breaker (MCCB) or magnetic contactor (MC) is
turned off before wiring the main circuit power input terminals.
2) Connect the main circuit power supply wires (L1/R, L2/S and L3/T or L1/L and L2/N) to the input
terminals of the inverter via an MCCB or residual-current-operated protective device (RCD)/earth
leakage circuit breaker (ELCB)*, and MC if necessary.
It is not necessary to align phases of the power supply wires and the input terminals of the inverter
with each other.
* With overcurrent protection
It is recommended that a magnetic contactor be inserted which can be manually activated.
This is to allow you to disconnect the inverter from the power supply in an emergency (e.g.,
when the protective function is activated) so as to prevent a failure or accident from causing
the secondary problems.
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