Orientalmotor FE100 Operating Manual page 11

Handling
• Impressing voltage on the motor terminals (U, V and W) on the rear of the
inverter may damage the inverter. Before turning on the power, confirm that the
power supply is wired correctly.
• If an electromagnetic contactor is connected between the power supply and
inverter, do not start or stop the inverter using the electromagnetic contactor.
Doing so may damage the inverter.
Peripherals
Installation and selection of protective devices
Install a protective device between the power supply and inverter to protect the
inverter's primary circuit. For details on selecting an appropriate protective device
for this purpose, refer to 11.3 "Recommended peripherals" on p.58. Since a fully
electromagnetic molded-case circuit breaker can change the operating characteristics
of the inverter by generating harmonic current, select a breaker with a large capacity
if this type of circuit breaker is used. In the case of an earth-leakage breaker, use of a
special earth-leakage breaker for inverter, or a general earth-leakage breaker with a
current sensitivity of 200 mA or more, is recommended.
Use of an electromagnetic contactor between the power supply and
inverter
The inverter can be used without an electromagnetic contactor between the power
supply and inverter. An electromagnetic contactor is sometimes installed between
the power supply and inverter for the purpose of preventing the inverter from
starting automatically upon recovery from a momentary power outage. In this case,
do not use the electromagnetic contactor to start or stop the inverter. Doing so may
damage the inverter.
If an electromagnetic contactor is installed between the inverter and motor, as a rule
do not turn on/off the inverter power while the motor is operating. If an
electromagnetic contactor is provided to switch between the mains and other power
source, always stop the inverter and motor before switching to the mains.
If an electromagnetic contactor is used as a safety device in the event of momentary
power outage, use a delayed-release type electromagnetic contactor.
Improvement of power factor (Elimination of phase-advanced
capacitor)
To improve the power factor of the inverter, connect a DC reactor to the reactor
terminals on the inverter. Connecting a capacitor or surge killer to the inverter's
output side for the purpose of improving the power factor may generate harmonics
in the inverter output, thus causing the motor to overheat or sustain damage. Also,
overcurrent may flow into the inverter and activate the inverter's overcurrent
protection function. Therefore, do not connect a capacitor or surge killer to the
inverter.
3 Precautions for use
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