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Geared motors
Synchronous mo-
In running
tors
special
motors
Single-phase
motors
Environ-
Installation loca-
mental con-
tion
ditions
Installing an
MCCB or
RCD/ELCB
Installing an MC
in the secondary
circuit
Combina-
tion with pe-
ripheral de-
Installing an
vices
MC in the pri-
mary circuit
Protecting the
motor
If the power transmission mechanism uses an oil-lubricated
gearbox or speed changer/reducer, then continuous motor
operation at low speed may cause poor lubrication. Avoid
such operation.
It is necessary to take special measures suitable for this
motor type. Contact Fuji for details.
Single-phase motors are not suitable for inverter-driven
variable speed operation. Use three-phase motors.
* Even if a single-phase power supply is available, use a
three-phase motor as the inverter provides three-phase
output.
Use the inverter within the ambient temperature range from
-10 to +50C.
The heat sink and braking resistor of the inverter may be-
come hot under certain operating conditions, so install the
inverter on nonflammable material such as metal.
Ensure that the installation location meets the environmental
conditions specified in Chapter 2, Section 2.1 "Operating
Environment."
Install a recommended molded case circuit breaker (MCCB)
or residual-current-operated protective device (RCD)/earth
leakage circuit breaker (ELCB) (with the exception of those
exclusively designed for protection from ground faults) in the
primary circuit of the inverter to protect the wiring. Ensure
that the circuit breaker capacity is equivalent to or lower
than the recommended capacity.
If a magnetic contactor (MC) is mounted in the inverter's
secondary circuit for switching the motor to commercial
power or for any other purpose, ensure that both the
inverter and the motor are completely stopped before you
turn the MC on or off.
Do not connect a magnet contactor united with a surge killer
to the inverter's secondary circuit.
Do not turn the magnetic contactor (MC) in the primary cir-
cuit on or off more than once an hour as an inverter fault
may result.
If frequent starts or stops are required during motor opera-
tion, use FWD/REV signals or the RUN/STOP key.
The electronic thermal function of the inverter can protect
the motor. The operation level and the motor type (general-
purpose motor, inverter motor) should be set. For high-
speed motors or water-cooled motors, set a small value for
the thermal time constant and protect the motor.
If you connect the motor thermal relay to the motor with a
long wire, a high-frequency current may flow into the wiring
stray capacitance. This may cause the relay to trip at a cur-
rent lower than the set value for the thermal relay. If this
happens, lower the carrier frequency or use the output cir-
cuit filter (OFL).
xi
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