iv
Geared motors
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.
Synchronous
motors
It is necessary to take special measures suitable for this motor type. Contact
your Fuji Electric representative for details.
In running
special
motors
Single-phase
motors
Single-phase motors are not suitable for inverter-driven variable speed
operation. Use three-phase motors.
* Even a single-phase inverter provides three-phase output, so use a
three-phase motor.
Environ-
mental
conditions
Installation
location
Use the inverter within the ambient temperature range from -10 to +50qC
(+14 to 122qF ).
The heat sink and braking resistor of the inverter may become 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 8, Section 8.5 "Operating Environment and Storage
Environment."
Installing an
MCCB or
RCD/GFCI
Install a recommended molded case circuit breaker (MCCB) or
residual-current-operated protective device (RCD)/ground-fault circuit
interrupter (GFCI) (with overcurrent protection) 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.
Installing an MC
in the secondary
circuit
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.
Installing an MC
in the primary
circuit
Do not turn the magnetic contactor (MC) in the primary circuit on or off
more than once an hour as an inverter failure may result.
If frequent starts or stops are required during motor operation, use
FWD/REV signals or the RUN/STOP key.
Combina-
tion with
peripheral
devices
Protecting the
motor
The electronic thermal overload protection 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 current lower than the set value for the
thermal relay. If this happens, lower the carrier frequency or use the output
circuit filter (OFL).
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