vii
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 if a single-phase power supply is available, use a
three-phase motor as the inverter provides three-phase
output.
Environ-
mental
conditions
Installation
location
Use the inverter within the ambient temperature range from
-10 to +50
°
C.
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 2, Section 2.1 "Operating
Environment."
Installing an
MCCB or
RCD/ELCB
Install a recommended molded case circuit breaker (MCCB)
or residual-current-operated protective device (RCD)/earth
leakage circuit breaker (ELCB) (with overcurrent protection)
in the primary circuit of the inverter to protect the wiring.
Ensure that the circuit breaker rated current is equivalent to
or lower than the recommended rated current.
Installing an MC
in the secondary
circuit
If a magnetic contactor (MC) is mounted in the inverter's
output (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.
Remove the magnet contactor (MC) already installed and
built-in surge killer from the inverter's output (secondary)
circuit before installing the MC to switch the motor power.
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 terminal [FWD]/[REV] signals or the
RUN/STOP key.
Combina-
tion with
peripheral
devices
Protecting the
motor
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
current lower than the set value for the thermal relay. If this
happens, lower the carrier frequency or use the output circuit
filter (OFL).
Summary of Contents for FRENIC-Multi series
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