Mitsubishi Electric FR-F720-00046 Installation Manuallines page 3

CAUTION
• The electronic thermal relay function does not guarantee protection of the
motor from overheating. It is recommended to install both an external
thermal and PTC thermistor for overheat protection.
• Do not use a magnetic contactor on the inverter input for frequent starting/
stopping of the inverter.
• The effect of electromagnetic interference must be reduced by using a
noise filter or by other means. Otherwise nearby electronic equipment
may be affected.
• Appropriate measures must be taken to suppress harmonics. Otherwise
power supply harmonics from the inverter may heat/damage the power
factor correction capacitor and generator.
• When driving a 400V class motor by the inverter, the motor must be an
insulation-enhanced motor or measures must be taken to suppress surge
voltage. Surge voltage attributable to the wiring constants may occur at
the motor terminals, deteriorating the insulation of the motor.
• When parameter clear or all parameter clear is performed, the required
parameters must be set again before starting operations because all
parameters return to the initial value.
• The inverter can be easily set for high-speed operation. Before changing
its setting, the performances of the motor and machine must be fully
examined.
• Stop status cannot be hold by the inverter's brake function. In addition to
the inverter's brake function, a holding device must be installed to ensure
safety.
• Before running an inverter which had been stored for a long period,
inspection and test operation must be performed.
• For prevention of damage due to static electricity, nearby metal must be
touched before touching this product to eliminate static electricity from
your body.
CAUTION
(5) Emergency stop
• A safety backup such as an emergency brake must be provided to prevent
hazardous condition to the machine and equipment in case of inverter
failure.
• When the breaker on the inverter input side trips, the wiring must be
checked for fault (short circuit), and internal parts of the inverter for a
damage, etc. The cause of the trip must be identified and removed before
turning ON the power of the breaker.
• When any protective function is activated, appropriate corrective action
must be taken, and the inverter must be reset before resuming operation.
(6) Maintenance, inspection and parts replacement
CAUTION
• Do not carry out a megger (insulation resistance) test on the control circuit
of the inverter. It will cause a failure.
(7) Disposing of the inverter
CAUTION
• The inverter must be treated as industrial waste.
General instructions
Many of the diagrams and drawings in Instruction Manuals show the inverter
without a cover or partially open for explanation. Never operate the inverter
in this manner. The cover must be always reinstalled and the instruction in
Instruction Manuals must be followed when operating the inverter.
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