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Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual Page 3

Fr-e700 series.
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(2) Wiring
Do not install a power factor correction capacitor or surge
suppressor/capacitor type filter on the inverter output
side. These devices on the inverter output side may be
overheated or burn out.
The connection orientation of the output cables U, V, W to
the motor affects the rotation direction of the motor.
(3) Trial run
Before starting operation, each parameter must be
confirmed and adjusted. A failure to do so may cause
some machines to make unexpected motions.
(4) Usage
Any person must stay away from the equipment when the
retry function is set as it will restart suddenly after trip.
Since pressing
key may not stop output depending
on the function setting status, separate circuit and switch
that make an emergency stop (power OFF, mechanical
brake operation for emergency stop, etc.) must be
OFF status of the start signal must be confirmed before
resetting the inverter fault. Resetting inverter alarm with
the start signal ON restarts the motor suddenly.
The inverter must be used for three-phase induction motors.
Connection of any other electrical equipment to the
inverter output may damage the equipment.
Do not modify the equipment.
Do not perform parts removal which is not instructed in this
manual. Doing so may lead to fault or damage of the product.
The electronic thermal relay function does not guarantee
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. Otherwise the
life of the inverter decreases.
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.
(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
Do not carry out a megger (insulation resistance) test on
the control circuit of the inverter. It will cause a failure.
(7) Disposal
The inverter must be treated as industrial waste.
General instruction
Many of the diagrams and drawings in this Instruction
Manual 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
this Instruction Manual must be followed when operating
the inverter.


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