Mitsubishi Electric FR-E720-0.4K Instruction Manual page 3

(2) Wiring
CAUTION
 Do not install a power factor correction capacitor, surge
absorber, or radio noise filter on the output side of this
product. These devices may overheat 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
CAUTION
 Before starting operation, each parameter must be
confirmed and adjusted. Failure to do so may cause some
machines to make unexpected motions.
(4) Usage
WARNING
 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 provided.
 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 product
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.
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. 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 precautions 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 with the inverter, the motor
must be an insulation-enhanced motor or measures must be
taken to suppress surge voltage. Otherwise surge voltage,
which is attributed to the length and thickness of wire, may
occur at the motor terminals, causing the motor insulation
to deteriorate.
 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.
 This product's brake function cannot be used as a
mechanical brake. Use a separate device instead.
 Perform an inspection and test operation of this product if it
has been stored for a long period of time.
 Static electricity in your body must be discharged before
you touch the product. Otherwise the product may be
damaged.
 If you are installing the inverter to drive a three-phase
device while you are contracted for lighting and power
service, consult your electric power supplier.
(5) Emergency stop
CAUTION
 A safety backup such as an emergency brake must be
provided for devices or equipment in a system to prevent
hazardous conditions in case of failure of this product or an
external device controlling this product.
 If the breaker installed on the input side of this product trips,
check for wiring faults (short circuits etc.) and damage to
internal parts of this product. 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 this product 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 this product. It will cause a failure.
(7) Disposal
CAUTION
 This product must be treated as industrial waste.
(8) Application of caution labels
CAUTION
Caution labels are used to ensure safety during use of
Mitsubishi Electric inverters.
Apply the following labels to the inverter if the "retry function"
and/or "automatic restart after instantaneous power failure"
have been enabled.
 For the retry function
CAUTION
Retry Function Has
Been Selected
Stay away from the motor and machine.
They will start suddenly (after given
time has elapsed) when alarm occurs.
 For automatic restart after instantaneous power failure
CAUTION
Automatic Restart after
Instantaneous Power
Failure Has Been Selected
Stay away from the motor and machine.
They will start suddenly (after reset
time has elapsed) when
instantaneous power failure occurs.
General instruction
Many of the diagrams and drawings in this Instruction Manual
(Basic) show the product without a cover or partially open for
explanation. Never operate the product in this manner. The
cover must be always reinstalled and the instruction in this
Instruction Manual (Basic) must be followed when operating
the product.
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