The electronic thermal O/L relay function may not be enough for protection of a motor from overheating. It is
recommended to install an external thermal relay or a PTC thermistor for overheat protection.
Do not use a magnetic contactor on the inverter input side for frequent starting/stopping of the inverter. Otherwise the
life of the inverter decreases.
Use a noise filter or other means to minimize the electromagnetic interference with other electronic equipment used
nearby the inverter.
Appropriate measures must be taken to suppress harmonics. Otherwise harmonics in power systems generated from
the inverter may heat/damage a power factor correction capacitor or a generator.
For a 400 V class motor driven by the inverter, use an insulation-enhanced motor, or take measures to suppress surge
voltage. Otherwise surge voltage attributable to the line constants may occur at the motor terminals, deteriorating the
insulation of the motor.
As all parameters return to their initial values after the Parameter clear or All parameter clear is performed, the needed
parameters for the inverter operation must be set again before the operation is started.
The inverter can be easily set for high-speed operation. Therefore, consider all things related to the operation such as
the performance of a motor and equipment in a system before the setting change.
The stop state of the inverter by the inverter's brake function (DC injection brake function) cannot be held. Install a device
to apply brakes to a motor or equipment in a system for safety.
Before running an inverter which have been stored and not been operated for a long period, perform an inspection and
a test operation.
To avoid damage to the product due to static electricity, static electricity in your body must be discharged before you
touch the product.
Only one PM motor can be connected to one inverter.
A PM motor must be used under PM sensorless vector control. Do not use a synchronous motor, induction motor, or
synchronous induction motor.
Do not connect a PM motor to the inverter at a setting for the induction motor control (initial setting). Do not connect an
induction motor to the inverter at a setting for PM sensorless vector control. Doing so will cause a failure.
As a process of starting a PM motor, turn ON the inverter power first, and then close the contactor on the output side of
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 the inverter failure.
If a breaker on the inverter input side is tripped, the wiring must be checked for a fault (such as short circuit), and internal
parts of the inverter for a damage, etc. Identify and remove the cause of the trip before resetting the tripped breaker (or
before applying the power to the inverter again).
When any protective function is activated, take an appropriate corrective action before resetting the inverter to resume
Maintenance, inspection and parts replacement
Do not carry out a megger (insulation resistance) test on the control circuit of the inverter. Doing so will cause a failure.
The product must be treated as industrial waste.
For clarity purpose, illustrations in this Instruction Manual may be drawn with covers or safety guards removed. Ensure
all covers and safety guards are properly installed prior to starting operation. For details on the PM motor, refer to the
Instruction Manual of the PM motor.