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 input side of this product for frequent starting/stopping of this product. Otherwise
the life of the product decreases.
Use a noise filter or other means to minimize the electromagnetic interference with other electronic equipment used
nearby this product.
Appropriate measures must be taken to suppress harmonics. Otherwise harmonics in power systems generated from
this product may heat/damage a power factor correction capacitor or a generator.
For a 400 V class motor driven by this product, 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 this product operation must be set again before the operation is started.
This product 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 this product by the product'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 this product which have been stored and not been operated for a long period, perform an inspection and
a test operation.
To avoid damage to this product due to static electricity, static electricity in your body must be discharged before you
touch this product.
Only one PM motor can be connected to a single unit of this product.
A PM motor must be used under PM motor control. Do not use a synchronous motor, induction motor, or synchronous
Do not connect a PM motor to this product at a setting for the induction motor control (initial setting). Do not connect an
induction motor to this product at a setting for PM motor control. Doing so will cause a failure.
As a process of starting a PM motor, turn ON the power of this product first, and then close the contactor on the output
side of this product.
When the emergency drive function is enabled, the operation is continued or the retry operation (automatic reset and
restart) is repeated even if a fault occurs, which may damage or burn this product and the motor. Before restarting the
normal operation after the operation using the emergency drive function, make sure that this product and the motor have
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 a breaker on the input side of this product is tripped, the wiring must be checked for a fault (such as short circuit), and
internal parts of this product for a damage, etc. Identify and remove the cause of the trip before resetting the tripped
breaker (or before applying the power to this product again).
When any protective function is activated, take an appropriate corrective action before resetting this product to resume
Maintenance, inspection and parts replacement
Do not carry out a megger (insulation resistance) test on the control circuit of this product. Doing so will cause a failure.
This product must be treated as industrial waste.