Notes to Inverter Users
■ Precautions for Application of Inverter
● Power supply
1. When the inverter is connected
directly to a large-capacity power supply (especially in a 400 V line), excessively large
peak will flow in, breaking the inverter unit. In such a case, install an AC reactor (option) on the input side of the inverter
unit.
2. Install an AC reactor in the following cases as well.
1) There is a possibility of surge voltage generated in the power supply system: When surge energy flows into the
inverter, OV tripping may result.
2) When a large-capacity thyristor Leonard or other phase control units are installed
3. When the inverter is operated by a private power generator, secure a sufficiently large generation capacity for the inverter
kVA in consideration of the influence of higher harmonic current on the generator.
● Installation
1. Do not install the inverter in places with poor environmental conditions subjected to dust, oil mist, corrosive gas, or
inflammable gas.
2. In places where there is suspended matter in the air, install the inverter inside a “closed-type” panel to prevent entry of
suspended matter. Determine the cooling method and dimensions of the panel so that the ambient temperature around
the inverter will be lower than the allowable temperature.
3. Vertically install the inverter on a wall. Do not install it on wood or other inflammable products.
● Handling
1. Do not connect the output terminal UVW of the inverter to the power supply; otherwise the inverter will be broken.
Carefully check the wiring for correct arrangement before turning on the power.
2. It takes some time for the internal capacitors to discharge completely after the power is turned off. Check that the charge
lamp on the printed circuit board is OFF before inspection.
● Operation
1. Do not start and stop the inverter frequently by means of an electromagnetic contactor (MC) installed on the input side of
the inverter; otherwise failure of the inverter will result.
2. When more than one motor is operated by one inverter, select the inverter capacity so that 1.1 times the total rated
current of the motors will not exceed the rated output current of the inverter.
3. When an error occurs, the protective function is activated and the inverter trips and stops operation. In that case, motors
will not stop immediately. When emergency stop is desired, use mechanical brakes as well.
4. The acceleration time of the motor is subject to the inertial moment of the motor and load, motor torque, and load torque.
1) When the acceleration time setting is too short, the stall prevention function is activated, and the setting time is
elongated automatically. For stable acceleration and deceleration, set longer time so that the stall prevention function
will not be activated.
2) When the deceleration time is too short, the stall prevention function is activated or OV tripping will result. Set longer
deceleration time or install a braking unit/braking resistor.
● Setting
The HF-320Dinverter is set in the V/F constant control mode before shipment from our factory. When control without a
sensor is necessary, change the setting.
■ When Operating 400 V Class Standard Motor
When the inverter is used to drive a standard motor (general-purpose motor), a high carrier frequency type inverter (e.g.
IGBT) requiring high input voltage (more than 400 V) is necessary. When the wiring distance is long, the dielectric strength
of the motor must be taken into consideration. Contact us in such cases.
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