ＮＩＳＳＥＩ ＣＯＲＰＯＲＡＴＩＯＮ E6581815
A-13
1
1.4 Notes on the application
1.4.1 Motors
When this inverter and our IPM Gear Motor are used in conjunction, pay attention to the following items.
Caution
Mandatory
action
Use an inverter that conforms to the IPM Gear Motor of our products “GTR-ECO series” being
operated. If the inverter being used does not conform to those specifications, not only will the IPM Gear
Motor not rotate correctly, but it may cause serious accidents through overheating and fire.
Comparisons with commercial power operation
This inverter employs the sinusoidal PWM system. However, the output voltage and output current are
not perfect sine waves, they have a distorted wave that is close to sinusoidal waveform. This is why
compared to operation with a commercial power there will be a slight increase in motor temperature,
noise and vibration.
High speed operation exceeds 1800 rpm (0.1 to 0.4kW: 60Hz, 0.75 to 2.2kW: 90Hz)
The vibration and the noise are getting big when operating by the setting value with the frequency
exceeds 1800rpm. In addition, please use it within the range of the frequency setting less than
allowable highest rotational speed 2500rpm. Please note the output torque, because the frequency
ambit that is 1800rpm or more is a constant power characteristic.
Low loads and low inertia loads
The motor may demonstrate instability such as abnormal vibrations or overcurrent trips at light loads of
50% or under of the load percentage, or when the load's inertia moment is extremely small. If that
happens reduce the carrier frequency.
Occurrence of instability
Unstable phenomena may occur with the load and motor combinations.
In this case, to deal with the above lower the settings of inverter carrier frequency.
Combined with couplings between load devices and motors with high backlash
When using the inverter in the above combination, use the S-pattern acceleration/deceleration function,
or adjust the speed control response.
Combined with loads that have sharp fluctuations in rotation such as piston movements
In this case, adjust the response time (inertial moment setting).
Braking a motor when cutting off power supply
A motor with its power cut off goes into free-run, and does not stop immediately. To stop the motor
quickly as soon as the power is cut off, select the IPM Gear Motors with a brake.
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General