OMRON Sysdrive 3G3HV - Detector Cooling Section
OMRON Sysdrive 3G3HV - Detector Cooling Section
OMRON Sysdrive 3G3HV - Detector Cooling Section
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Notes on Using the Inverter for a Motor<br />
Using the Inverter for an Existing Standard Motor<br />
When a standard motor is operated with the Inverter, power loss is<br />
slightly higher than when operated with a commercial power supply.<br />
In addition, cooling effects also diminish in the low-speed range, resulting<br />
in an increase in the motor temperature. Therefore, the motor torque<br />
should be reduced in the low speed range.<br />
The following graph shows the allowable load characteristics of a standard<br />
motor.<br />
If 100% torque is continuously required in the low-speed range, use a<br />
special motor for use with inverters.<br />
Allowable Load Characteristics of Standard Motor<br />
24% ED (or 15 minutes)<br />
24% ED (or 15 minutes)<br />
24% ED (or 15 minutes)<br />
Torque (%)<br />
Continuous<br />
Frequency (Hz)<br />
High-speed Operation<br />
When using the motor at a high speed (60 Hz or more), problems may<br />
arise in dynamic balance and bearing durability.<br />
Torque Characteristics<br />
The motor may require more acceleration torque when the motor is operated<br />
with the Inverter than when operated with a commercial power<br />
supply. Check the load torque characteristics of the machine to be used<br />
with the motor to set a proper V/f pattern<br />
Vibration<br />
The <strong>3G3HV</strong> Series uses a high carrier PWM to reduce motor vibration.<br />
When the motor is operated with the Inverter, motor vibration is almost<br />
the same as when operated with a commercial power supply.<br />
Motor vibration may, however, become greater in the following cases.<br />
• Resonance with the natural frequency of the mechanical system<br />
Take special care when a machine that has been operated at a constant speed is to be operated<br />
in variable speed mode.<br />
If resonance occurs, install vibration-proof rubber on the motor base or use the frequency<br />
jump function to skip any frequency resonating the machine.<br />
• Imbalanced rotor<br />
Take special care when the motor is operated at a higher speed (60 Hz or more).<br />
Noise<br />
Noise is almost the same as when the motor is operated with a commercial<br />
power supply. Motor noise, however, becomes louder when the motor<br />
is operated at a speed higher than the rated speed (60 Hz).
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