10-10
Motor Application Precautions
This section provides precautions for motor application.
Using the MxC to Run an Existing Standard Motor
When a standard motor is operated with the MxC, power loss is slightly higher than when operated with a
commercial power supply. Observe the following precautions when using the MxC to operate an existing stan-
dard motor.
Low Speed Ranges
Cooling effects diminish in the low-speed range, resulting in higher motor temperatures. The motor torque
should be reduced in the low-speed range whenever using a non-Yaskawa motor. If 100% torque is required
continuously at low speeds, consider using a special inverter or vector motor.
Installation and Voltage Tolerance
Considerations must be made for the motor insulation voltage when the input voltage is high (440 V or higher)
or the motor wiring is too long. Contact your Yaskawa representative for more details.
Operating at High Speeds
When using the motor at a high speed (60 Hz or more), problems may arise in dynamic balance and bearing
durability. Contact your Yaskawa representative for more details.
Torque Characteristics
The motor may require more acceleration torque when the motor is operated with the MxC than when oper-
ated with a commercial power supply. Check the load torque characteristics of the machine to be used with the
motor to set a proper V/f pattern.
Resonance with the Natural Frequency of the Mechanical System
Take special care when a machine that has been operated at a constant speed is to be operated in Variable
Speed Mode. If there are any problems with resonance, then install oscillation-proof rubber on the motor base
or use the frequency jump function to skip any resonant frequencies in the application.
Imbalanced Rotor
Take special care when the motor is operated at a high speeds (60 Hz or more).
Noise
Noise varies with the carrier frequency. At high carrier frequencies, the noise is almost the same when the
motor is operated with a commercial power supply. Motor noise, however, becomes louder when the motor is
operated at a speed higher than the rated speed (60 Hz).
To Next Page
Loading...
Need help?
General
