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E6581381
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 shown below. | |
1 | ||
⋅ Combined with a motor that exceeds applicable motor ratings recommended for the inverter | ||
⋅ Combined with special motors |
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
⋅ Combined with loads that have sharp fluctuations in rotation such as piston movements In this case, please do not use this inverter.
Braking a motor when cutting off power supply
A motor with its power cut off goes into
Load that produces regenerative torque
Do not use the inverter in combination with a load, such as an air conditioner, that produces regenerative torque. Or the overvoltage or overcurrent protection circuit of the inverter may be activated, causing the inverter to trip. If overvoltage tripping occurs during deceleration, lengthen the deceleration time.