YASKAWA FSDrive-MV1000 Series, Instructions For Use Manual

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i.5 Notes on Motor Operation
YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions 21
i.5 Notes on Motor Operation
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Existing Standard Motors
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Insulation Voltage
Consider voltage tolerance levels and insulation in applications with high input voltage or particularly long wiring
distances. Contact Yaskawa for consultation.
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High Speed Operation
Running a motor beyond its rated speed may lead to problems imposed by vibration or the durability of motor bearings.
Contact the manufacturer of the motor for details.
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Torque Characteristics
Torque characteristics differ compared to operating the motor directly from line power. The user should have a full
understanding of the load torque characteristics for the application.
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Vibration and Shock
The FSDrive-MV1000 PWM control with multiple outputs reduces motor oscillation to the same level as in operation by
commercial power supply. However, the motor oscillation is slightly larger due to the following factors:
• Resonance with the natural frequency of the mechanical system
Take particular caution when adding a variable speed drive to an application running a motor from line power at a
constant speed. If resonance occurs, install shock-absorbing rubber around the base of the motor and enable the Jump
frequency selection to prevent continuous operation in the resonant frequency range.
• Residual unbalance of the rotating motor
Particular care is required when running the motor beyond its rated speed.
• Subsynchronous Resonance
Subsynchronous resonance can occur with long motor shafts and in applications such as turbines, blowers, and fans
with high inertia loads. Use Closed Loop Vector Control when these applications experience mechanical resonance
problems.