Delta C200 Series User Manual page 22

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Chapter 3 How to Select the Right AC
The choice of the right AC motor drive for the application is very important and has great influence on its
lifetime. If the capacity of AC motor drive is too large, it cannot offer complete protection to the motor and
motor maybe damaged. If the capacity of AC motor drive is too small, it cannot offer the required
performance and the AC motor drive maybe damaged due to overloading.
But by simply selecting the AC motor drive of the same capacity as the motor, user application
requirements cannot be met completely. Therefore, a designer should consider all the conditions,
including load type, load speed, load characteristic, operation method, rated output, rated speed, power
and the change of load capacity. The following table lists the factors you need to consider, depending on
your requirements.
Load type
Load speed and
torque characteristics
Load characteristics
Continuous operation, Short-time operation
Long-time operation at medium/low speeds
Maximum output current (instantaneous)
Constant output current (continuous)
Maximum frequency, Base frequency
Power supply transformer capacity or percentage
impedance
Voltage fluctuations and unbalance
Number of phases, single phase protection
Frequency
Mechanical friction, losses in wiring
Duty cycle modification
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Chapter 3 How to Select the Right AC Motor Drive|C200 Series
Item
Friction load and weight load
Liquid (viscous) load
Inertia load
Load with power transmission
Constant torque
Constant output
Decreasing torque
Decreasing output
Constant load
Shock load
Repetitive load
High starting torque
Low starting torque
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Related Specification
Speed and
torque Time ratings
characteristics
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Motor Drive
Overload Starting
capacity torque
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