How To Select The Right Ac Motor Drive - Delta C2000 series User Manual

Chapter 17 How to Select the Right
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.
Item
Friction load and weight
load
Liquid (viscous) load
Load type
Inertia load
Load with power
transmission
Constant torque
Load speed and
Constant output
torque
Decreasing torque
characteristics
Decreasing output
Constant load
Shock load
Load
Repetitive load
characteristics
High starting torque
Low starting torque
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
Chapter 12 Description of Parameter Settings|C2000 Series
17-1 Capacity formula
17-2 General Precautions
17-3 How to choose a suitable motor
Speed and torque
characteristics
17-1
AC Motor Drive
Related Specification
Time
ratings
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Overload Starting
capacity torque
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