Fuji Electric FRENIC-AQUA series, User Manual

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3.1 Selecting Motors and Inverters
3-5
Chap. 3
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(3) Deceleration time (For detailed calculation, refer to Section 3.1.3.2)
To calculate the deceleration time, check the motor deceleration torque characteristics for the
whole range of speed in the same way as for the acceleration time.
1) Calculate the total moment of inertia for the load and motor
Same as for the acceleration time.
2) Calculate the required minimum deceleration torque (See Figures 3.5 and 3.6.)
Same as for the acceleration time.
3) Calculate the deceleration time
Assign the value calculated above to the equation (3.11) to calculate the deceleration time in
the same way as for the acceleration time. If the calculated deceleration time is longer than
the requested time, select the inverter and motor having one class higher capacity and
calculate it again.
Figure 3.5 Example Study of Minimum
Deceleration Torque (1)
Figure 3.6 Example Study of Minimum
Deceleration Torque (2)