Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 359

• For example, the following table shows the actual acceleration time when starting the inverter by selecting S-pattern
acceleration/deceleration D from a stop to 60 Hz, as shown below, with the initial parameter settings.
Pr. 516
Linear acceleration
Pr. 516/2
Slope of Pr. 7, Pr. 44, Pr. 110
T1
T2
Set acceleration time T1 = (set frequency - Pr.13) × Pr.7 / Pr.20
Actual acceleration time T2 = set acceleration time T1 + (Pr.516 + Pr.517) / 2
• The following table shows the actual deceleration time when stopping the inverter by selecting S-pattern acceleration/
deceleration D from operation to 0 Hz, as shown below, with the initial parameter settings.
Acceleration/
Pr.518
deceleration
reference
frequency
Pr.518/2
(Pr. 20)
Set deceleration time T1 = (set frequency - Pr.10 DC injection brake operation frequency) × Pr.8 / Pr.20
Actual deceleration time T2 = set deceleration time T1 + (Pr.518 + Pr.519) / 2
NOTE
• When acceleration/deceleration time (such as Pr.7 and Pr.8) is set to "0 s" under Real sensorless vector control, Vector
control, and PM sensorless vector control (with MM-CF and Pr.788 Low speed range torque characteristic selection
="9999 (initial value)"), linear acceleration and deceleration are performed for the S-pattern acceleration/deceleration A to D
and backlash measures (Pr.29 ="1 to 5").
• Set linear acceleration/deceleration (Pr.29 ="0 (initial setting)") when torque control is performed under Real sensorless vector
control or Vector control. When acceleration/deceleration patterns other than the linear acceleration/deceleration are selected,
the protective function of the inverter may be activated.
358
5. PARAMETERS
5.8 (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Pr. 517
Acceleration/deceleration
reference frequency (Pr. 20)
Pr. 517/2
Starting frequency
(Pr. 13)
= (60 Hz - 0.5 Hz) × 5 s / 60 Hz
4.96s (actual acceleration time at linear acceleration)
= 4.96 s + (0.1 s + 0.1 s) / 2
= 5.06 s (acceleration time at S-pattern acceleration)
Linear deceleration
Pr. 8, Pr. 45, Pr. 111
Pr.519
Pr.519/2
DC injection
brake operation
frequency
T1
(Pr. 10)
T2
= (60 Hz - 3 Hz) × 5 s / 60 Hz
4.75 s (actual deceleration time at linear deceleration)
= 4.75 s + (0.1 s + 0.1 s) / 2
= 4.85 s (deceleration time at S-pattern deceleration)