Mitsubishi Electric FR-A820-00046 Instruction Manual page 425

Parameters
● 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.
Fig. 5-97:
Set deceleration time T1
Actual deceleration time T2
NOTES 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 decel-
eration 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 value)") 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.
FR-A800
(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Acceleration/
Pr. 518
deceleration
reference
frequency
Pr. 518/2
(Pr. 20)
Actual deceleration time when stopping
= (Set frequency – Pr. 10) × Pr. 8 / Pr. 20
= (60 Hz - 3 Hz) × 5 s / 60 Hz
= 4.75 s (actual deceleration time at linear deceleration)
= Set deceleration time T1 + (Pr. 518 + Pr. 519) / 2
= 4.75 s + (0.1 s + 0.1 s) / 2
= 4.85 s (deceleration time at S-pattern deceleration)
Linear deceleration
Pr. 8, Pr. 45, Pr. 111
Pr. 519
Pr. 519/2
DC injection
brake
operation
T1
frequency
(Pr. 10)
T2
I002560E
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