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

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Parameters (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
FR-A800 5 - 253
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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.
I002560E
Fig. 5-98: Actual deceleration time when stopping
Set deceleration time T1 = (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)
Actual deceleration time T2 = 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)
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.
Linear deceleration
Pr. 8, Pr. 45, Pr. 111
DC injection
brake
operation
frequency
(Pr. 10)
Pr. 518
Pr. 519
Pr. 519/2
Pr. 518/2
Acceleration/
deceleration
reference
frequency
(Pr. 20)
T1
T2