# Mitsubishi Electric FR-A820-00046 Instruction Manual Page 423

Parameters
● Set the ratio (%) of time for drawing an S-shape in Pr. 380 to Pr. 383 with the acceleration time as
100%.
Parameter setting (%) = Ts / T × 100%
NOTES
At a start, the motor starts at Pr. 13 "Starting frequency" when the start signal turns ON.
If there is a difference between the speed command and speed at a start of deceleration due to
torque limit operation etc., the speed command is matched with the speed to make deceleration.
Change the X20 signal after the speed becomes constant.
S pattern operation before switching continues even if the X20 signal is changed during accelera-
tion or deceleration.
The X20 signal can be assigned to an input terminal by setting any of Pr. 178 to Pr. 189 (input ter-
minal function selection). Changing the terminal assignment may affect other functions. Set
parameters after confirming the function of each terminal.
S-pattern acceleration/deceleration D (Pr. 29 = "5", Pr. 516 to Pr. 519)
● Set the time required for S-pattern operation part of S-pattern acceleration/deceleration with
Pr. 516 to Pr. 519.
Set each S-pattern operation time for acceleration start (Pr. 516), acceleration completion (Pr. 517),
deceleration start (Pr. 518), and deceleration completion (Pr. 519).
● When S-pattern acceleration/deceleration D is set, the acceleration/deceleration time becomes
longer, as shown below. The set acceleration/deceleration time T1 indicates the actual time taken
for linear acceleration/deceleration as calculated based on Pr. 7, Pr. 8, Pr. 44, Pr. 45, Pr. 110, and
Pr. 111.
Actual acceleration time T2 =
Actual deceleration time T2 =
FR-A800
(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
S-pattern
acceleration
Linear
acceleration
Ts
Ts
T
Set acceleration time T1 + (S-pattern time at start of acceleration
Set deceleration time T1 + (S-pattern time at start of deceleration
Fig. 5-94:
Parameter setting
+ S-pattern time at completion of acceleration)
2
+ S-pattern time at completion of deceleration)
2
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