Mitsubishi Electric 800 Series Instruction Manual page 196

 S-pattern acceleration/deceleration A (Pr.29 = "1")
• Use this when acceleration/deceleration is required for a short time until a high-speed area equal to or higher than the base
frequency, such as for the main shaft of the machine.
• The acceleration/deceleration pattern has the Pr.3 Base frequency (Pr.84 Rated motor frequency under PM motor
control) (fb) as the point of inflection in an S-pattern curve, and the acceleration/deceleration time can be set to be suitable
for the motor torque reduction in the constant-power operation range at the base frequency (fb) or more.
[S-pattern acceleration
/deceleration A]
fb
Time
• Acceleration/deceleration time calculation method when the set frequency is equal to or higher than the base frequency
Acceleration time t = (4/9)  (T/fb
Where T is the acceleration/deceleration time (s), f is the set frequency (Hz), and fb is the base frequency (rated motor
frequency)
• Reference (0 Hz to set frequency) of acceleration/deceleration time when Pr.3 = "60 Hz"
Acceleration/deceleration time (s)
5
15
NOTE
• For the acceleration/deceleration time setting of the S-pattern acceleration/deceleration A, set the time to Pr.3 (Pr.84 under
PM motor control) instead of Pr.20 Acceleration/deceleration reference frequency.
 S-pattern acceleration/deceleration B (Pr.29 = "2")
• This is useful for preventing collapsing stacks such as on a conveyor. S-pattern acceleration/deceleration B can reduce
the impact during acceleration/deceleration by accelerating/decelerating while maintaining an S-pattern from the present
frequency (f2) to the target frequency (f1).
[S-pattern acceleration
/deceleration B]
f1
f2
Time
NOTE
• When the RT signal turns ON during acceleration or deceleration with the S-pattern acceleration/deceleration B enabled,
a pattern of acceleration or deceleration changes to linear at the moment.
2 2
)  f + (5/9)  T
Set frequency (Hz)
60 120
5 12 27
15 35 82
5.5 (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
200 400
102
305
3
4
5
5
5
6
7
8
9
10
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5. PARAMETERS