Acceleration/Deceleration Pattern (Pr. 29, Pr. 140 To Pr. 143) - Mitsubishi F700 Series Instruction Manual

Setting of acceleration/deceleration time
and acceleration/deceleration pattern
4.7.3

Acceleration/deceleration pattern (Pr. 29, Pr. 140 to Pr. 143)

You can set the acceleration/deceleration pattern suitable for application.
You can also set the backlash measures that stop acceleration/deceleration once at the parameter-set
frequency and time during acceleration/deceleration.
Parameter
Number
Acceleration/deceleration pattern
29
selection
140 Backlash acceleration stopping frequency
141 Backlash acceleration stopping time
142 Backlash deceleration stopping frequency
143 Backlash deceleration stopping time
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 185)
Setting value "0"
[Linear acceleration
/ deceleration]
Time
Setting value "1"
[S-pattern acceleration
/deceleration A]
fb
Time
CAUTION
 As the acceleration/deceleration time of S-pattern acceleration/deceleration A, set the time taken until Pr. 3 Base frequency
is reached, not Pr. 20 Acceleration/deceleration reference frequency.
98
Name
(1) Linear acceleration/ deceleration (Pr. 29 = "0", initial value)
 When the frequency is changed for acceleration, deceleration, etc. in inverter
operation, the output frequency is changed linearly (linear acceleration/
deceleration) to reach the set frequency without straining the motor and
inverter. Linear acceleration/deceleration has a uniform frequency/time slope.
(2) S-pattern acceleration/deceleration A (Pr. 29 = "1")
 For machine tool spindle applications, etc.
Used when acceleration/deceleration must be made in a short time to a high-
speed range of not lower than the base frequency. In this acceleration/
deceleration pattern, Pr. 3 Base frequency (fb) is the inflection point of the S
pattern and you can set the acceleration/deceleration time appropriate for motor
torque reduction in a constant-power operation range of base frequency (fb) or
higher.
Initial Setting
Value Range
0 Linear acceleration/ deceleration
1 S-pattern acceleration/deceleration A
2 S-pattern acceleration/deceleration B
0
3 Backlash measures
Variable-torque acceleration/
6
deceleration
1Hz 0 to 400Hz
Set the stopping frequency and time
0.5s 0 to 360s
for backlash measures.
1Hz 0 to 400Hz
Valid when Pr. 29 = 3
0.5s 0 to 360s
Description