Mitsubishi Electric FR-A700 Technical Manual page 204

2.5.4 S-pattern acceleration/deceleration and backlash measures
[Pr. 29, 140 to 143*, 380 to 383
[Pr.] Name
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
380 Acceleration S-pattern 1
381 Deceleration S-pattern 1
382 Acceleration S-pattern 2
383 Deceleration S-pattern 2
516 S-pattern time at a start of acceleration
517 S-pattern time at a completion of acceleration
518 S-pattern time at a start of deceleration
519 S-pattern time at a completion of deceleration
(1) S-pattern acceleration/deceleration [Pr. 29,
380 to 383, 516 to 519]
Generally, frequency/time gradient of acceleration/
deceleration is a constant linear acceleration/
deceleration [Pr. 29 = 0 (initial value)]. This
acceleration/deceleration gradient can be changed
into S-pattern.
When the acceleration/deceleration time ([Pr. 7, 8]
setting, etc.) setting under Real sensorless vector
control or vector control is 0s, the S-pattern
acceleration/deceleration A to D ([Pr. 29 = 1, 2, 4, 5]) is
linear acceleration/deceleration.
Set linear acceleration/deceleration ([Pr. 29 = 0 (initial
value)]) when torque control is exercised 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 function.
1) S-pattern acceleration/deceleration A [Pr. 29 = 1]
common
In S-pattern acceleration/deceleration pattern,
acceleration is maximum around [Pr. 3 Base
frequency] (fb) as follows. Therefore using motor
torque effectively, acceleration is fast for larger
motor torque range, and slow for smaller motor
torque range.
Effective for shortening the time taken to reach
constant-power range where motor torque is
small, when comparing with linear acceleration/
deceleration pattern. (Example: for machine tool)
* , 516 to 519
(*[Pr. 380 to 383, 516 to 519] are not available for
(*[Pr. 140 to 143, 380 to 383, 516 to 519] are not available for
Initial Setting
Value Range
0
1
2
0
3
4
5
1Hz 0 to 400Hz
0.5s 0 to 360s
1Hz 0 to 400Hz
0.5s 0 to 360s
0 0 to 50%
0 0 to 50%
0 0 to 50%
0 0 to 50%
0.1s 0.1 to 2.5s Valid when S-pattern acceleration/deceleration D
0.1s 0.1 to 2.5s
0.1s 0.1 to 2.5s
0.1s 0.1 to 2.5s
common
* ]
(common)
Description
Linear acceleration/ deceleration
S-pattern Acceleration/Deceleration A
S-pattern Acceleration/Deceleration B
Backlash measures
S-pattern Acceleration/Deceleration C
S-pattern Acceleration/Deceleration D
Set the stopping frequency and time for backlash
measures.
Valid when [Pr. 29 = 3]
Valid when S-pattern acceleration/deceleration C
[Pr. 29 = 4] is set.
Set the time taken for S-pattern from starting of
acceleration/deceleration to linear acceleration
as % to the acceleration/deceleration time ([Pr.7,
8], etc.).
An acceleration/deceleration pattern can be
changed with the X20 signal.
[Pr. 29 = 5] is set.
Set the time taken for S-pattern acceleration/
deceleration (S-pattern operation).
fmax
fb
Accel/decel
time setting
S-pattern acceleration/deceleration A
As for the acceleration/deceleration time settings
([Pr. 7, 8, 16, 44, 45, 110, 111]) for S-pattern
acceleration/deceleration A, set the time taken
until [Pr.3 Base frequency] is reached, not [Pr. 20
Acceleration/deceleration reference frequency]. Refer
to the following expression when set frequency is
[Pr. 3 Base frequency] or more.
4
t =
9
T: Acceleration/deceleration time setting (s)
f: Set frequency (Hz)
Guideline for acceleration/deceleration time (0Hz
to set frequency) at [Pr. 3 Base frequency = 60Hz]
Setting Value of
Acceleration/
Deceleration time (s)
5
15
238
PARAMETER
E700
Available Inverters
A700
F700
-—
—
—
S-pattern A
Linear ramp
Time
T
5
2
+
f T
2
9
([Pr. 3])
Set frequency (Hz)
60 120 200
5 12 27
15 35 82
.)
F700
.)
D700
E700
D700
-—
—
—
—
400
102
305