239
PARAMETER
2
P
ARAM
ETE
R
2) S-pattern acceleration/deceleration B [
Pr. 29 = 2
]
S-pattern acceleration/deceleration B is for
accelerating/decelerating in S-pattern when set
frequency is changed (running frequency by
external input signal or operation panel). Therefore
reducing an impact during start or stop, and effective
for load collapse prevention. For example, when set
frequency changes as the following diagram, S-
pattern is active. (Example: conveyor)
3) S-pattern acceleration/deceleration C [
Pr. 29 = 4, Pr.
380 to 383
]
Assign S-pattern acceleration/deceleration C
switching signal (X20) to an input terminal, and use
S-pattern acceleration/deceleration C switching
signal (X20) to switch the acceleration/ deceleration
curve.
Change the S-pattern acceleration/deceleration C
switch (X20 signal) after the speed becomes
constant. S-pattern operation before switching
continues even if the X20 signal is changed during
acceleration or deceleration.
Set % of time taken for forming an S-pattern in [
Pr.
380, 383
] as acceleration/deceleration time is
100%.
4) S-pattern acceleration/deceleration D [
Pr. 29 = 5,
Pr. 516 to 519
]
Set the time taken for S-pattern operation of S-
pattern acceleration/deceleration using [
Pr. 516 to
519
].
Even if the start signal is turned OFF during
acceleration, the inverter will not decelerate
immediately to avoid sudden frequency change.
(Likewise, the inverter will not immediately
accelerate when deceleration is changed to
reacceleration by turning the start signal ON
during deceleration, etc.)
When S-pattern acceleration/deceleration D is
set, acceleration/deceleration time will become
longer as follows:
The set acceleration/deceleration time T1
indicates the time taken for actual linear
acceleration/deceleration calculated based on [
Pr.
7, 8, 44, 45, 110 or 111
].
S-pattern acceleration/deceleration B
X20 Signal
During acceleration
During
deceleration
OFF
[
Pr. 380 Acceleration S-
pattern 1
]
[
Pr. 381 Deceleration S-
pattern 1
]
ON
[
Pr. 382 Acceleration S-
pattern 2
]
[
Pr. 383 Deceleration S-
pattern 2
]
common
f
2
f
1
Output frequency
(Hz)
Time
A700
[
Pr.382
]
[
Pr.383
]
[
Pr.381
]
S-pattern
acceleration/
deceleration
C switchover
(X20)
OFF
OFF
ON
Output frequency
Output frequency
Output frequency
Set frequency
Set frequency
Set frequency
[
Pr.380
]
Frequency
Time
S-pattern
acceleration
Linear acceleration
Ts
T
Ts
Parameter setting (%)
㧩
Ts/T 100%
Actual acceleration time T2 = set acceleration time T1+
(S-pattern time at a start of accele S-pattern time at a
completion of acceleration)/2
Actual deceleration time T2 = set deceleration time T1+
(S-pattern time at a start of decele S-pattern time at a
completion of deceleration)/2
[Example]When starting the inverter with an S-pattern
acceleration/deceleration D selected from a stop to
60Hz in the parameter initial setting as shown below
A700
[
Pr.516
]
Time
ON
ON
ON
Start signal
Start signal
Start signal
[
Pr.517
]
[
Pr.518
]
[
Pr.519
]
Output
frequency
Output
frequency
Output
frequency
T2
T1
Starting frequency [
Pr.13
]
[
Pr.517
] /2
[
Pr.517
]
[
Pr.516
]
[
Pr.516
] /2
Linear acceleration
slope of [
Pr.7
]
Set frequency
Set frequency
Set frequency
Set acceleration
time T2
= 4.96s + (0.1s + 0.1s)/2
= (60Hz - 0.5Hz) 5s/60Hz
= 5.06s(acceleration time at S-pattern
acceleration)
= set acceleration time T1 +
([
Pr. 516
] + [
Pr. 517
])/2
4.96s (actual acceleration time
at linear acceleration)
Set acceleration
time T1
= (Set frequency - [
Pr. 13
])
[
Pr. 7
] / [
Pr. 20
]
Summary of Contents for FR-A700 Series
Page 245: ...279 2 PARAMETER PARAMETER MEMO ...
Page 440: ...474 PARAMETER MEMO ...
Page 522: ...556 SELECTION MEMO ...
