
102
Setting of acceleration/deceleration time
and acceleration/deceleration pattern
(2) Deceleration time setting
(Pr. 8, Pr. 20)
⋅
Use
Pr. 8 Deceleration time
to set the deceleration time required to reach 0Hz from
Pr. 20 Acceleration/deceleration
reference frequency
.
⋅
Set the deceleration time according to the following formula.
(3) Change the setting range and increments of the acceleration/deceleration time
(Pr. 21)
⋅
Use
Pr. 21
to set the acceleration/deceleration time and minimum setting range.
Setting
"
0
"
(initial value) ..................... 0 to 3600s (minimum setting increments 0.1s)
Setting
"
1
"
.......................................... 0 to 360s (minimum setting increments 0.01s)
(4) Set multiple acceleration/deceleration time (RT signal,
Pr. 44, Pr. 45, Pr. 147
)
⋅
The
Pr. 44
and
Pr. 45
settings become valid when the RT signal turns ON or the output frequency reaches the value
of
Pr. 147
setting or higher.
⋅
When "9999" is set in
Pr. 45
, the deceleration time becomes equal to the acceleration time
(Pr. 44)
.
⋅
By setting
Pr. 147
, acceleration/deceleration time can be automatically changed at turn-OFF of the RT signal.
(1) Acceleration time setting
(Pr. 7, Pr. 20)
⋅
Use
Pr. 7 Acceleration time
to set the acceleration time required to reach
Pr. 20
Acceleration/deceleration reference frequency
from 0Hz.
⋅
Set the acceleration time according to the following formula.
Example) How to find the setting value for
Pr. 7
when increasing the output
frequency to the maximum frequency of 50Hz in 10s with
Pr. 20
=
60Hz (initial setting) and
Pr. 13
= 0.5Hz.
Example) How to find the setting value for
Pr. 8
when decreasing the output
frequency from the maximum frequency of 50Hz in 10s with
Pr. 20
=
120Hz and
Pr. 10
= 3Hz.
CAUTION
⋅
Changing the
Pr. 21
setting changes the acceleration/deceleration time setting
(Pr. 7, Pr. 8, Pr. 16, Pr. 44, Pr. 45)
.
(The
Pr. 611
Acceleration time at a restart
setting is not affected.)
<Example>
When
Pr. 21
= "0", setting "5.0" s in
Pr. 7
and "1" in
Pr. 21
automatically changes the
Pr. 7
setting to "0.5" s.
Pr. 147
setting
Acceleration/deceleration time
Description
9999 (initial value)
Pr. 7, Pr. 8
Acceleration/deceleration time is not
automatically changed.
0.00Hz
Pr.44, Pr. 45
Second acceleration/deceleration time is applied
from the start.
0.01Hz
≤
Pr. 147
≤
set frequency
Output frequency <
Pr. 147
:
Pr. 7, Pr. 8
Pr. 147
≤
output frequency:
Pr. 44, Pr. 45
Acceleration/deceleration time is automatically
changed. *
Set frequency <
Pr. 147
Pr. 7, Pr. 8
Not changed as the frequency has not reached
the switchover frequency.
* Even if the output frequency is lower than the
Pr. 147
setting, the acceleration/deceleration time is changed to the second acceleration/
deceleration time by the RT signal.
Acceleration
time setting
=
Pr.20
×
Acceleration time from stop to
maximum operating frequency
Maximum operating
frequency -
Pr. 13
Running
frequency
Acceleration
time
Deceleration
time
Time
Pr.20
Pr.7
Pr.8
Output
frequency
(Hz)
(60Hz)
Pr.7
=
60Hz
×
10s
12.1s
50Hz - 0.5Hz
Deceleration
time setting
=
Pr. 20
×
Deceleration time from maximum
operating frequency to stop.
Maximum operating
frequency -
Pr. 10
Pr. 8
=
120Hz
×
10s
25.5s
50Hz - 3Hz
Time
Output frequency
(Hz)
Set
frequency
Pr. 147
Setting
Pr.7
Pr.44
Pr.44
(Pr.45)
Pr.8
Pr.7
Pr.44
Pr.44
(Pr.45)
Pr.8
RT signal
ON
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