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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
Set frequency
Pr.147 setting
Time
Output
frequency
(Hz)
Slope set
by Pr.7
Slope set
by Pr.44
Slope set
by Pr.44
(Pr.45)
Slope set
by Pr.8
Acceleration time Deceleration time