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Setting of acceleration/deceleration time
and acceleration/deceleration pattern
4
PARAMETERS
(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, X9 signal, Pr. 44, Pr. 45, Pr. 110, Pr. 111,
Pr. 147)
⋅ Pr. 44 and Pr. 45 are valid when the RT signal is ON, or the output frequency reaches or exceeds the setting of Pr.
147. Pr. 110 and Pr. 111 are valid when the X9 signal is ON. When the RT signal (X9 signal) turns ON, the
acceleration/deceleration time switches to the second (third) acceleration/deceleration time even when the output
frequency has not reached the Pr. 147 setting. Priority of switching is X9 signal > RT signal > Pr. 147 setting.
⋅ For the terminal used for X9 signal input, set "9" in any of Pr. 178 to Pr. 189 (input terminal function selection) to assign
the function.
⋅ When "9999" is set in Pr. 45 or Pr. 111, the deceleration time becomes equal to the acceleration time (Pr. 44, Pr. 110).
⋅ When Pr. 110 = "9999", third acceleration/deceleration time is invalid.
⋅ If the Pr. 147 setting is lower than Pr. 10 DC injection brake operation frequency or Pr. 13 Starting frequency setting, the
acceleration/deceleration time switches to the Pr. 44 (Pr. 45) setting when the output frequency exceeds the Pr. 10 or
Pr. 13 setting.
(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 value) 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, Pr. 110, Pr. 111, Pr.
264, Pr. 265).
(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
No automatic switching of the acceleration/
deceleration time
0.00Hz Pr. 44, Pr. 45 Second acceleration/deceleration time from a 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 automatic switching
Set frequency < Pr. 147 Pr. 7, Pr. 8
No automatic switching, since output frequency will
not reach the switching frequency
Running
frequency
Acceleration
time
Deceleration
time
Time
Pr.20
Pr.7
Pr.8
Output
frequency
(Hz)
Pr.110
Pr.111
Pr.44
Pr.45
(60Hz)
Acceleration
time setting
=
Pr. 20
×
Acceleration time from stop to
maximum operating frequency
Maximum operating
frequency - Pr. 13
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