96
Setting of acceleration/deceleration time
and acceleration/deceleration pattern
CAUTION
In S-shaped acceleration/deceleration pattern A (refer to page 98), the set time is the period required to reach the base
frequency set in Pr. 3 Base frequency.
Acceleration/deceleration time formula when the set frequency is the base frequency or higher
The RT signal can be assigned to the input terminal using any of Pr. 178 to Pr. 189 (Input terminal function selection). Changing
the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Set
parameters after confirming the function of each terminal.
REMARKS
The RT signal acts as the second function selection signal and makes the other second function valid. (Refer to page 120)
The RT signal is assigned to the RT terminal in the default setting. By setting "3" to any of Pr. 178 to Pr. 189 (Input terminal
function selection), you can assign the RT signal to the other terminal.
If the Pr. 20 setting is changed, the Pr. 125 and Pr. 126 (frequency setting signal gain frequency) settings do not change. Set Pr.
125 and Pr. 126 to adjust the gains.
When the Pr. 7, Pr. 8, Pr. 44 and Pr. 45 settings are 0.03s or less, the acceleration/deceleration time is 0.04s. At that time, set
Pr. 20 to "120Hz" or less.
If the acceleration/deceleration time is set, the actual motor acceleration/deceleration time cannot be made shorter than the
shortest acceleration/deceleration time determined by the mechanical system J (moment of inertia) and motor torque.
Parameters referred to
Pr. 3 Base frequency Refer to page 82
Pr. 10 DC injection brake operation frequency Refer to page 106
Pr. 29 Acceleration/deceleration pattern selection Refer to page 98
Pr. 125, Pr. 126 (Frequency setting gain frequency) Refer to page 172
Pr. 178 to Pr.189 (Input terminal function selection) Refer to page 117
Pr. 999 Automatic parameter setting Refer to page 305
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
Guideline for acceleration/deceleration time when Pr. 3 Base frequency = 50Hz (0Hz to set frequency)
t =
4
T
f
2
+
5
T
T: Acceleration/deceleration time setting value(s)
f : Set frequency(Hz)
9
(Pr.3)
2
9
Frequency setting (Hz)
50 120 200 400
Acceleration/
deceleration time (s)
5 5 16 38 145
15 15 47 115 429
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