Mitsubishi Electric FR-A720-0.4K Instruction Manual page 185

Setting of acceleration/deceleration time
and acceleration/deceleration pattern
Output frequency
(Hz)
Set
frequency
Pr. 147
Setting
Pr.7 Pr.44
Pr.110
RT signal
X9 signal
⋅
Switching frequency for each control method
Control Method
V/F control
Advanced magnetic flux vector control
Real sensorless vector control
Vector control,
encoder feedback control
CAUTION
⋅ In S-shaped acceleration/deceleration pattern A (refer to page 176), 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
4 T
×
t =
× f
2
9
(Pr. 3)
⋅ Guideline for acceleration/deceleration time when Pr. 3 Base frequency = 60Hz (0Hz to set frequency)
Frequency setting (Hz)
Acceleration/
deceleration time (s)
⋅ The RT, X9 signal can be assigned to the input terminal using any of Pr. 178 to Pr. 189 (input terminal function selection). When
terminal assignment is changed, the other functions may be affected. Set parameters after confirming the function of each
terminal.
REMARKS
⋅ The RT (X9) signal acts as the second (third) function selection signal and makes the other second (third) function valid. (Refer
to page 235)
⋅ The RT signal is assigned to the RT terminal in the default setting. By setting "3" in 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, Pr. 45, Pr. 110 and Pr. 111 settings are 0.03s or less, the acceleration/deceleration time is 0.04s
(under V/F control, Advanced magnetic flux vector control). 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 159
Pr. 10 DC injection brake operation frequency
Pr. 29 Acceleration/deceleration pattern selection
Pr. 125, Pr. 126 (frequency setting gain frequency)
Pr. 178 to Pr. 189 (input terminal function selection)
174
Pr.111 Pr.44 Pr.8
(Pr.45)
ON
ON
Switching frequency
Output frequency
Output frequency before the slip compensation
Estimated speed converted as frequency
Actual motor speed converted as frequency
5
T T: Acceleration/deceleration time setting value(s)
2
+
f : Set frequency(Hz)
9
60
5 5
15 15
Refer to page 203
Refer to page 176
Refer to page 294
Refer to page 231
Pr.44
Pr.44
Pr.7
(Pr.45)
120 200 400
12 27 102
35 82 305
Time
Pr.8