Mitsubishi Electric FR-E700 Instruction Manual page 106

Setting of acceleration/deceleration time and acceleration/ deceleration pattern
(4) Set two kinds of acceleration/deceleration times (RT signal, Pr. 44, Pr. 45, 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.
When "9999" is set to Pr. 45, the deceleration time becomes equal to the acceleration time (Pr. 44).
For the RT signal, set "3" in any of Pr. 178 to Pr. 184 (input terminal function selection) to assign the function.
When RT signal is OFF, automatic switching of the acceleration/deceleration time is available with Pr. 147.
Pr. 147 Setting
9999 (initial value)
0.00Hz
0.00Hz ≤ Pr. 147 ≤ Set frequency
Set frequency < Pr. 147
* When the RT signal turns on, the acceleration/deceleration time switches to the second acceleration/deceleration time even when the output frequency is
not reached to Pr. 147 setting.
NOTE
When the acceleration/deceleration pattern is S-pattern acceleration/deceleration A (refer to page 105), the acceleration/
deceleration time is the time required to reach Pr. 3 Base frequency .
Acceleration/deceleration time formula when the set frequency is the base frequency or higher
4
×
t=
9
(Pr. 3)
Guideline for acceleration/deceleration time at the Pr. 3 Base frequency of 50Hz (0Hz to set frequency)
Changing terminal assignment may affect the other functions. Make setting after confirming the function of each
terminal.
REMARKS
The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 133)
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.
Any value can be set to the acceleration/deceleration time but the actual motor acceleration/deceleration time cannot be made shorter
than the shortest acceleration/deceleration time determined by the mecanical system J (moment of inertia) and motor torque.
Parameters referred to
Pr. 3 Base frequency
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. 184 (input terminal function selection)
Acceleration/Deceleration Time
Pr. 7, Pr. 8
Pr. 44, Pr. 45
Output frequency < Pr. 147: Pr. 7, Pr. 8
Pr. 147 ≤ Output frequency: Pr. 44, Pr. 45
Pr. 7, Pr. 8
Output frequency
(Hz)
Set
frequency
Pr. 147
setting
Pr. 7 Pr. 44
Acceleration time
T 5
T: Acceleration/deceleration time setting (s)
2
× f T
+
2 f: Set frequency (Hz)
9
Frequency setting (Hz)
Acceleration/
deceleration time (s)
5
15
Refer to page 90
Refer to page 120
Refer to page 105
Refer to page 170
Refer to page 130
Description
No automatic switching of the acceleration/deceleration
time
Second acceleration/deceleration time from a start
Acceleration/deceleration time automatic switching ∗
No automatic switching, since output frequency will not
reach the switching frequency
Time
Pr. 44 Pr. 8
(Pr. 45)
Deceleration time
50 120 200
5 16 38
15 47 115
400
145
429
4
103