Mitsubishi Electric 700 Series Instruction Manual page 123

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).
Acceleration/deceleration time changes when the RT signal turns ON or when the output frequency reaches the Pr.147
setting or higher.
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 120), 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
Guideline for acceleration/deceleration time at the Pr. 3 Base frequency of 60Hz (0Hz to set frequency)
REMARKS
The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 143)
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 mechanical 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
118
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
Set frequency
Slope set
by Pr.7
Acceleration time
T 5
2
× f T
+
2
9
(Pr. 3)
Frequency setting (Hz)
Acceleration/
deceleration time (s)
5
15
Refer to page 107
Refer to page 135
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
Slope set Slope set Slope set
by Pr.44 by Pr.44 by Pr.8
(Pr.45)
Deceleration time
T: Acceleration/deceleration time setting (s)
f: Set frequency (Hz)
60
5
15
Refer to page 120
Description
Pr.147 setting
Time
120 200 400
12 27 102
35 82 305