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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 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
0.00Hz ≤ 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
∗ 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
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 Refer to page 107
Pr. 10 DC injection brake operation frequency
Refer to page 135
Pr. 29 Acceleration/deceleration pattern selection
Refer to page 120
Set frequency
Pr.147 setting
Time
Output
frequency
(Hz)
Slope set
by Pr.7
Slope set
by Pr.44
Slope set
by Pr.44
(Pr.45)
Slope set
by Pr.8
Acceleration time Deceleration time
Guideline for acceleration/deceleration time at the Pr. 3 Base frequency of 60Hz (0Hz to set frequency)
t=
4
×
T
× f
2
+
5
T
T: Acceleration/deceleration time setting (s)
f: Set frequency (Hz)
9
(Pr. 3)
2
9
Frequency setting (Hz)
60 120 200 400
Acceleration/
deceleration time (s)
5 5 12 27 102
15 15 35 82 305