Mitsubishi Electric FR-D720S SC EC Instruction Manual page 211

Parameter
Set two kinds of acceleration/deceleration times (RT signal, Pr. 44, Pr. 45)
Pr. 44 and Pr. 45 are valid when the RT signal is on. Switching the parameter sets allows you
to operate motors with different specifications and capabilities with the frequency inverter.
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. 182 "Input terminal function selection" to assign
the function.
S-shaped acceleration/deceleration pattern
If a S-shaped acceleration/deceleration pattern A is selected in pr. 29, 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 =
9
T: Acceleration/deceleration time setting value (s)
f: Set frequency (Hz)
NOTE You will find a detailed description of this parameter in section 6.6.3.
Guideline for acceleration/deceleration time when Pr. 3 Base frequency = 50Hz (0Hz to set fre-
quency).
Acceleration/deceleration
Tab. 6-4: Acceleration/deceleration time at a base frequency of 50Hz
NOTES
Changing terminal assignment may affect the other functions. Make setting after confirming
the function of each terminal. (Refer to section 6.9.3.)
If the Pr. 20 setting is changed, the Pr. 125 and Pr. 126 (frequency setting signal gain fre-
quency) settings do not change. Set Pr. 125 and Pr. 126 to adjust the gains.
When the Pr. 7, Pr. 8, Pr. 44 or Pr. 45 settings are 0.03s or less, the acceleration/decelera-
tion 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 (inertia moment) and motor torque.
FR-D700 SC EC
T
5
2
×
------------------- -
f + -- - T
2
9
( )
Pr. 3
time [s]
5
15
Frequency Setting [Hz]
50 120
5 16
15 47
Acceleration and deceleration
200 400
38 145
115 435
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