Mitsubishi Electric FR-A700 Instruction Manual page 378

Acceleration and deceleration
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)
NiOTE For a detailed description of Pr. 29 please refer to section 6.11.3.
Guideline for acceleration/deceleration time when Pr. 3 "Base frequency" = 50Hz (0Hz to set fre-
quency).
Acceleration/deceleration
Tab. 6-40: Acceleration/deceleration time at a base frequency of 50Hz
NOTES The RT signal is assigned to the RT terminal in the default setting. By setting "3" to any of
Pr. 178 to Pr. 189 "Input terminal function selection", you can assign the RT signal to an
other terminal.
The RT 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. Please make setting after confirming the function of each terminal.
If the Pr. 20 setting is changed, the Pr. 125 and Pr. 126 ("Frequency setting signal gain fre-
quency") settings do not change.
When the Pr. 7, Pr. 8, Pr. 44, Pr. 45, Pr. 110 or Pr. 111 settings are 0.03s or less, the accel-
eration/deceleration time is 0.04s (under V/f control or advanced magnetic flux vector
control).
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.
6 - 198
T
5
2
×
------------------- -
f + -- - T
2
9
( )
Pr. 3
time [s]
5
15
Frequency Setting [Hz]
50 120
5 16
15 47
Parameter
200 400
38 145
115 435