Mitsubishi Electric FR-E700 Instruction Manual page 228

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 re-
quired 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 6.7.3.
Guideline for acceleration/deceleration time when Pr. 3 "Base frequency" = 50 Hz (0 Hz to set frequency).
Acceleration/Deceleration time [s]
Tab. 6-6:
NOTES
Changing terminal assignment may affect the other functions. Make setting after confirming the
function of each terminal. (Refer to section 6.10.3.)
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 0.03 s or less, the acceleration/deceleration time
is 0.04 s. At that time, set Pr. 20 to "120 Hz" or less.
If the acceleration/deceleration time is set, the actual motor acceleration/deceleration time can-
not be made shorter than the shortest acceleration/deceleration time determined by the mechan-
ical system J (inertia moment) and motor torque.
6 - 74
2
5
T
------------------- - f + -- - T
9
2
Pr. 3
5
15
Acceleration/deceleration time at a base frequency of 50 Hz
Frequency Setting [Hz]
50 120
5 16
15 47
Parameter
200 400
38 145
115 435