Mitsubishi Electric FR-F820-00077 Instruction Manual page 278

(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
NOTES The reference frequency during acceleration/deceleration depends on the Pr. 29 "Acceleration/
deceleration pattern selection" setting. (Refer to page 5-107.)
The RT signal can be assigned to an input terminal by setting Pr. 178 to Pr. 189 (input terminal
function selection). Changing the terminal assignment may affect other functions. Set parameters
after confirming the function of each terminal.
The RT signal acts as the second function selection signal and makes the other second functions
valid. (Refer to page 5-291.)
RT signal is assigned to the terminal RT in the initial status. Set "3" in any of Pr. 178 to Pr. 189 (input
terminal function selection) to assign the RT signal to another terminal.
Setting the acceleration/deceleration time in the low-speed range (Pr. 791, Pr. 792)
If torque is required in the low-speed range (less than 10% of the rated motor frequency) under PM
motor control, set the Pr. 791 "Acceleration time in low-speed range" and Pr. 792 "Deceleration time
in low-speed range" settings higher than the Pr. 7 "Acceleration time" and Pr. 8 "Deceleration time"
settings so that the mild acceleration/deceleration is performed in the low-speed range. (When RT
signal is turned ON, the second acceleration/deceleration time setting is prioritized.)
Fig. 5-19:
NOTES Set Pr. 791 higher than Pr. 7, and Pr. 792 higher than Pr. 8. If set as Pr. 791 < Pr. 7, the operation is
performed as Pr. 791 = Pr. 7. If set as Pr. 792 < Pr. 8, the operation is performed as Pr. 792 = Pr. 8.
Refer to page 8-4 for the rated motor frequency of MM-EFS/MM-THE4.
Parameters referred to
Pr. 3
Pr. 10
Pr. 29
Pr. 125, Pr. 126
Pr. 178 to Pr. 182
Pr. 264
Pr. 265
5 - 106
Acceleration time
in low-speed range
Slope set by Pr. 791
Acceleration time
Slope set by Pr. 7
Setting the acceleration/deceleration time in the low-speed range
Base frequency
DC injection brake operation frequency
Acceleration/deceleration pattern selection
(frequency setting gain frequency)
(input terminal function selection)
Power-failure deceleration time 1
Power-failure deceleration time 2
Low-speed range
(rated motor frequency/10)
Time
Deceleration time
in low-speed range
Slope set by Pr. 792
Deceleration time
Slope set by Pr. 8
Parameters
I002555E
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