Mitsubishi Electric FR-A820-00046 Instruction Manual page 495

Parameters
Pr.
157
M430
858
T040
868
T010
The upper limit of stall prevention operation is limited internally to the following:
120% (SLD rating), 150% (LD rating), 220% (ND rating), or 280% (HD rating)
Setting the stall prevention operation level (Pr. 22)
Fig. 5-139:
● For Pr. 22 "Stall prevention operation level", set the ratio of the output current to the inverter's
rated current at which the stall prevention operation will be activated. Normally, this should be
set at 150% (initial value).
● Stall prevention operation stops acceleration (makes deceleration) during acceleration, makes
deceleration during constant speed, and stops deceleration during deceleration.
● When the stall prevention operation is performed, the Overload warning (OL) signal is output.
NOTES A continuous overloaded condition may activate a protective function such as motor overload trip
(electronic thermal O/L relay function) (E.THM).
When Pr. 156 has been set to activate the fast response current limit (initial value), the Pr. 22 set-
ting should not be higher than 170%. Such setting will prevent torque generation
When Real sensorless vector control or vector control is selected using Pr. 800 "Control method
selection", Pr. 22 serves as torque limit level.
For the FR-A820-00250(3.7K) or lower and FR-A840-00126(3.7K) or lower, the initial value of Pr. 22
is 200% instead of 150%.
FR-A800
Name
FM
OL signal output timer
Terminal 4 function
assignment
Terminal 1 function
assignment
Pr. 22
OL
Stall prevention operation example
Initial
Setting
value
Description
range
CA
Set the OL signal output start time when stall
0 to 25 s
prevention is activated.
0s
9999 No OL signal output.
When set "4", the stall prevention level can be changed
0 0, 1, 4, 9999
with the signal to the terminal 4.
When set "4", the stall prevention level can be changed
0 0 to 6, 9999
with the signal to the terminal 1.
Output current
Constant speed
(H) Protective function parameter
Output frequency
Time
I001120E
5 - 315