Mitsubishi Electric FR-A800, Instruction Manual

Page: 495 / 1042

Parameters (H) Protective function parameter
FR-A800 5 - 315
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)
●
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.
157
M430
OL signal output timer 0s
0 to 25 s
Set the OL signal output start time when stall
prevention is activated.
9999 No OL signal output.
858
T040
Terminal 4 function
assignment
0 0, 1, 4, 9999
When set "4", the stall prevention level can be changed
with the signal to the terminal 4.
868
T010
Terminal 1 function
assignment
0 0 to 6, 9999
When set "4", the stall prevention level can be changed
with the signal to the terminal 1.
I001120E
Fig. 5-139: Stall prevention operation example
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%.
Pr. Name
Initial
value
Setting
range
Description
FM CA
Pr. 22
Output current
Acce
ler
ati
on
D
ece
le
rat
ion
Constant speed
Output frequency
OL
Time