Mitsubishi Electric FR-A720-00030-NA Instruction Manual page 167

Adjustment of the output torque
(current) of the motor
(7) Limit the stall prevention operation and fast response current limit operation according to
the operating status (Pr. 156)
 Refer to the following table and select whether fast response current limit operation will be performed or not and
the operation to be performed at OL signal output.
Fast response
Current Limit
Pr. 156
: Activated
Setting

: Not activated
0
(initial 
value)
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 

100
*3

*1 When "Operation not continued for OL signal output" is selected, the "
stopped.
*2 Since both fast response current limit and stall prevention are not activated, OL signal and E.OLT are not output.
*3 The settings "100" and "101" allow operations to be performed in the driving and regeneration modes, respectively. The setting "101" disables the
fast response current limit in the driving mode.
CAUTION
 When the load is heavy, or when the acceleration/deceleration time is short, stall prevention is activated and acceleration/
deceleration may not be made according to the preset acceleration/deceleration time. Set Pr. 156 and stall prevention operation
level to the optimum values.
 In vertical lift applications, make setting so that the fast response current limit is not activated. Torque may not be produced,
causing a drop due to gravity.
Do not set a small value as the stall prevention operation current.
Otherwise, torque generated will reduce.
Always perform test operation.
Stall prevention operation during acceleration may increase the acceleration time.
Stall prevention operation performed during constant speed may cause sudden speed changes.
Stall prevention operation during deceleration may increase the deceleration time, increasing the deceleration
distance.
Parameters referred to 
 Pr. 22 Torque limit level
 Pr. 73 Analog input selection
 Pr. 178 to Pr. 189 (Input terminal function selection)
 Pr. 190 to Pr. 196 (output terminal function selection)
 Pr. 570 Multiple rating setting
 Pr. 858 Terminal 4 function assignment, Pr. 868 Terminal 1 function assignment
156
Stall Prevention
OL signal
Operation Selection
Output
:Activated
 :Operation
:Not activated
continued

:Operation
not continued
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

  
   

  
CAUTION
Refer to page 99
Refer to page 291
Refer to page 235
Refer to page 243
Refer to page 157
Fast response
Current Limit
Pr. 156
:Activated
Setting

: Not activated
*1
16 
17 
18 
19 
20 
21 
22 
23 
24 
25 
26 
27 
28 
29 
30 
31 
*2

101
*3

*2
" fault (stopped by stall prevention) is displayed and operation
Refer to page 290
Stall Prevention
OL signal
Operation Selection
Output
:Activated
 :Operation
:Not activated
continued

:Operation
not continued
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

  
   

  
*1
*2
*2