Mitsubishi FR-A740-00023-EC - Page 158

148
Adjust the output torque of the motor (current)
(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.
*1 When "Operation not continued for OL signal output" is selected, the " " alarm code (stopped by stall prevention) is displayed and
operation 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.
Pr. 156
Setting
Fast response
Current Limit
: Activated
: Not activated
Stall Prevention
Operation Selection
:Activated
:Not activated
OL Signal
Output
:Operation
continued
: Operation
not continued
*1
Pr. 156
Setting
Fast response
Current Limit
:Activated
: Not activated
Stall Prevention
Operation Selection
 :Activated
 :Not activated
OL Signal
Output
:Operation
continued
: Operation
not continued
*1
Acceleration
Constant
speed
Deceleration Acceleration
Constant
speed
Deceleration
0
(initial
value)
 16 
1  17 
2  18 
3  19 
4  20 
5  21 
6  22 
7  23 
8  24 
9  25 
10  26 
11  27 
12  28 
13  29 
14  30 
15 ⎯
*2 31 ⎯ *2
100
*3
Driving

101
*3
Driving

Regeneration
⎯ *2
Regeneration
⎯ *2
CAUTION
⋅ When the load is heavy, when the lift is predetermined, 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.
CAUTION
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 Refer to page 94
⋅ Pr. 73 Analog input selection Refer to page 275
⋅ Pr. 178 to Pr. 189 (Input terminal function selection) Refer to page 222
⋅ Pr. 190 to Pr. 196 (output terminal function selection) Refer to page 230
⋅ Pr. 570 Multiple rating setting Refer to page 149
⋅ Pr. 858 Terminal 4 function assignment, Pr. 868 Terminal 1 function assignment Refer to page 274