Mitsubishi Electric FR-A720-0.4K Instruction Manual page 162

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.
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 "
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.
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.
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. 858 Terminal 4 function assignment, Pr. 868 Terminal 1 function assignment
152
Stall Prevention
OL Signal
Operation Selection
Output
:Activated
:Operation
:Not activated
continued
:Operation
not continued


Refer to page 98
Refer to page 274
Refer to page 221
Refer to page 228
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
" alarm code (stopped by stall prevention) is displayed and
CAUTION
Refer to page 273
Stall Prevention
OL Signal
Operation Selection
Output
:Activated
:Operation
:Not activated
continued
:Operation
not continued


*1
*2
*2