Mitsubishi Electric 700 Series Instruction Manual page 109

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 stall prevention operation and fast-response current limit operation will be
performed or not and the operation to be performed at OL signal output.
Fast-Response
Pr. 156
Current Limit∗4
: 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
∗2
Since stall prevention is 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.
∗4
OL signal is not output at fast-response current limit operation.
NOTE
When the load is heavy or 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 load drop due to gravity.
Do not set a small value as the stall prevention operation current.
Otherwise, torque generated will reduce.
Test operation must be performed.
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. 3 Base frequency
104
Stall Prevention
OL
Operation Selection
: Activated Output
: Not activated
:Operation
continued
: Operation
not continued
∗1
— ∗2
— ∗2
— ∗2
CAUTION
Refer to page 107
Signal
Fast-Response
Pr. 156
Current Limit∗4
: Activated
Setting
: Not activated
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
101
∗3
fault (stopped by stall prevention) is displayed and operation stopped.
Stall Prevention
OL
Operation Selection
: Activated Output
: Not activated
:Operation
continued
: Operation
not continued
∗1
— ∗2
— ∗2
— ∗2
Signal