Stall Prevention; Torque Limit - Mitsubishi Electric FR-E700 Instruction Manual

Adjust the output torque (current) of the motor
6.3.5 Stall prevention operation
(Pr. 22, Pr. 23, Pr. 48, Pr. 66, Pr. 156, Pr. 157, Pr. 277)
This function monitors the output current and automatically changes the output frequency to
prevent the inverter from coming to trip due to overcurrent, overvoltage, etc. In addition, simple
torque limit which limits the output torque to the predetermined value can be selected.
It can also limit stall prevention and fast-response current limit operation during acceleration/de-
celeration, driving or regeneration.
● Stall prevention
If the output current exceeds the stall prevention operation level, the output frequency of the
inverter is automatically varied to reduce the output current.
● Fast-response current limit
If the current exceeds the limit value, the output of the inverter is shut off to prevent an
overcurrent.
● Torque limit
The inverter output frequency is controlled so that the output torque (torque current) will not
exceed the stall prevention operation level (motor rated torque is referenced).
Pr.
Name
No.
Stall prevention operation
22
level
Stall prevention operation
23
level compensation factor at
double speed
Second stall prevention oper-
48
ation current
Stall prevention operation
66
reduction starting frequency
Stall prevention operation
156
selection
157
OL signal output timer
Stall prevention operation
277
current switchover
The above parameters can be set when Pr. 160 "User group read selection" = 0.
6 - 42
Initial Setting
Description
Value Range
0 Stall prevention operation invalid
150%
Set the current value to start the
0.1–120%
stall prevention operation.
The stall operation level can be
0–200% reduced when operating at a high
9999
speed above the rated frequency.
9999 Constant according to Pr. 22.
0 Stall prevention operation invalid
Second stall prevention operation
9999
0.1–200%
level
9999 Same level as Pr. 22.
Set the frequency at which the
50Hz 0–400Hz stall operation level is started to
reduce.
Select whether stall prevention
0–31/ operation and fast-response cur-
0
100/101 rent limit operation will be per-
formed or not.
Output start time of the OL signal
0–25s output when stall prevention is
0s
activated.
9999 Without the OL signal output
0 Output current is the limit level
0
Output torque (torque current) is
1
the limit level
Parameter
Parameters referred to
3 Base frequency
178–184 Input terminal
function selection
190–192 Output terminal
function selection
Refer to
Section
6.5.1
6.10.1
6.10.5