Mitsubishi Electric FR-A700 EC, Instruction Manual, Page: 335 / 826

Parameter Adjust the output torque of the motor (current)
FR-A700 EC 6 - 155
6.7.4 Stall prevention operation
(Pr. 22, Pr. 23, Pr. 48, Pr. 49, Pr. 66, Pr. 114, Pr. 115, Pr. 148, Pr. 149, Pr. 154,
Pr. 156, Pr. 157, Pr. 858, Pr. 868)
This function monitors the output current and automatically changes the output frequency to
prevent the inverter from coming to an alarm stop due to overcurrent, overvoltage, etc. It can
also limit stall prevention and fastresponse current limit operation during acceleration/deceler-
ation, driving or regeneration. Invalid under real sensorless vector control or vector control.
●
Stall prevention
If the output current exceeds the stall prevention operation level, the output frequency of the
inverter isautomatically varied to reduce the output current.Also the second stall prevention
function can restrict the output frequency range in which the stall prevention function is valid.
(Pr. 49).
●
Fast-response current limit
If the current exceeds the limit value, the output of the inverter is shut off to prevent an
overcurrent.
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux