Mitsubishi Electric FR-A700 Instruction Manual page 267

Parameter
Alarm stop when torque limit is activated (Pr. 874 )
● This function can make an alarm stop if the torque limit is activated to stall the motor.
● The motor stalls if the torque limit is activated under a high load applied during speed control
or position control. At this time, if the motor speed is lower than the speed set in Pr. 865
"Low speed detection" and also the output torque exceeds the level set in Pr. 874 "OLT level
setting" for 3s, it is regarded as a stop effected by stall prevention and E. OLT is output,
resulting in an alarm stop.
Fig. 6-14: Alarm stop when torque limit is activated
NOTES If the frequency has fallen to 0.5Hz by stall prevention operation and remains for 3s under V/f
control and advanced magnetic flux vector control, an alarm (E.OLT) appears to shutoff the
inverter output. In this case, this function is activated regardless of Pr. 874.
This alarm is not provided under torque control.
FR-A700 EC
Speed control by real sensorless vector control, vector control
Torque
Pr. 874
Output torque
Output
frequency [Hz]
Pr. 865
Start ignal
STF
Alarm contact
Torque limit
Time
Time
3 s
E.OLT occurrence
I001508E
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