Mitsubishi Electric 800 Series Instruction Manual page 163

Speed control under Real sensorless vector control, vector control, PM sensorless vector
control
Pr.803=2
Torque
Constant torque
Low-speed
range range
Pr.801
Constant torque
limit
Pr.85
Pr.803=10
Torque
Constant torque
Low-speed
range
range
Constant torque limit
Pr.85
NOTE
• When the torque limit setting value (Pr.22, Pr.812 to Pr.817, etc.) is less than the value set in Pr.801, the Pr.801 setting is
used for limiting the torque current.
Trip during torque limit operation (Pr.874)
• A trip can be set for when the torque limit is activated and the motor stalls.
• When a high load is applied and the torque limit is activated under speed control or position control, the motor stalls. At this
time, if a state where the rotation speed is lower than the value set in Pr.865 Low speed detection and the output torque
exceeds the level set in Pr.874 OLT level setting continues for 3 s, Stall prevention stop (E.OLT) is activated and the
inverter output is shut off.
NOTE
• Under V/F control or Advanced magnetic flux vector control, if the output frequency drops to 0.5 Hz due to the stall prevention
operation and this state continues for 3 s, a fault indication (E.OLT) appears, and the inverter output is shut off. This operation
is activated regardless of the Pr.874 setting.
• This fault does not occur under torque control.
162
PARAMETERS
Constant power range
Torque reduction when the
output is limited
Constant torque
limit
Rated speed
Speed
Constant power range
Constant power limit
Rated speed
Speed
Torque
Output torque
Output
frequency
Pr.865
Start signal
(STF)
Fault signal
(ALM)
When the output limit
is not exceeded
Pr.803=11
Torque
Low-speed
range
Torque rise limit
Pr.85
Torque limit
Pr.874
3s
E.OLT occurrence
Constant torque
range Constant power range
Constant torque limit
Rated speed
Time
Time
Speed