Mitsubishi Electric FR-F820-00046 Instruction Manual page 281

Fr-f800 series
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• When a high load is applied and the stall prevention is activated, the motor stalls. At this time, if a state where the motor
rotation speed is lower than 1.5 Hz and the output torque exceeds the level set in Pr.874 OLT level setting continues for
3 seconds, the 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 seconds, a fault indication (E.OLT) appears, and the inverter output is shut off. This
operation is activated regardless of the Pr.874 setting.
CAUTION
• Do not set the stall prevention operation current too low.
Doing so will reduce the generated torque.
• Be sure to perform the test operation.
Stall prevention operation during acceleration may extend the acceleration time.
Stall prevention operation during constant-speed operation may cause sudden speed changes.
Stall prevention operation during deceleration may extend the deceleration time.
Parameters referred to
Pr.73 Analog input
selectionpage 330
Pr.178 to Pr.189 (Input terminal function
Pr.190 to Pr.196 (Output terminal function
Pr.858 Terminal 4 function assignment, Pr.868 Terminal 1 function
280
5. PARAMETERS
5.7 (H) Protective function parameter
Torque
Pr.874
Output torque
Output
frequency
1.5Hz
Start signal
(STF)
Fault signal
(ALM)
selection)page 355
selection)page 312
assignmentpage 334
Stall prevention limit
Time
Time
3s
E.OLT occurs

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