Mitsubishi Electric FR-F740 EC Instruction Manual page 202

Motor torque
NOTES When the load is heavy, when the lift is predetermined, or when the acceleration/decelera-
tion time is short, stall prevention is activated and acceleration/deceleration may not be
made according to the preset acceleration/deceleration time. Set Pr. 156 and stall preven-
tion operation level to the optimum values.
In vertical lift applications, make setting so that the fast-response current limit is not acti-
vated. Torque may not be produced, causing a drop due to gravity.
CAUTION:
E
● Do not set a small value as the stall prevention operation current. Otherwise, torque
generated will reduce.
● Always perform test operation.
Stall prevention operation during acceleration may increase the acceleration time.
Stall prevention operation performed during constant speed may cause sudden
speed changes.
Stall prevention operation during deceleration may increase the deceleration time,
increasing the deceleration distance.
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Parameter