Speed Limits In Torque Control Mode - Toshiba TOSVERT VF-AS1 Instruction Manual

5. Speed limits in torque control
mode
f425 : Forward speed limit input selection
f426 : Forward speed limit input level
f427 : Reverse speed limit input selection
f428 : Reverse speed limit input level
• Function
The function is to limit the rise in the output frequency of the inverter due to a drop of the load torque
during operation in torque control mode. These functions are useful for protecting a machine.
Torque command
(Motor torque)
Load torque
Forward speed limit level
Speed
Reverse speed limit level
■ Setting with the operation panel
Forward speed limit level
f426
Z
Speed
Reverse speed limit level
f428
Z
f430 : Speed limit (torque=0) center value
f431 : Speed limit (toque=0) center value
f432 : Speed limit (toque=0) band
f433 : Speed limit (toque=0) recovery time
Torque reference set by an external potentiometer
The speed varies according with the load torque.
The speed varies according with the load
torque.
11
reference selection
Torque produced by
motor
Coast stop
Coast stop
E6581331