F415（Flux Enhancement At Low Speed; Parameter Setting; Parameter Adjustment - Toshiba VFAS1 Instruction Manual

2.3 F415（flux enhancement at low speed）

2.3.1 Parameter setting

parameter
F415

2.3.2 Parameter adjustment

It is necessary to set PT=2 or 3,4,7,8 to set motor parameters from motor nameplate, and to do auto-tuning
when high output torque at low speed is needed.
If more output torque is needed after doing this procedure, to increase F415 is effective.
In case F415 is large, the magnetizing current at low speed is increased, therefore flux is increased and motor
torque is possible to increase in the limited current.
However, even if F415 is large, motor flux is not linearly increased because of flux saturation depends on the
motor characteristic.
function
Flux enhancement rate at low speed
range
100%～130%
5
Ｅ６５８１９４７
Default setting
100%