F416(Stall Reduction At Field Weakening Area); Parameter Setting; Parameter Adjustment; Example Of Adjustment - Toshiba VFAS1 Instruction Manual

2.4 F416(stall reduction at field weakening area)

2.4.1 Parameter setting

parameter
F416

2.4.2 Parameter adjustment

In case of the driving at field weakening area, motor flux is reduced therefore motor maximum torque is also
reduced. In such condition, when instant torque is obtained motor is stalled even if motor current is less than
current limitation.
There are 2 conditions for field weakening area. One is over the base frequency; the other is DC bus voltage
reduction. Especially single phase inverter, DC bus voltage is reduced in case of heavy load.
In such case, reduction of F416 every 5 is effective.
Motor is stalled in case of the driving
with input voltage reduction, or at field
weakening area

2.4.3 Example of adjustment

system： INV：AS1-2007
input voltage：165V
Pt=3 F416=100
Motor current
[20%/div]
Motor torque
[50%/div]
function
Stall reduction at field weakening area
problem
Motor：0.4kW-200V-60Hz
Motor is
stalled over
50Hz
Motor speed [5Hz/div]
range
10～250
countermeasure
To reduce F416 every 5
Pt=3 F416=50
Maximum torque at low
speed is reduced
6
Ｅ６５８１９４７
Default setting
100
Side effect
Maximum torque at low speed
is reduced
No stall