Optimal Flux For Sensorless Vector Control - WEG CFW-11 Programming Manual

Vector Control
NOTE!
Every time that P0408 = 1 or 2 the parameter P0413 (Mechanic time constant – T
for a value close to the motor rotor mechanic time constant. Therefore, the motor rotor inertia (table
data valid for WEG motors), the inverter rated voltage and current, are taken into consideration.
P0408 = 2 (Run for I
routine, couple the load to the motor and set P0408 = 4 (Estimate T
estimated taking into account also the driven load.
If the option P0408 = 2 (Run for I
value of P0410 (I
constant - Tr) and for P0413 (mechanic time constant – T
occur during the inverter operation.
Note: The term "load" includes everything that might be coupled to the motor shaft, for instance,
gearbox, inertia disk, etc.
In the option P0408 = 4 (Estimate T
time constant – T
to the motor.
During its execution, the self-tuning routine can be canceled by pressing the
the values of P0409 through P0413 be all different from zero.
For more details on the self-tuning parameters, refer to the
in this manual.
Alternatives for the acquisition of the motor parameters:
Instead of running the self-tuning, it is possible to obtain the values for P0409 to P0412 in the following
manner:
- From the motor test data sheet that can be supplied by its manufacturer. Refer to the
of the Parameters P0409 to P0412 Based on the Motor Data Sheet on page
- Manually, by copying the contents of the parameters from another CFW-11 inverter that uses an identical
motor.

11.4 OPTIMAL FLUX FOR SENSORLESS VECTOR CONTROL

NOTE!
Active function only on the Sensorless Vector mode (P0202 = 3), if P0406 = 2.
The Optimal Flux function can be used for driving some types of WEG motors (*) making it possible the operation
at low speed with rated torque without the need of forced ventilation on the motor. The frequency range for
operation is 12:1, i.e., from 5 Hz to 60 Hz for 60 Hz rated frequency motors and from 4.2 Hz to 50 Hz for
50 Hz rated frequency motors.
11
11-6
) in the vector with encoder mode (P0202 = 4): After finishing the self-tuning
m
) is executed with the load coupled to the motor, an incorrect
m
) may be estimated. This will implicate in estimation error for P0412 (rotor time
m
) the self-tuning routine estimates only the P0413 (Mechanic
m
) value, with the motor rotating. It must be done, preferably, with the load coupled
m
). In this case P0413 will be
m
). Overcurrent fault (F071) may also
m
Item 11.8.5 Self-Tuning [05] and [94] on page
Item 11.7.1 Adjustment
11-15.
) will be adjusted
m
key, provided that
11-23,