WEG CFW700, Programming And Troubleshooting Manual

Page: 99 / 223

Vector Control
11
CFW700 | 11-21
P0408=3 – Run for T
m
: The value of P0413 (Mechanic time constant – T
m
) is estimated, with the motor rotating.
It must be done, preferably, with the load coupled to the motor. P0409 to P0412 are estimated with the motor
standing still and P0410 is estimated in the same manner as with P0408=1.
P0408=4 – Estimate T
m
: it estimates only the P0413 (Mechanic time constant – T
m
) value, with the motor
rotating. It must be done, preferably, with the load coupled to the motor.
NOTES!
„
Every time that P0408=1 or 2:
The parameter P0413 (Mechanic time constant – T
m
) will be adjusted to a value close to the motor
mechanic time constant. Therefore, the motor rotor inertia (table data valid for WEG motors), the
inverter rated voltage and current are taken into consideration.
„
Vector mode with encoder (P0202=5):
When using P0408=2 (Run for I
m
), one must, after finishing the self-tuning routine, couple the
load to the motor and set P0408=4 (Estimate T
m
) in order to estimate the value of P0413. In this
case P0413 will also consider the driven load.
„
VVW mode – Voltage Vector WEG (P0202=3):
In the VVW control self-tuning routine only the value of the stator resistance (P0409) will be
obtained. Therefore, the self-tuning will always be performed without rotating the motor.
„
Better self-tuning results are obtained with the motor warm.
P0409 – Motor Stator Resistance (Rs)
Adjustable
Range:
0.000 to 9.999 ohm Factory
Setting:
0.000 ohm
Properties: cfg, Vector and VVW
Access groups
via HMI:
MOTOR
Description:
It is the value estimated by the self-tuning.
NOTE!
The P0409 setting determines the value of the current regulator integral gain P0168. The parameter
P0168 is recalculated every time the content of P0409 is modified via keypad (HMI).