Torque Control - WEG CFW-11 Programming Manual

When this function is activating, the motor flux is controlled in a way to reduce their electric losses on slow
speeds. That flux is dependent of the torque current filtered (P0009). The Optimal Flux function is unnecessary
in motors with independent ventilation.

11.5 toRqUe coNtRoL

In vector control modes sensorless or with encoder, it is possible to use the inverter in torque control mode
instead of using it in speed control mode. In this case the speed regulator must be kept saturated and the
imposed torque value is defined by the torque limits in P0169/P0170.
Performance of the torque control:
Vector control with encoder:
Torque control range: 10 % to 180 %;
Accuracy: ± 5 % of the rated torque.
Sensorless vector control:
Torque control range: 20 % to 180 %;
Accuracy: ± 10 % of the rated torque;
Minimum operating frequency: 3 Hz.
When the speed regulator is positively saturated, i.e., forward speed direction defined in P0223/P0226, the
value for the torque current limitation is adjusted in P0169. When the speed regulator is negatively saturated,
i.e., reverse speed direction, the value for the torque current limitation is adjusted in P0170.
The torque at the motor shaft (T
(*) The formula described next must be used for Forward Torque. For Reverse Torque replace P0169 by
P0170.
Being:
N = motor synchronous speed,
nom
N = actual motor speed
) in % is given by the formula:
motor
P0401 x P0169* x K
T =
motor
- P0410 x P0178
(P0401) 2
1 for N P0190 x N
≤
P0400
K =
N x P0190 for N > P0190 x N
nom
N P0400
100
x 100
2
100
nom
nom
P0400
Vector Control
11
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