Optimal Braking - WEG CFW-11 Programming Manual

Vector Control
NOTE!
For torque control in the sensorless vector mode (P0202 = 3), observe:
- The torque limits (P0169/P0170) must be higher than 30 % to assure the motor starting. After the start
and with the motor rotating above 3 Hz, they can be reduced, if necessary, to values below 30 %.
- For torque control applications with frequencies until to 0 Hz, use the vector with encoder control
mode (P0202 = 4).
- In the vector with encoder control type set the speed regulator for the mode "saturated" (P0160 = 1),
besides keeping the regulator in the saturated state.
NOTE!
The motor rated current must be equivalent to the CFW-11 rated current, in order that the torque
control has the best possible accuracy.
Settings for the torque control:
Torque limitation:
1. Via parameters P0169, P0170 (through the keypad (HMI), Serial or Fieldbus). Refer to the
Torque Current Limitation [95] on page
2. Through the analog inputs AI1, AI2, AI3 or AI4. Refer to the
option 2 (maximum torque current).
Speed reference:
3. Set the speed reference 10 %, or more, higher than the working speed. This assures that the speed
regulator output remains saturated at the maximum value allowed by the torque limit adjustment.
NOTE!
The torque limitation with the saturated speed regulator has also a protection (limitation) function.
E.g.: for a winder, when the material being wound brakes, the regulator leaves the saturated
condition and starts controlling the motor speed, which will be kept at the speed reference value.

11.6 OPTIMAL BRAKING

NOTE!
Only activated on the Vector with Encoder mode (P0202 = 3 or 4), when P0184 = 0, P0185 is
smaller than the standard value and P0404 < 21 (75 CV).
NOTE!
The occurrence of optimal braking may cause at the motor:
- Increase of the vibration level.
- Increase of the acoustic noise.
- Increase of the temperature.
Verify the impact of those effects in the application before using the optimal braking.
It is a function that helps the motor controlled braking, eliminating in many cases the need of additional braking
11
IGBT and braking resistor.
11-8
11-28.
Item 13.1.1 Analog Inputs [38] on page
Item 11.8.6
13-1,