Parameter group 82. Brake operation 1 / 2
P820 / P821 allows you to enable and disable 4-quadrant operation. 4-quadrant operation is possible if you connect a braking resistor to MOVITRAC® B. P820 / P821 must be set to "off" if there is no braking resistor connected to MOVITRAC® B, which means regenerative operation is not possible. In this operating mode, the MOVITRAC® B unit attempts to extend the deceleration ramp. As a result, the generated power is not too great and the DC link voltage remains below the switch-off threshold.
If the regenerative power becomes too great despite the extended deceleration ramps, then MOVITRAC® B may switch off with fault F07 DC link overvoltage. In this case you have to extend the deceleration ramps manually (P131).
Therefore, do not set unreasonably short deceleration ramps
The unit responds with fault F34 Ramp/timeout if the ramp is set too short and the ramp which can actually be achieved is significantly longer than the set value.
