When adaptive control is enabled, which is the default status, the current loop employs two different algorithms, one of which applies high gain in the

discontinuous current region. This is unsuitable for some applications, such as non-motor loads, for which adaptive control should be disabled.

5.26

Continuous autotune

Bit

Coding

Default

Update rate

Background read

When set this enables the continuous autotune function that continuously monitors the motor current ripple and adjusts the current loop gains

(Pr 5.15, Pr 4.13 and Pr 4.34) for optimum performance. The commissioning autotune should still be carried out because the continuous integral gain

(Pr 4.14) is not set by the continuous autotune. Calculation of the gains is suspended when the voltage spill over loop becomes active so that the

gains are not increased when the field is weakened. This function does not operate when the drives are set-up in series 12-pulse mode.

5.28

Field weakening compensation disable

Bit

Coding

Default

Update rate

Background read

When the flux in the motor is reduced below its rated level the level of torque producing current required for a given amount of shaft torque is higher

than the rated level. In speed control the compensation prevents gain reduction at higher speeds. In torque control the compensation maintains the

torque at the correct level for a given torque demand. In some applications using speed control it may be desirable to have a reduction of gain as the

motor flux is reduced to maintain stability. If this is required Pr 5.28 should be set to one.

5.29

Motor saturation breakpoint 1

Bit

Coding

Range

0 to 100 % of rated flux

Default

Second motor

Pr 21.25

parameter

Update rate