If this parameter is zero then ramp hold only is applied when the drive is not active and until the end of the post-brake release delay to ensure that the

speed reference remains at zero until the brake has released. If this parameter is set to one the position controller (see menu 13) is also enabled

(Pr 13.10 = 1) and the local position reference source is selected (Pr 13.04 = 4(LocAL)) during the period when ramp hold is active. Provided the

default, non-absolute mode, is selected the position controller can help to limit the movement of the motor when the brake is released. When Pr 12.49

is changed from one to zero Pr 13.04 and Pr 13.10 are automatically set to zero.

Field active

12.50

Coding

Bit

Default

Update rate

Background write/read

When Pr 12.51 = 0 this parameter will be 0 when the field current (Pr 5.54) is below 7/8 of the rated field current (Pr 5.67) and 1 when the field current

(Pr 5.54) is above 7/8 of the rated field current Pr 5.67.

When Pr 12.51 = 1 the internal field controller does not control this parameter. An external field controller can then be used to control Pr 12.50.

External field control

12.51

Coding

Bit

Default

Update rate

Background read

When Pr 12.51 = 0, Pr 12.50 is controlled by the internal field controller, when Pr 12.50 can be controlled by an external field controller .

Mentor MP Advanced User Guide

Issue Number: 1