P-0-0445

P-0-0445 1:

Functional description from firmware v2.12:

The description of the parameter for field weakening applies to newly configured machines and systems with firmware version v2.12 or higher and the Basic Field Weakening setting.

When updating from older firmware versions to newer firmware versions, the original field weakening configuration is retained.

The original configuration of the field weakening can still be used with the compatibility mode in parameter P-0-0455.

P-0-0445 2:

Current ratio

Synchronous motors

Via this setting in the parameter you configure which current can be impressed for the reduction of the induced voltage.

The total current is limited according to the formula P-0-0445 3:.

The field weakening current [Id] reduces the available torque-forming current [Iq] via the calculation.

P-0-0445 4:

Example

If the default value is 60%, 80% of the torque is available for the speed controller.

Usable current flow [q] =.P-0-0445 5:

For the percentage specification of the "Current ratio", the smaller value from the nominal motor current S-0-0196 or the channel nominal current P-0-0093 is selected as the reference value.

The resulting maximum field weakening current is displayed in parameter P-0-0446. This value refers to the maximum channel current in P-0-0092.

Asynchronous motors

A flow-forming current [d] is defined for operation. The current ratio indicates to what extent this current may be reduced in order to maintain the voltage limit.

The value in % by which the flux-forming current [d] may be reduced is now entered in the input mask of the current ratio.

Voltage utilization

P-0-0445 6:

Scope:

The following settings apply to synchronous motors and asynchronous motors.

Voltage utilization indicates the maximum available voltage in relation to the current DC link voltage. In the input mask you can determine what percentage of the currently available total voltage is utilized at the voltage limit.

The higher the voltage utilization percentage, the higher the torque that can be set at a given speed. The difference to 100% is the control value reserve for the current control loop.

rsvd

Reserved input window. No purpose here.

Integral Action time

The "Integral Action time" is the integral action time of the voltage regulator within the field weakening. The field weakening voltage regulator is superimposed on the current controller. A dynamic range should be maintained when setting the integral action time.