Control settings

 

 

Control

l         Via the P-factor, it is possible to define a quick reaction to speed deviations, i.e. it is responsible for the immediate reaction of the regulator. High values will result in a rough operation (vibrations).

l         The I-component is responsible for the accuracy of the regulator. With the I-component, the regulator generates a continuously increasing torque as long as the actual value deviates from the set value (control difference). The increase rate of the torque depends on the I-portion. The smaller the I-portion (integration time) is, the faster the torque is built up. Values which are too low may result in instability of the control system (vibrations).

 

The factory settings are relatively "soft" so that the controller will work in the stable range in any case. Generally, the basic factory settings are sufficient to ensure a satisfactory travel and control bevaviour. The controller settings must be optimized in special cases only.

 

Regulator structure of the VVVF-controller:

In order to enable optimum control of the whole travel range, several regulators are used:

 

Stopping regulator (Halte_P, Halte_I):     Only used for stopping the drive when the brake is opened

Speed regulator (n_P, n_I):                       Activated during the travel operation. The amplification can be changed as from a definable speed threshold (GA).  The amplification values for acceleration and deceleration can be set separately (K START, K STOP).

Position regulator (LR):                              During the deceleration operation, a position regulator is active.

 

 

n_P

Proportional coefficient of the stillstand controller

n_I

Integration time of the speed controller

Halte_P

Proportional coefficient of the stillstand controller

Halte_I

Integration time of the stillstand controller

GA

Switch-over threshold for speed regulator amplification

K_Start

Increase of starting regulator's gain in refer to the speed regulator

K_Stop

Increase of stopping regulator's gain in refer to the speed regulator

MV

Torque pre-control during acceleration and deceleration. Overshooting and undershooting after the ramps can be eliminated with this parameter.

 

 

 

Info

In most cases, the default regulator settings ensure a good traveling behaviour of the system. For this reason, these parameters should only be changed in exceptional cases.

 

For more details, please refer to the VVVF controller manual.

 

 

Version 001 / Date: 07.03.2005