Bosch PIN8 N1 Guia de Resolução de Problemas descarregar pdf (Página 269)

100

101

MPH-02, MPB-02, MPD-02 Drive Control 6-57

DOK-INDRV*-MP*-02VRS**-FK01-EN-P

To determine the "critical proportional gain" proceed as follows:

1. Let the drive move with low velocity after switching drive enable on:

• linear motor → 1000 … 2000 mm/min

• rotary motor → 10 … 20 rpm

2. Increase value in parameter S-0-0100, Velocity loop proportional

gain until instable behavior (continuous oscillation) occurs.

3. Determine frequency of oscillation by oscilloscoping the actual

velocity (see also "Analog Outputs" or "Oscilloscope Feature"). When

frequency of oscillation is considerably higher than 500 Hz, increase

value in parameter P-0-0004, Velocity loop smoothing time

constant until oscillation diminishes. Then continue increasing the

value in parameter S-0-0100, Velocity loop proportional gain until

oscillation (instability) occurs again.

4. Reduce parameter S-0-0100, Velocity loop proportional gain until

permanent oscillation decreases automatically.

The value thus determined is the so-called "critical velocity loop

proportional gain".

Note: By using the filter cascade (P-0-1120, P-0-1121, P-0-1122,

P-0-1123) it is possible to activate a PT4-filter.

To determine the "critical integral action time" proceed as follows:

1. Set parameter S-0-0100, Velocity loop proportional gain =

0.5 * "critical proportional gain"

2. Reduce value in parameter S-0-0101, Velocity loop integral action

time, beginning with maximum value, until instable behavior

(continuous oscillation) occurs.

3. Increase value in parameter S-0-0101, Velocity loop integral action

time until continuous oscillation decreases automatically.

The value thus determined is the "critical integral action time". Usual

values are within the range from 5 to 20 ms!

From the determined critical values (see above) it is possible to derive a

controller setting with the following characteristics:

• independent of changes at the axis because sufficient distance to

stability limit

• properties can be reliably reproduced in series machines

The following table contains some of the most common types of

application and the corresponding characteristics of the control loop

setting.

Application type

Speed controller

proportional gain

Speed controller

integral action time Notes

feed axis at standard

machine tool

= 0.5 x K

pkrit

= 2 x T

nkrit

good load stiffness and good control

performance

feed axis at perforating

machine or nibbling

machine

= 0.8 x K

pkrit

= 0 high proportional gain; no I-component in

order to obtain short response times

feed drive at following-

on cutting devices

= 0.5 x K

pkrit

= 0 relatively non-dynamic controller setting

without I-component in order to keep the

material to be cut from getting distorted with

the cutting device

Fig. 6-40: Characteristics of controller setting

Determining the Critical

Proportional Gain

Determining the Critical Integral

Action Time

Characteristics of Controller

Setting

1 2 ... 264 265 266 267 268 269 270 271 272 273 274 ... 727 728

Comentários a estes Manuais

Sem comentários

Bosch PIN8 N1 Guia de Resolução de Problemas Página 269

Comentários a estes Manuais

Manuais e produtos relacionados com Fogões Bosch PIN8 N1