Bosch PIN8 N1 Guía para resolver problemas descargar pdf (Pagina 484)

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101

8-52 Drive Functions MPH-02, MPB-02, MPD-02

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

The correction values are determined once during initial commissioning. If

encoder correction has been activated with the drive in operation

(respective bits of P-0-0341), the signal shape errors of the encoder track

are compensated by adding a correction value. The correction values are

generated from the table values of parameter P-0-0342. If there hasn’t

been any encoder selected, the encoder correction is deactivated!

According to experience the encoder correction can be effectively used

for encoders with the following characteristics:

• rotary encoders → up to approx. 1000 cycles/revolution

• linear encoders → division periods up to approx. 0.1mm

Observe the following basic principles for application:

• If the encoder correction shouldn’t cause any improvement, this

function has to be deactivated (relieving the processor!).

• If the constant speed of a drive is to be improved, the encoder

correction has to be applied to the motor encoder.

• If the positioning precision is to be improved, the encoder correction

has to be applied to the position control encoder.

Notes on Commissioning

Before starting the command C3500 make the following preparations for

the respective drive:

• Determine the encoder to be corrected in P-0-0341, Control word for

encoder correction.

• Determine the velocity that mustn’t be exceeded for acquiring the

encoder signals.

• Estimate the travel range of the axis for a motion time of at least 4 s

with the maximum acquisition velocity and make sure that the travel

range is sufficient (start position, direction of motion).

• Activate the "velocity control" mode.

During initial commissioning the encoder correction has to be carried out

once:

• activate drive ("AF") and start P-0-0340, C3500 Command Determine

encoder correction values

• input velocity command values of approx. 75% of calculated maximum

value

CAUTION

Property damage caused by errors when

controlling motors and moving parts!

⇒ Make sure that the travel range of the axis is

sufficient! Activate axis end position switches and set

them to collision-safe positions!

• Observe the status of command execution and with the end of the

command execution set the velocity command value to zero.

• Check the effectiveness of the encoder correction, e.g. by checking

the amplitude of the speed deviation, if, as in the case of the

acquisition of the encoder signals with activated and deactivated

encoder correction, the same distance is traveled in the same way.

With active encoder correction the amplitude has to be distinctly

smaller!

If necessary, repeat the command C3500 with modified acquisition

velocity!

Activation/Deactivation

Notes on Application

Preparation

Carrying Out Encoder Correction

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