Rockwell-automation 1771-QB Linear Pos. Manual de usuario descargar pdf (Pagina 127)

Initializing and Tuning the Axes

Chapter 8

89

8. Record the new axis position value from the module. This value is in the

status block words 12 and 13 at N44:12 and N44:13 for axis 1.

9. Subtract the initial axis position from the new axis position and record this

as the module distance.

10. Divide the module distance by the actual distance and record this as

transducer calibration correction factor.

11. Multiply the transducer calibration constant in the parameter block words

5 and 6 (N45:5 and N45:6) by the transducer calibration correction factor

calculated in steps 9 and 10. Enter the result as the new transducer

calibration constant and reset the axis by toggling bit 9 of the axis control

word N45:131.

12. Repeat steps 3 through 11 to verify that the transducer calibration constant

is correct.

13. Determine a valid set of parameters for the zero-position offset and the

software travel limits and enter these into the parameter block.

Example: Verifying Transducer Calibration Constants

If the values for axis 1 are:

initial position = 12.324

actual distance = 6.423

new position = 18.737

transducer calibration constant = 9.0500

Then the module distance is:

18.737 – 12.324 = 6.413

The transducer calibration correction factor is:

6.413 / 6.423 = 0.99844

and the new transducer calibration constant is:

0.99844 x 9.0500 = 9.0359

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Rockwell-automation 1771-QB Linear Pos. Manual de usuario Pagina 127