Fagor CNC 8060, Installation Manual

Page: 196 / 698

Installation manual.
CNC 8060
CNC 8065
2.
MACHINE PA
RAMETERS.
Mac
h
ine parameters for
the
axes. Work sets.
·196·
(R
EF
: 1709)
2.6.2 Loop setting.
LOOPCH
Velocity command sign change.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
Possible values: Yes / No.
Default value: No.
Associated variable: (V.)[ch].MPA.LOOPCH[set].xn
See machine parameter AXISCH.
AXISCH
Feedback sign change.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
Possible values: Yes / No.
Default value: No.
Associated variable: (V.)[ch].MPA.AXISCH[set].xn
If the axis runs away, the CNC issues a following error message. Change the value of
parameter LOOPCH. If it does not run away, but the counting direction is not the desired one,
change the values of both parameters AXISCH and LOOPCH.
INPOSW
In-position zone.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
Possible values (1): From 0.0001 to 99999.9999 mm.
Possible values (2): From 0.0000 to 3937.00787 inch.
Possible values (3): From 0.0001 to 99999.9999 degrees.
Default value: 0.0100 mm / 0.00039 inch / 0.0100 degrees.
Associated variable: (V.)[ch].MPA.INPOSW[set].xn
The in-position zone is defined as the zone before and after the programmed position where
the axis is considered to be in position. Parameter INPOSW defines the width of both zones.
2.6.3 Backlash compensation.
BACKLASH
Amount of backlash to be compensated.
Parameter valid for linear and rotary axes and spindles.
Parameter valid for analog drive, Sercos and simulated.
Possible values (1): Within ±3.2768 mm.
Possible values (2): Within ±0.12901 inch.
Possible values (3): Within ±3.2768 degrees.
Default value: 0.
Associated variable: (V.)[ch].MPA.BACKLASH[set].xn
With linear encoders (scales), set BACKLASH = 0.
When an axis has backlash and reverses its moving direction, there is a delay from the instant
the motor starts turning to the moment when the axis actually moves. This usually happens
on axes with encoder and on old machines whose leadscrew assembly is defective (worn
out).
Use a dial indicator to measure this backlash. Move the axis in a direction and set the dial
indicator to "0". Move the axis in the opposite direction in incremental mode until detecting
that the axis is moving. The amount of backlash is the difference between the commanded
distance and what it actually moved.