Fagor CNC 8060 - Page 134

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Installation manual
CNC 8060
CNC 8065
2.
MACHINE PARAMETERS.
(REF: 1402)
Machine parameters for the axes. Work sets.
If this alarm is canceled, the CNC shows on power-up a message indicating that this safety
is disabled. This situation can only be allowed during setup; once setup is completed, this
alarm must be enabled.
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: From 0.0001 to 99999.9999 mm or degrees / from 0.00000 to 3937.00787 inch.
Default value: 0.0100 mm or degrees / 0.00039 inch.
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.
BACKLASH COMPENSATION IN MOVEMENT REVERSAL.
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: Within ±3.2768 mm or degrees / within ±0.12901 inch.
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.