Fagor CNC 8055i, Руководство по установке

Страница: 357 / 732

Installation manual
CNC 8055
CNC 8055i
CONC
EPTS
7.
S
OFT
: V02.2
X
·357·
Main
an
d
second
spi
ndl
e
When it is due to variations of the programmed feedrate, "ACFGAIN" (P42) = YES, it is called AC-
forward gain" since it is due to acc./dec.
Best results are usually obtained when using it as AC-forward Gain, "ACFGAIN" (P42) = YES
together with feed-forward gain.
This gain is only to be used when operating with acceleration/deceleration control.
A practical value between 2 to 3 times the Proportional Gain, "PROGAIN" (P23), may be used.
To perform a critical adjustment, proceed as follows:
• Verify that there are no oscillations of following error, In other words, that it is not unstable.
• Check,with an oscilloscope, the tacho voltage or the command voltage at the drive (velocity
command), verify that it is stable (left graph) and that there are no instabilities when starting up
(center graph) or when braking (right graph).
Machine reference point setting
To set the machine reference point proceed as follows:
• Indicate in the spindle parameter REFPULSE (P32) the type of marker pulse Io being used for
Home Search.
• Likewise, set spindle parameter REFDIREC (P33) to indicate the direction of the axis when
searching Home.
• On the other hand, set spindle parameter REFEED1 (P34) that defines the approach feedrate
of the spindle until the home switch is pressed and spindle parameter REFEED2 (P35) that
indicates the homing feedrate until the reference mark (marker pulse) is detected.
• The machine reference point will be set to 0, spindle parameter REFVALUE (P36).
• Once in JOG mode and after positioning the spindle in the right area, start homing the spindle.
When done, the CNC will assign a "0" value to this point.
• After moving the spindle to the Machine Reference Zero or up to a known position (with respect
to Machine Reference Zero), observe the position reading of the CNC for that point.
This will be distance from the Machine Reference Zero to that point. Therefore, the value to be
assigned to spindle parameter REFVALUE (P36), which defines the coordinate corresponding
to the Machine Reference Point (physical location of the marker pulse).
REFVALUE (P36) = Machine coordinate – CNC reading.
Example:
If the point whose known position is located at 12º mm from Machine Reference Zero and
the CNC reads -123.5º as the coordinate value for this point, the coordinate of the Machine
Reference Point with respect to Machine Reference Zero will be:
"REFVALUE" P36 = 12 - (-123.5) = 135.5º
• After allocating this new value, press SHIFT + RESET or turn the CNC off and back on in order
for the CNC to assume this new value.
• The spindle must be homed again in order for it to assume its right reference values.