Fagor CNC 8055i FL EN - Gear Ratio Management on Axes and Spindle

Installation manual
CNC 8055
CNC 8055i
CONCEPTS
7.
SOFT: V02.2X
·391·
Gear ratio management on axes and spindle
7.19 Gear ratio management on axes and spindle
The gear ratios on axes and spindle, depending on whether they are analog, CAN or Sercos, are
managed as follows:
Sercos
If axis parameters PITCHB (P86), INPREV (P87) and OUTPREV (P88) are other than 0, the CNC
will assume these values and will not issue an error.
If axis machine parameters PITCHB (P86)=0, INPREV (P87)=0 and OUTPREV (P88)=0, it will read
these parameters from the drive. The equivalences are:
• axis parameter PITCHB (P86) = NP123 (drive)
• axis parameter INPREV (P87) = NP121 (drive)
• axis parameter OUTPREV (P88) = NP122 (drive)
If the value of any of these parameters is other than 0, the CNC shows a message indicating that
the parameters are wrong. In this case, in JOG mode or in execution, it displays an error and it will
not be possible to move the machine.
When using SERCOS spindles, the velocity command may be output based on spindle parameters
INPREV1..4 and OUTPREV1..4 (P72..79) as it is done with CAN spindles. To do it this way, some
of spindle parameters INPREV1..4 or OUTPREV1..4 must be set to a value other than 0. In this case,
parameters INPREV and OUTPREV are written in the drives.
Another option is to set spindle machine parameters MAXVOLT1..4 (P37..40). Making the CNC work
taking MAXVOLT1..4 (P37..40) into account requires setting all parameters INPREV1..4 and
OUTPTREV1..4 to 0. In this case, it will read the gear ratio values of the servo system. The CNC
applies the values of NP121 and NP122 of the first 4 gears, SP20 (Volts) and SP21 (rpm) of the
drive and MAXGEAR1..4 and MAXVOLT1..4 of the CNC.
CAN
If axis machine parameters INPREV (P87)=0 and OUTPREV (P88)=0, they will be taken as if they
were 1. There is no need to put anything in axis parameter PITCH (P7), except in the following case:
If axis parameter DRIBUSLE (P63) = 0 and axis parameters INPREV (P87) and OUTPREV
(P88) are 0, it will attend to axis parameter PITCH (P7).
the way to set gear ratios in an axis is the following:
• PITCHB (P86) = leadscrew pitch.
• INPREV (P87) = input revolutions.
• OUTPREV (P88) = output revolutions.
Analog
the way to set gear ratios in an axis is the following:
• If axis parameters PITCHB (P86), INPREV (P87) and OUTPREV (P88) are 0, the gear ratios
are set as follows:
 PITCH (P7) = leadscrew pitch.
 If there are gears, PITCH (P7) = (leadscrew pitch x OUTPREV) / INPREV.
• If axis parameters PITCHB (P86), INPREV (P87) and OUTPREV (P88) are other than 0, the
CNC will assume these values and will not issue an error.
• If the value of any of these parameters is other than 0, the CNC shows a message indicating
that the parameters are wrong. In this case, in JOG mode or in execution, it displays an error
and it will not be possible to move the machine.
In any configuration where the INPREV or OUTPREV values are indivisible, the I0 (home) signal will
be generated from the home switch (DECEL*).
The feature to detect the right I0 among several possible ones by different gear ratios only works for
spindles and Sercos rotary axes.
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