Fagor CNC 8060 - Variables Related to Managing the Feedrate in HSC Mode

·794·
Installation manual
CNC 8060
CNC 8065
10.
CNC VARIABLES.
(REF: 1402)
Variables related to managing the feedrate in HSC mode.
10.45 Variables related to managing the feedrate in HSC mode.
VARIABLES RELATED TO BLOCK PREPARATION.
(V.)[ch].G.PERFRATE
Variable that can only be read from the program, PLC and interface.
The variable returns the execution value; reading it interrupts block preparation.
Percentage of blocks managed by the CNC in block preparation, with respect to the best
possible to reach the maximum feedrate in each section.
Syntax.
·ch· Channel number.
Remarks.
This variable can return a value close to 100; if the percentage of blocks is lower than 100%,
the HSC might be losing room to increase the feedrate, respecting the available room to
brake. To know if this is the case, it will be necessary to analyze the V.G.DROPRATE variable
because the reason the feedrate is not increasing might be geometrical and not due to the
number of blocks available.
(V.)[ch].G.DROPRATE
Variable that can only be read from the program, PLC and interface.
The variable returns the execution value; reading it interrupts block preparation.
Percentage of reduction of the maximum feedrate possible.
Feedrate reduction may be due to an improper supply of blocks or because a feedrate lower
than possible has been programmed.
Syntax.
·ch· Channel number.
Remarks.
This variable can return a value close to 100; if the value is lower than 100%, the CNC may
increase the feedrate if it has more blocks. To know whether the CNC can supply more blocks
or not, it will be necessary to analyze the V.G.PERFRATE variable.
If both variables have a value lower than 100, parameter PREPFREQ may be increased to
increase the supply of blocks as long as the system has enough time; in other words, the
percentage of cycle time used by the CNC is not too close to the total cycle time (about 50%).
This information may be checked in the V.G.NCTIMERATE variable.
ANALYSIS OF THE PROGRAMMED ERROR.
(V.)[ch].G.LIMERROR
Variable that can only be read from the program, PLC and interface.
The variable returns the execution value; reading it interrupts block preparation.
Value of the error that cancels the splines (CONTERROR mode).
This variable may be used to evaluate whether the program is generated with more error than
we demand from the HSC mode or not.
V.[2].G.PERFRATE Channel ·2·.
V.[2].G.DROPRATE Channel ·2·.