
B-63530EN/03 4.DESCRIPTION OF PARAMETERS
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1821 Reference counter size for each axis
NOTE
When this parameter is set, the power must be
turned off before operation is continued.
[Data type] 2-word axis
[Unit of data] Detection unit
[Valid data range] 0 to 99999999
Set the size of the reference counter.
When using an encoder with absolute address reference marks (linear
scale/rotary encoder), set the interval of mark 1 of the encoder with
absolute address reference marks (linear scale/rotary encoder).
NOTE
When a scale with distance-coded reference marks
(detection circuit C) is used, this parameter is used
for an ordinary purpose (reference counter size for
each axis).
1825 Servo loop gain for each axis
[Data type] Word axis
[Unit of data] 0.01 s
-1
[Valid data range] 1 to 9999
Set the loop gain for position control for each axis.
When the machine performs linear and circular interpolation (cutting),
the same value must be set for all axes. When the machine requires
positioning only, the values set for the axes may differ from one
another. As the loop gain increases, the response by position control is
improved. A too large loop gain, however, makes the servo system
unstable.
The relationship between the positioning deviation (the number of
pulses counted by the error counter) and the feedrate is expressed as
follows:
Feedrate
Positioning deviation =
60 × (loop gain)
Unit :
Positioning deviation : mm, inches, or deg
Feedrate : mm/min, inches/min, or deg/min
loop gain : s
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