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M800VW/M80VW Series Connection and Setup Manual
26 Setting the Position Detection System
26.1 Adjusting the Absolute Position Detection System
26.1.6 Setting the Grid Interval and the Reference Encoder for Grid Interval
Set the parameters "#2041 grspcref" (reference encoder for grid interval) and "#2029 grspc" (grid interval) according to the
machine configuration.
[For semi-closed loop control]
Set the reference encoder for grid interval to "0" (grid interval from motor side).
Set the grid interval same value as the ball screw pitch.
If the reference encoder for grid interval is set to "1" (grid interval by machine side), the grid interval must be set to the
calculated amount of grid movement per 1 motor rotation ("#2201 SV001 PC1"/"#2202 SV002 PC2" x "#2218 SV018 PIT").
[For full-closed loop control]
Set the reference encoder for grid interval to "1" (grid interval by machine side).
Set the grid interval same value as the Z phase pitch.
If the reference encoder for grid interval is set to "0" (grid interval by motor side), the grid interval must be to set to the
calculated amount of grid movement per Z phase pitch ("2202 SV002 PC2"/"#2201 SV001 PC1" x the Z phase pitch on the
machine side encoder).
[Parameter settings for "Grid interval" and "Reference encoder for grid interval"]
Loop control
Reference encoder for grid interval
0: grid interval by the motor side
Semi-closed
1: grid interval by the machine side
0: grid interval by the motor side
Full-closed
1: grid interval by the machine side
(*) If the grid interval is set to "0", ball screw pitch "#2218 SV018 PIT" will be used instead of grid interval.
26.1.7 Precautions Common for the Initilization Operation
(1) The "#0 Absolute posn set" parameter (axis for which zero point is to be initialized) can be set simultaneously for all axes
or individually for each axis.
(2) The "#0 Absolute posn set" parameter cannot be turned OFF with the keys. It is turned OFF when the power is turned ON
again.
(3) "#2 ZERO-P" can be set at any time as long as "#0 Absolute posn set" is set to "1".
(4) The grid point must be passed at least once after turning the power ON before initializing the zero point. If the grid point
has not been passed, the operation message "Not passed on grid" will appear at the "Machine posn".
(5) When the absolute position is established, the required data will be stored in the memory.
#2041 grspcref
489
#2029 grspc
Grid interval
Same value as the ball screw pitch
Calculated value of "#2201 SV001 PC1"/
"#2202 SV002 PC2" x "#2218 SV018 PIT"
Calculated value of "2202 SV002 PC2"/
"#2201 SV001 PC1" x Z phase pitch on ma-
chine side encoder
Same value as the Z phase pitch
Calculation for the grid
interval
unnecessary
necessary
necessary
unnecessary
IB-1501612-C
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