B–64113EN–1/01
4. REFERENCE POSITION ESTABLISHMENT
259
41.8
8.242.0
8.0
PRM.1821
PRM.1882
PRM.1884 100,000,000 ) PRM.1883
Scale zero Scale end
Mark1=Mark2
Mark1 Mark2 Mark1 Mark2
Reference point
[Example of parameter setting]
When IS–B and millimeter machine and using a scale figured below:
20.000 19.980 9.940 10.060
9.960
10.040 9.980 10.020
5.000 20.000mm
20.020mm
–[9960/(20020–20000)*20000+5000]=–9965000
BA
Scale zero
Mark1=Mark2
Mark1 Mark2
Reference point Minus direction
Plus direction
Mark1
Mark1 Mark2 Mark1 Mark2 Mark1 Mark2 Mark1
Parameter
No.1821 (Mark1 interval) = ”20000”
No.1882 (Mark2 interval) = ”20020”
No.1883 (Reference position) = Position of point A + 5.000
= (Distance of A to B) / ( Mark2 interval – Mark1 interval)
* Mark1 interval + 5.000
= 9960 / (20020–20000) * 20000 + 5000
= 9965000
”–9965000”(Reference point is located in minus side)
[The setting method of parameter No.1883]
(Linear scale with absolute addressing reference mark (A/B phase))
When the measurement of a parameter No.1883 (Distance between scale
zero and reference position) is difficult, you can determine the setting
value by the following procedure.
(1)Set ”1” to parameter No.1815#2,#1 to make this function available.
Set a correct value to parameter No.1821, No.1882.
Set ”0” to parameter No.1240.
Set ”0” to parameter No.1883,1884.