Mitsubishi Electric C70, Setup Manual

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Appendix 1 Explanation of Parameters
MITSUBISHI CNC
408
Appendix 1.15.2 Setting Compensation Data
Compensation data can be set according to either absolute or incremental system.
"#4000:Pinc" 0: Absolute system
1: Incremental system
(1) Absolute system
Feed from the reference point to each division point is executed as shown in the following Figure 2.1.
(Specified position – Real machine position) × 2 (Unit of output)
Set it as the compensation amount.
For example‚ assume that the feed from the reference point to the +100mm position is executed. Also‚
assume that the real machine position is 99.990mm.
(100000 – 99990) × 2 = 20 pulses
In this case‚ the above value is defined as the compensation amount used at the +100mm position:
Assume that the real machine position resulting when feed to the –100mm position is executed‚ is –
99.990mm.
(-100000 – -99990) × 2 = -20 pulses
In this case‚ the above value is defined as the compensation amount used at the -100mm position.
(2) Incremental system
The Fig. 2.2 contains a machine position that is placed in the positive direction with respect to the
reference point. Assume that feed from division n–1 to n (division interval) is executed.
(Division interval – Actual movement distance) × 2 (Unit of output)
In this case‚ the above value is defined as the compensation amount.
The following figure (right) contains a machine position that is placed in the negative direction with
respect to the reference point. Assume that feed from division point n+1 to n by the division interval is
executed. In this case‚ the following value is defined as the compensation amount: (Division in
Actual movement distance) × 2 (Unit of output)
+99.990
+100
- 99.990
- 100
Compensation
amount:
20 pulses
(10um) Compensation
amount:
-20 pulses
(-10um)
Fig. 2.1
n n- 1
l
n+1 n
l
n: Division point
compensation number
l: Division interval
Fig. 2.2 Fig. 2.3
Unit : Unit of output
Range : -128 to 127
(Note) The unit of output is used as the unit of setting.
The actual unit of compensation pulses depends on the compensation