Mitsubishi Electric M800VS Series Connection And Set Up Manual page 521

M800VS/M80V Series Connection and Setup Manual
24 Setting the Machine Error Compensation
24.2 Bidirectional Pitch Error Compensation
Setting pitch error compensation data
(1) Move the axis to positive or negative direction, then measure and record actual machine position of each division point.
Calculate compensation amount for each division point based on the actual machine position.
#4000 setting value
0
(Absolute amount method)
1
(Incremental amount method)
Note
 The unit of compensation amount depends on the setting of machine error compensation unit ("#1006 mcmpunit").
(2) Set the calculated compensation amount to the parameter of compensation No. allocated to each division point.
(-1)
(0)
(1) (3)
#4101 #4102 #4103
Direction of reference
position return
#4107 #4108 #4109
(0) (3)
(-4)
(-4)
Bidirectional pitch error (linear axis)
[Compensation amount settings]
Movement direction
Compensation data No.
Absolute amount method
Compensation
amount
Incremental amount method
IB-1501613-A
Calculation method of compensation amount (*1)
Compensation amount = (Commanded machine position - Actual machine position) × 2
Here, the compensation amount at division point "n" is calculated for the axis moved by the "interval
between division points" as specified by #4007. The formula used to calculate compensation amount
will differ depending on whether division point "n" is on the positive side or the negative side from the
reference position.
[On the positive side]
Actual travel amount = (Actual machine position of division point "n") - (Actual machine position of di-
vision point "n-1")
Compensation amount = (Interval between division points - Actual travel amount) × 2
[On the negative side]
Actual travel amount = (Actual machine position of division point "n") - (Actual machine position of di-
vision point "n+1")
Compensation amount = (Interval between division points + Actual travel amount) × 2
(1)
(-2)
(3)
(-2)
(-3) (-2) (0) (3)
#4104 #4105 #4106
Error
3
2
1
- 1
- 2
- 3
#4110 #4111 #4112
(1) (-3) (-1) (1)
(-1)
(-3)
(-4)
(-3)
#4101 #4102 #4103 #4104 #4105 #4106 #4107 #4108 #4109 #4110 #4111 #4112
-2 0
2 6 -6
Compensation amount in positive direction
(Absolute amount method)
Compensation amount in positive direction
(Incremental amount method)
Error amount in negative direction
Basic axis machine coordinate
Error amount in positive direction
Reference when the movement direction is negative
Compensation amount in negative direction
(Incremental amount method)
Compensation amount in negative direction
(Absolute amount method)
Positive
6 -4 -4 2 -8
-4 0 6 0
490
Negative
-8 -2 -6 -8 -6
6 2 -6 -2 2