Newall E Série Notice Technique page 14

Réglage
(h) Error Compensation
ERROR COMP
Options: ERR. OFF
LIN. COMP
SEG. COMP
Scroll through the available options using the
arrow keys and select desired compensation with
[ENT]
(i) Set Error Compensation - Linear Error Compensation
ERROR SET
SEL.AXIS
Select the axis to be compensated using the axis
keys.
The axis displays will show which axes have been
selected for linear
error compensation.
ENT. COMP
The factor may be directly entered.
Load the required factor.
A Linear Error Compensation factor of 1.000000
is equivalent to
no compensation
ENT. COMP
13 Newall Measurement Systems
Errors can result from a number of sources, including
ent
installation and machine wear.Where the degree of error
increases linearly along the length of travel of the encoder,
X
Linear Error Compensation should be applied. However, where
the errors are local to an area of travel, the Segmented Error
Y
Compensation should be applied.
Z
>
Press the [ > > ] key to move to the next menu option.
ent
Linear Error Compensation allows the operator to apply a
ent
constant correction factor to all measurements displayed.
Linear error may occur if the axis of the machine is not
running perfectly parallel to the scale (cosine error) or if the
X
machine is moving in an arc (Abbé errors).The causes may be:
1. Machine wear.
Y
2. Deflection of the machine due to weight acting on an
overhanging section.
Z
3. Misalignment of the scale due to poor installation.
The further away the scale is mounted from the centre line of
the workpiece, the greater is the potential for linear error.
Linear Error Compensation is expressed as a multiplier,
which is displayed for each axis when ENT. COMP is selected. A
factor of 1.000000 indicates no compensation.
The compensation factor is:
A gauge block, standard bar or laser measurement should be
used as the standard against which the displayed movement is
compared.
ent
Press the [ > > ] key to select another axis for compensation.
>
Alternatively, the factor may be automatically calculated and
>
entered.When ENT. COMP is displayed press the
[ > > ] key to enter the routine
.
1 0 5
0
IMPORTANT:
If Error Compensation is applied, it is important that is
absolutely correct. If it is not correct, errors could be
increased rather than reduced.
True or standard distance moved
Measured distance