Section 4 - Alignment & Calibration
4-15
1)
1
(Tolerance). The
±
position tolerance, in encoder ticks, for absolute moves. The
calibration program sets this field to the value found in the corresponding
calibrate_position
field in the MOTOR_AY.PRO file.
2,3)
2288,41187
(NumberOfSteps,StepDistance). The number of motors steps
corresponding to the step distance in microns. The ratio of these two numbers
determines the step size (41187/2288
≅
18 microns). The calibration program sets
these fields to the values found in the corresponding
calibrate_position
fields in the
MOTOR_AY.PRO file. Since these values are a property of the mechanical design of
the system, they should never change.
4,5)
209,61339
(NumberOfTicks,TickDistance). The number of encoder ticks
corresponding to the tick distance in microns. Again, it is the ratio of these two
numbers (61339/209
≅
293 microns) that determines the encoder calibration. These
numbers will generally change from calibration to calibration (although the ratio
should remain approximately the same).
6)
363
(EncoderOffset). The value subtracted from the encoder readback to set the origin
of motion. The origin of AY motion is the extreme right mechanical stop, so this value
should be the same as the first field below.
7,8)
363,3719
(NegLimit,PosLimit). The encoder readings for the negative (right) and
positive (left) mechanical stops.
The
pos_limit_position
and the
neg_limit_position
are the limits of motion, in microns, in
the positive and negative direction.
Note:
The
PosLimitOffset
and
NegLimitOffset
entries in the
[AyMotor]
section of the
hardware.ini
file determine the motion limits relative to the mechanical stops. If these
entries are not present, or are zero, the motion limits are set to the mechanical limits, as in
the above example).
Type
Y<Enter>
to accept the calibration values or
N<Enter>
to reject them.
Note:
The last calibration scan data is saved in the file
MOTOR_AY.DAT
. You can reanalyze
the data–e.g., after editing
hardware.ini
–by typing the command
CALIBRATE
@MOTOR_AY.DAT
at the MOTOR$AY> prompt in SQDRIVER.EXE.
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