QDR
4500 Technical Manual
4-12
7.
Type Y<Enter> to accept the calibration values.
MOTOR$AY (all QDR 4500 models)
Before beginning this procedure, make sure that the AY motor encoder
is not
clamped to the
drive shaft tubing.
1.
Select the AY motor device driver by typing:
MOTOR$AY<Enter>
2.
At the MOTOR$AY> prompt in SQDRIVER.EXE, type:
CALIBRATE<Enter>
The program prompts:
Press <Enter> when the AY motor reaches the LEFT mechanical limit.
Press <ESC> to stop calibration.
The program moves the TZ motor to its topmost position and then starts AY moving to the
left. When AY hits the left mechanical stop the first time:
3.
Press <ESC>.
The program returns to the MOTOR$AY menu page (below).
In the right hand column of the display, eight lines from the bottom (and highlighted in the
figure below), is the raw a/d readback of the motor encoder (in the example below, it is
2048). Manually rotate the encoder until the readback is 3750±50 (i.e., in the range 3700-
3800) and then clamp the encoder to the drive shaft, making sure not to over stress the clamp.
4.
Repeat the calibration procedure above but now, when AY hits the left mechanical stop,
press
<Enter>
.
The program then starts AY moving to the right and prompts:
Press <Enter> when the AY motor reaches the RIGHT mechanical limit.
Press <ESC> to stop calibration.
5.
When AY hits the right mechanical stop, press <Enter>.
The program then switches to graphics mode and draws the Encoder Vs Distance calibration
grid. It steps the AY motor to the left in one inch increments until the motor hits the left
mechanical stop, and then steps the AY motor to the right in one inch increments until the
motor hits the right mechanical stop. The program plots the encoder data during the scan (in
raw encoder units, 0-4095).
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