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An example of this application is as follows:
A 600 pulse-per-revolution encoder is used to measure cable before it is cut to the proper
length. There is a wheel (one foot in circumference) attached to the encoder, in direct contact
with the cable. The user wants to see the counter display feet to 1/100’ accuracy (to two deci-
mal points).
With the default prescale of 1.0, one rotation of the wheel would be displayed on the counter
as 00.0016’. However, by using a prescale of 0.01, the resolution has been multiplied by 100,
allowing the counter to display 0.16667, increasing the accuracy of the counter and allowing
more accurate cutting.
1)
To access the prescale parameters, enter the Programming Mode, and press until the
count setup menu category is reached.
2)
Press to continue to the Parameter Name prescl. The display will flash between prescl
and the default value of 1.0. When the display shows 1.0, press .
3)
Use the arrow keys to scroll through the choices. Press when correct prescale is se-
lected to accept the value and proceed to the next parameter, Count Scale.
User-defined Scale
The S663 also allows for a user-defined scaling multiplier.
1)
To access the user-defined scaling parameter, enter the Programming Mode, and press
quntil the count setup menu category is reached. Press .
2)
Pressqto continue to the Parameter Name scale. The display will flash between cscale and
the default value of 01.0000. When the display shows 01.0000, press .
3)
Use the arrow keys to enter the correct value of the flashing digit. Use the key to
advance to the next digit. Press when the correct scale is selected to accept value and
proceed to the next parameter, Count DP.
To calculate the scaling parameter, use the following scale formula:
Display = Multiplier (Pulse x Prescale x Scale x Decimal Point)
If the scale value isn’t known, use the following formula:
For the example we used, the scale value is:
Decimal Point Position
1)
To set the Decimal Point position, enter the Programming Mode, and press until the
count setup menu is reached.
2)
Press and then to continue to the Parameter Name dp. The display will flash be-
tween dp and the default 000000. When the display shows 000000, press .
3)
Use the arrow keys to scroll through the choices. Press when the correct decimal
place is selected to accept value and proceed to the next menu category, Rate Mode setup.
SCALE =
DISPLAY X Dp
MULT. (PULSE X PRESCALE)
SCALE =
1.00
1 (600) X 0.01
= 0.1667
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
RESET
ENTER
ENTER
ENTER
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