Electro Cam 5000 Series - Manual (Page 51)

5-10 Programming, Optional Features
Phase Mark Registration: Option “-P” (continued)
Some registration control systems use the “Off” portion of
the input signals as the registration correction windows. In
these cases, outputs 14 and 15 will each be “On” for most
of the revolution, and off only during the registration correction
windows. The “P” option logic automatically handles these
situations.
The control assumes that “Off” registration logic is being
used whenever the “On” duration of output 14 is greater
than 180 degrees. In this “Off” logic mode, the registration
centering functions (CHN 80, CHN 81 and the Center Input)
are based on the smaller gap between the “Off” portions of
outputs 14 and 15, rather than the smaller gap between the
“On” portions. Examples 3 and 4 below are the “Off” logic
equivalents of Examples 1 and 2 on page 5-5.
Automatic Reversal of Centering Logic
CHN 81 = 0
(CENTER POSITION)
350 10
70
290
REG.
MARK TOO
SOON
REG.
MARK TOO
LATE
CHN 14
CHN 15
60˚ 60˚
90˚
180˚
270˚
Example 3
CHN 14 - ON @ 20 OFF @ 320
CHN 15 - ON @ 100 OFF @ 40
CENTER POSITION = 30
CHN 14 - ON @ 350 OFF @ 290
CHN 15 - ON @ 70 OFF @ 10
CENTER POSITION = 0
CHN 14
60˚
60˚
CHN 81 = 30
(CENTER POSITION)
40
100
20
320
CHN 15
REG.
MARK TOO
SOON REG.
MARK TOO
LATE
90˚
180˚
270˚
0˚
Example 4
“OFF” Logic Registration Examples
In examples 3 and 4, output 14 has an on duration greater than 180. Therefore, the control automatically
assumes “off” logic is being used. All center calculations and adjustments use the smaller gap between where
outputs 14 and 15 are off.
The output 14 and 15 values in example 4 are the result of the values in example 3 being shifted by 30. CHN
80, CHN 81, and the center input can be used to adjust the center value as before. The pulses programmed
in outputs 14 and 15 are automatically adjusted to correspond to the new center position.
Note: Substitute channels 7 & 8
for 14 & 15 on 9 output units.