Electro Cam 5000 Series - Manual (Page 55)

Mode 1 Operation
Appendix A-4
Details of Mode 1 -
Alter Position from Input Signal
An output group operating in Mode 1 will have its outputs
enabled at all times. What makes it different from simple
cam logic is its ability to alter its position relationship to the
machine based on an external input signal. The start
(leading edge) of an input signal will instantly cause the
group’s position to be reset to zero. The outputs will
immediately update in accordance with the zero position
and continue cycling from that point.
The input signal acts in a momentary manner, therefore it
doesn’t matter how long the input remains energized. The
reset to zero operation will occur when the leading edge of
the input signal occurs. However, once the reset occurs,
the control disarms the input and ignores it until it becomes
re-armed. A programmed window determines where the
input will become re-armed (re-arming the input is similar
to cocking a gun; once it is re-armed it can fire at any
position).
The input window is programmed in the same manner that
output pulses are programmed and is referenced to the
corresponding group position. Channel 91 is the window
for Group 1, Channel 92 for Group 2, and so on up to 98.
The position where the window is programmed determines
if the input is re-armed right away or ignored until a specified
number of degrees of travel occur. The window can be
reached from either direction of travel. Therefore, the on
edge of the window determines how much forward travel is
needed to reach the window, and the off edge determines
how much reverse travel is needed.
The position reference that is established by input signals
does not get stored in the control’s permanent memory.
Therefore, when the control powers up, a Mode 1 group
will assume the last offset programmed through FCN 2.
On power up, the input is armed and the first signal received
will cause the position to immediately reset to zero.
Example Application: Control sections of
a machine that vary in phase relationship
This illustration shows a single PLuS control
and resolver controlling three “Adjustable
Phase" sections of a converting machine. The
rotary position of the electrical output signals
can be manually set/adjusted from the
keyboard or automatically adjusted by sensors.
This keeps the electrical control signals properly
synchronized to the mechanical devices in each
section when phase adjustments are made.
One resolver provides the position information
needed for all sections of the machine,
regardless of their phase relationship.
Note: All gear drives are 1:1 ratio.
PGM CHN
FCN
1 2 3
4 5 6
7 8 9
0
C LR
C L E
EN T
ON/OFF
SET PT
M OT IO N
P O W E R
CP U
5000 Series Programmable Limit Switch
0)
1)
2)
3)
4)
5)
Offset
Motion
Detection
Active
Program
Speed
Compensation
DEG/1000 RPM
Timed
Outputs
Program
Enable Code
SECTION 2
SECTION 1
SECTION 3
Line Shaft
Mode 1 Example Application
Additional output groups can
be controlling other machine
functions in different
“Modes” as needed.
Group 3
Input Signal Group 2
Input Signal Group 1
Input Signal
Differentials allow the
mechanical phase of each
section to be adjusted Resolver
(1:1 Ratio)
Each output group instantly resets it position when its input sensor energizes.
How to Program Mode 1 Operation
1. Program FCN 8 and FCN 9 to correctly establish
the output grouping and modes required for this
machine application (insure that Mode 1 is selected
for this group).
2. Program the input window (CHN 9X) to start where the
group enable input should be re-armed when the
machine is moving in a forward direction and to end
where the input should be re-armed if the machine is
moving in reverse. If the input should always be armed,
program CHN 9X to start on 1 and end one increment
before zero.
Note: The group input window (CHN 9X) and the group
output position setpoints must be programmed individually
for each of the controller programs used. Different programs
can have different values as required.
If the output group position fails to reset when input signals
occur, insure that an input window (CHN 9X) is programmed
and that the input is wired to the control correctly.