Illinois Tool Works IJ300, Operation Manual

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Controller
Appendix B: Theory of Operation
5760-121 Operations Manual Rev B Page 77 of 115
Appendix B: Theory of Operation
Functional Description
The IJ3000 ink jet system prints text, autocodes (such as product counts or time and date
stamps), bar codes, and/or graphics onto products as they travel by conveyor past station-
ary print heads. Print can be on any one of, or a combination of, the product's sides. The
conveyor speed is monitored using a variable speed encoder or a built-in fixed speed
encoder. Products are detected using a photosensor. The information to be printed is
defined as a message and is programmed into the controller via a user interface.
Controller Features
The IJ3000 controller has a graphical user interface consisting of a color LCD, touch
screen, and 70-key QWERTY keypad. Also housed in the controller are a CPU Board, one
or two Print Head Interface Boards and a Display Interface Board.
Power
One or two 24VDC (Impulse Jet) or 15VDC (Integrated Valve) desktop power supplies pro-
vide power to the IJ3000 and all of its attachments. Power enters the IJ3000 through J5 (IJ)
or J3 (IV) on the Print Head Interface Board(s). A system with a single interface board has
one power supply; two interface boards require two power supplies.
On each Print Head Interface Board, 24V (IJ) or 15V (IV) is routed to the photosensor con-
nector (P2) and the print head connector (P1) through normally energized relay K1. On
Impulse Jet systems, an under voltage detection circuit de-energizes K1 and removes
power from the print heads and photosensor if the voltage is less than 18V. On Integrated
Valve systems, an over voltage circuit de-energizes K1 and removes power from the print
heads and photosensor if the voltage exceeds 18V.
Battery Backup - A 3V battery on the CPU Board (BT1) maintains the contents of system
SRAM and keeps the real time clock running during power outages or when the IJ3000 is
not plugged into a power outlet.
Power Distribution - Refer to the illustration below. 24V (IJ) or 15V (IV) from the first Print
Head Interface Board only (the one immediately above the CPU Board) is routed to the
CPU Board, where it is stepped down to the 12VDC and 5VDC used to power the rest of
the system. 12V goes to the Display Interface Board where it powers the backlight inverter,
and 5V is distributed throughout the CPU Board, to the Display Interface Board, and to the
Print Head Interface Board(s).
Please note that power is applied to the IJ3000 even when it is "turned off." When turned
off using the OFF button on the keyboard, the IJ3000 enters a sleep mode where it
responds to nothing but the ON button. All voltages are present while sleeping. The only
way to completely remove power is to pull the plug.
24V in (Impulse Jet)
15V in (Integrated Valve)
PRINT HEAD INTERFACE BOARD #2
PRINT HEAD INTERFACE BOARD #1
CPU BOARD
DISPLAY INTERFACE BOARD
24V to print heads, photosensor
and encoder (Impulse Jet)
15V to print heads, photosensor
and 5V to encoder (Integrated Valve)
5V, 12V
5V
IJ3000 POWER DISTRIBUTION
24V in (Impulse Jet)
15V in (Integrated Valve)
24V (Impulse Jet)
15V (Integrated Valve)
24V to print heads, photosensor
and encoder (Impulse Jet)
15V to print heads, photosensor
and 5V to encoder (Integrated Valve)