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display the Inputs/Outputs. Locate X2 and X4 input LEDs on the touch screen.
6. By manually pulling out and pushing in the pressure bar, keeping it parallel to the PTFE Anti-Stick
Sheet, X2 and X4 should come ON at the same time before the spring-loaded gripper plate moves. It is
important that the inputs come on at the same time and that when they do, the pressure bar rubber is close
to the gripper plate.
7. To adjust the sensitivity of the sensors, loosen the retaining claim by turning the screw located on the
black magnetic sensor, positioned at the end of the cylinders. Then, slide the sensor along the cylinder to
achieve the correct input results.
8. Test the circuit by manually pushing in the pressure bar. Again, the magnetic cylinder sensors in the
proper position if the X2 and X4 inputs come on at the same time and when they come on, the pressure
bar rubber is near the gripper plate.
9. Turn of the power OFF, replace all covers, apply air and power and test cycle the machine, further
testing the anti-jam circuit.
Test 2: With air applied and the power on, position a stiff object of at least 1/4” in thickness on the far
left side of the seal bar. Then, push the spring-loaded gripper plate with the object so that it moves
inward. While pressing in the spring-loaded gripper plate, X7 input should light up, and the screen
Will display “Please check left heat bar sensor” See Fig. 3-25, repeat same test for right side sensor
looking for X6 input and “please check right side heat bar sensor”
If pushing the gripper plate in on either side fails to light its respective input, follow the following
procedure.
1. Remove air from the unit, turn the T-300 power “OFF” and unplug the power cord and wait until the
heater bar is fully cooled down.
2. Remove the top (stainless) cover and side (painted) cover.
3. Locate and inspect the two photo sensor boards and ensure that the two rectangular black and white
photo components are flat and parallel to each other. If not, carefully reposition the sensors.
4. Turn the power ON and locate the two photo sensor printed circuit boards. You should notice that a
threaded rod extends through the photo eyes. The threaded rods move inward and outward with the
movement of the spring-loaded gripper plate. Additionally, when the threaded rod enters the photo
sensor, X7 (left sensor input) and X6 (right sensor input) are lit on the PLC.
5. Turn the power ON and test the X7 and X6 inputs by pressing inward on the spring-loaded gripper
plate. You will notice also, that the touch screen displays a message for both the left and right photo
sensors.
6. When the spring-loaded gripper plate is not pressed (home position), the X6 and X7 inputs should be
off and the touch screen should display a normal operation. However, when the spring-loaded gripper
plate is pressed slightly inward; the inputs should come on and the Warning message displayed. You will
notice that the Warning message is displayed when the rod passes through the photo sensors.
7. To adjust the sensitivity of the spring loaded “U” channel, loosen the nut on the left rod. With the
spring loaded gripper plate in the HOME position, turn the threaded rod with a flat head screwdriver, so
that the spring-loaded gripper plate when slightly pressed, causes the X7 to come on.
4.13 Replace Thermocouple Wire
A thermocouple wire, brazed to a ring terminal and secured to the bottom of the heater bar, detects the
amount of heat the heater bar is emitting. The thermocouple wire is considered a normal wear item and
will infrequently fail, requiring replacement.
The thermocouple should be replaced when excessive fluctuations occurs or incorrect temperature is
displayed in the Bag Setup menu. The thermocouple should also be replaced when a visual inspection
reveals frayed insulation or broken wire. If the above conditions are met, the thermocouple is bad and the
current to the heater bar has been turned OFF.
To replace the thermocouple wire, turn the main power to the OFF position, unplug the power cord and
disconnect the air line.
