4.13 Anti-Jam Adjustment
The anti-jam device is designed to protect the T-1000 from damage when an obstruction is
encountered in the seal area (area between the pressure bar and front (gripper) plate). If properly
adjusted, the pressure bar will retract if an obstruction is encountered in the seal area. The
pressure bar houses springs which cause the rubber and holder to compress. When the rubber
holder compresses, a sensor is activated causing the pressure bar to retract. The sensor is
defeated when the pressure bar is approximately 1/8" from the gripper plate (Fig. 4-21). The
anti-jam can quickly be tested while the T-1000 is operating using care, but should be thoroughly
tested by disconnecting air and power and removing covers.
To quickly test the anti-jam device, place a 3/8" diameter flexible poly tube against the front
(gripper) plate perpendicular to the seal bar opening. Press the foot switch allowing the pressure
bar to compress the poly tube against the front plate. If the pressure bar does not immediately
retract and place the T-1000 in the STOP mode, the anti-jam device is not properly adjusted.
Test the anti-jam device along the entire length of the pressure bar using the 3/8" poly tubing as
a test device.
CAUTION: To avoid personal injury, do not place fingers or hands into the seal area of the
T-1000 while power is ON or air is attached. Do not test the anti-jam device with hands or
fingers. Ensure the poly tube which is used for testing is long enough to keep fingers or hands
away from the seal area of the T-1000.
To thoroughly test and adjust the anti-jam device, you must first turn the power to the OFF
position, disconnect the air line from the T-1000 and remove the top and left side cover. With
the covers removed and air disconnected, turn the power to the ON position.
To test the pressure bar sensor, locate the "X3" LED on the PLC Board (Fig. 4-8) and ensure the
light is illuminated (ON). Then, compress the rubber and holder into the pressure bar (nylon
holder). As soon as the rubber is pressed into the nylon holder, the "X3" LED should turn OFF.
The LED should remain OFF while the rubber is held compressed into the nylon holder. If the
"X3" LED shuts OFF while the rubber bar is pressed into the nylon holder, the pressure bar
sensor is functioning properly.
To test the anti-jam override sensor, locate the "X7" LED on the PLC board (Fig. 4-8) and
ensure that the light is OFF. Then, standing in front of the T-1000, push the pressure bar slowly
towards the front plate, keeping hands and fingers out of the seal area. While pushing the
pressure bar towards the front plate do not compress the rubber into the nylon holder or touch the
round nuts on the pressure bar (Fig. 4-21).
When the pressure bar rubber is approximately 1/8" from the front plate, "X7" LED should
illuminate (ON).
If the LED illuminates prematurely (when the rubber is farther than 1/8" from the front plate),
the anti-jam override sensor must be adjusted. An aluminum block, located on the right guide
rod in the inner frame, houses a magnet (Fig. 4-22). The anti-jam override sensor detects the
magnetic field sending the signal to the PLC. If illuminated prematurely, the "magnetic block"
should be moved toward the front of the T-1000 along the guide rod.
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