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Background
The pressure switch is a normally closed (low air pressure) switch that connects via a 3.5 mm jack into the back of the mounting plate on Legacy ATC’s. On the M style tool changers, they are located on the underside of the ATC electrical box, and are connected with two wire leads directly to the ATC board. When the switch has above 90 PSI it opens. The ATC control board looks for this open signal to indicate there is adequate air pressure.
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Verify
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Air Pressure at your FRL and
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Compressor
Reason: Air pressure too low.
For a properly function ATC and Power Drawbar, your machine FRL should be set between 90-120 PSI.
Disconnect and/or
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Replace the
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Sensor
Reason: The air pressure sensor is faulty.
Disconnect the two wire leads from the ATC board, which opens the circuit and allows the machine to run.
Recalibrate the
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Sensor
Reason: The air pressure sensor needs to be calibrated.
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