T.L. FAHRINGER FW-200 HPA, Owner'S Manual

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FW-200 HPA, Rev. 4 2-8
FORGE PRESSURE SWITCH CALIBRATION
The forge pressure switch calibration should be checked periodically to ensure accuracy. The forge pressure is activated by the #4
sensor and disc attached to the cam shaft, and are accessed by removing machine’s the top cover.
1) Remove the left cover from the front of the machine.
2) Enter into the SETUP mode.
3) Set the timing for around 0.150”.
4) JOG the cam from weld start until the cam follower is lined up with the cam’s timing mark.
a) If the machine beeps during step 4 then the forge pressure switch calibration is very early. Proceed to step 7.
b) Otherwise proceed to step 5.
5) JOG the cam SLOWLY, by quickly tapping the ADVANCE button, from the timing mark toward the drop-off until the
machine beeps, then stop immediately.
6) The cam follower should be lined up with the cam about 1/16” above the drop-off right when the machine beeps.
(See Cam Diagram)
a) If the forge pressure is calibrated, proceed to step 12.
b) Otherwise proceed to step 7.
7) Remove the top cover from the machine.
8) Adjust the trip position, if necessary, by loosening the set screw of and turning the #4 disc.
a) CCW (in direction of cam rotation) causes the forge pressure to trip sooner.
b) CW (against direction of cam rotation) causes the forge pressure to trip later.
9) Recheck the calibration from step 4.
10) Make sure the disc’s set screw is tight. If it is not, tighten it, and then recheck the calibration from step 4.
11) Replace the top cover on the machine.
12) Replace the left cover on the front of machine.
13) Exit out of SETUP mode.
14) The forge pressure switch is now calibrated.