Tormach 1300PL, Operator'S Manual

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9: TROUBLESHOOTING
©Tormach® 2020
Specifications subject to change without notice. Page 64 UM10720: 1300PL Operator's Manual (Version 0820B)
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9.1 OHMIC PROBING
9.1.1 Ohmic Probe Does Not Trigger.
How to test ohmic probing:
Open the electrical cabinet and locate the Tormach THCT Board (PN 39096). Have a helper touch the ground clamp to the torch cap and
watch LED D8 on the bottom left of the board. If the LED lights up when the ground clamp contacts the torch cap, the THCT board is
measuring contact between the cap and ground as intended.
Switch to the Status tab in PathPilot and repeat the test with the ground clamp. Watch the status LED for ohmic touch. If it turns green
when the ground clamp makes contact the THCT board is communicating with PathPilot correctly.
Cause: Faulty Connection Between Workpiece Clamp and Plasma Source
Probability How-To Steps Need More?
High
Check that your ground clamp is connected to your workpiece and plasma
source.
Ohmic probing detects continuity
between the torch cap and the ground
connection of the work piece. If this
connection is not solid, ohmic probing
will not trigger.
Cause: Faulty Work Clamp Connection Between Plasma Source and THCT Board
Probability How-To Steps Need More?
Low
1. Open the electrical cabinet and locate the Tormach THCT board (PN
39096).
2. Using a multimeter in continuity mode, measure continuity between J2 Pin
1 (WORK) on the Tormach THCT Board (PN 39096) and the workpiece
clamp.
3. If there is not continuity, check the that the plasma source control cable is
connected at the rear of the electrical cabinet. Pin 4 on this connector is
used for the workpiece clamp signal.
Continuity to the workpiece clamp is
measured through the plasma source
control cable Arc+ pin (since the torch
operates at a negative voltage relative
to the workpiece). If this connection is
faulty or high resistance the probe will
not trigger.