Tweco 51 with SL100SV CutMaster - Manual (Page 89)

Manual 0-4640 5-25 SERVICE
5
5.07 Main Arc Problems
Locate your symptom below:
A. Main cutting arc will not start
1. Work cable not connected.
a. Connect work cable.
B. No cutting output
1. Torch not properly connected to power supply
a. Check that torch leads are properly attached to power supply
2. Shield cup not properly installed on torch
a. Check that shield cup is fully seated against torch head (do not overtighten)
3. Parts - In - Place (PIP) not satisfied.
a. Check that shield cup is properly installed.
b. Check switch in machine torch head for continuity.
4. Faulty components in torch and leads assembly
a. Inspect torch assembly and replace if necessary.
C. Limited output with no control
1. Poor input or output connections to power supply
a. Check all input and output connections.
2. Faulty components in torch and leads assembly
a. Inspect torch assemblies and replace if necessary.
D. Erratic or improper cutting output
1. Poor input or output connections to power supply
a. Check all input and output connections.
2. Current set too low at power supply
a. Increase current setting.
3. Torch is being moved too fast across workpiece
a. Reduce cutting speed.
4. Holding too high of a standoff.
a. Refer to recommended standoff heights provided in speed charts in Section 3. Adjust as needed.
5. Workpiece is painted or rusty.
a. Clean workpiece.
6. Faulty Main PC Board or Logic Board.
a. Measure for ±0 vdc at TP2 to TP1 on the Logic Board when attempting to transfer. Refer to Logic Board Layout.
• If TP2 goes to 0 vdc replace Output Board.
• If not, replace Main PC Board.