Tweco 51 with SL100SV CutMaster - Manual (Page 78)

SERVICE 5-14 Manual 0-4640
5
Locate your symptom below:
A. Main power line fuses blow as soon as main disconnect is closed
1. Input power cable installed incorrectly or defective power cord.
a. Refer to Subsection 5.11-I and check that the input power cable is not defective or installed incorrectly.
2. Main input contactor (W1) stuck.
a. Check contactor. Replace if stuck.
B. Main power line fuses blow immediately after the ON/OFF Switch is turned on.
1. Faulty Input Diode
a. Test Input Diode per Subsection 5.08-C; repair as necessary.
C. Fan do not operate; AC indicator OFF
1. Front Panel ON/OFF switch in OFF position
a. Place switch to ON (up) position.
2. Main power disconnect open
a. Close main power disconnect.
3. Torch is not properly connected to Power Supply.
a. Check torch connections to Power Supply. Tighten or adjust as needed.
4. Shield cup not fully tightened on torch head.
a. Check shield cup for proper installation. Do not overtighten.
5. Main power line fuses blown
a. Replace main power line fuses.
6. Improper input power cable connections inside Power Supply
a. Refer to System Schematic and correct if needed.
7. Defective input power cable
a. Replace input power cable. Refer to subsection 5.11-I.
8. Fuse blown inside Power Supply
a. Replace internal Fuse per Subsection 5.11-A.
9. Line voltage above 10% tolerance (over voltage protection)
a. Reduce line supply.
10. Faulty Auxiliary Transformer (refer to Appendix pages, 28 VAC Circuit Diagram)
Measure for 28 VAC on Main PC Board from J5-1 to J5-3.
a. If voltage is not present, replace the Main PC Board.
11. Faulty ON/OFF switch
Measure for 28 VAC on the Main PC Board between J3-5 to J3-6.
a. If voltage is not present replace the ON/OFF Switch.
12. Faulty Main PC Board
Measure for 12 vdc on Main PC Board from TP5 to TP1.
a. If voltage is not present, replace the Main PC Board.