Tweco 51 with SL100SV CutMaster - Manual (Page 80)

SERVICE 5-16 Manual 0-4640
5
4. Faulty Temperature Sensor / Switch
a. Shut input power off. Check IGBT Heatsink Temp Sensor (TS1). Disconnect wire connector P2 from terminal J2 on
Main PC Board. Check connector pins 1 and 2 for 10K ohm (±25%) (at ambient temperature). If resistance is not 10K
ohm (±25%), replace TS1.
b. Shut input power off. Check Inductor Temp Switch (TS2). Disconnect wire connector P23 from terminal J23 on Main
PC Board. Check connector pins 1 and 2 for resistance. If resistance is greater than 12K ohms, replace output inductor
(L1). If temp switch is open, replace Main PC Board.
E. No gas flow; AC indicator ON; TEMP , GAS and DC indicators OFF
1. RUN / RAPID AUTO RESTART / SET switch in RUN position
a. Change switch to SET position.
2. Gas supply not connected to unit
a. Connect to gas supply.
3. Gas supply not turned on
a. Turn gas supply on.
4. Faulty RUN / RAPID AUTO RESTART / SET switch
a. Check continuity.
5. Faulty Gas Solenoid circuit
a. Test Gas Solenoid circuit per Subsection 5.08-E; repair as necessary.
6. Faulty Logic Board
a. Replace logic board
F. Gas flows; AC indicator ON; GAS and DC indicator OFF
1. Gas pressure too low
a. Set operating pressure per pressure setting label on power supply.
NOTE
Minimum pressure for power supply operation is lower than minimum required for torch operation.
2. Faulty Pressure Switch
Measure for 12 vdc from wire #10 to wire #11 at the Gas Pressure Switch, located on the right side of the unit. Refer to
System Schematic in the Appendix pages.
a. If 12 vdc is present and pressure is above 50 psi (3.4 bar), replace Gas Pressure Switch/Solenoid Assembly. Refer to
Section 5.12-E.
b. If pressure is above 50 psi (3.4 bar) and 12 vdc is not present, replace the Logic PC Board.
3. Faulty Wiring or Faulty Logic PC Board
Check for 12 vdc at Main PC Board pin J24-3 to J24-4 from the Logic PC Board. Refer to Appendix Pages, Main PC Board
Layout.
• If less than a volt, replace Logic PC Board.