Tweco CutMaster 101 with SL100SV - Manual (Page 84)

SERVICE 5-20 Manual 0-4642
5
C. Torch will not pilot; AC , GAS , and TEMP indicators ON
1. Air flow blocked
a. Check for blocked air flow around the unit and correct condition.
2. Unit is overheated
a. Let unit cool down for at least 5 minutes. Make sure the unit has not been operated beyond Duty Cycle limit. Refer
to duty cycle data in Specifications Section.
3. Input line voltage is low
a. Check and connect to proper input power line.
4. Faulty Temperature Sensor / Switch
a. Refer to Appendix 15, Main PC Board Layout. Check IGBT Heatsink Temp Sensor (TS1). Disconnect wire connector
P29 from terminal J29 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. Check Inductor Temp Switch (TS2). Disconnect wire connector P32 from terminal J32 on Main PC Board. Check
connector pins 1 and 2 for at least 12K ohms. If resistance is less than 12K ohms, replace output inductor (L1). If temp
switch is open, replace Main PC Board.
5. Faulty Logic PC Board
a. Check for (±) 12vdc on Main PC Board between J43-9 and TP1. If (±) 12vdc is present, replace Logic PC Board.
6. Faulty Main PC Board
a. Check for (±) 0 vdc on Main PC Board between J43-9 and TP1. If (±) 0 vdc is present, replace Main PC Board.
7. Faulty Fan(s)
Measure for (±) 230 VAC on the Main PC Board from J15-1 to J15-5, and from J15-2 to J15-6.
• If voltage at J15-1 to J15-5 is correct, replace upper Fan (M1).
• If voltage at J15-2 to J15-6 is correct, replace lower Fan (M2).