Tweco 38 CutMaster - Manual (Page 39)

Manual 0-2964 5-7 SERVICE
B. AC indicator flashing; Torch cannot be activated
1. System is in protective interlock mode. (User held torch trigger while turning on ON / OFF switch.)
a. Release torch trigger, set ON / OFF switch to OFF (down). Return ON / OFF switch to ON (up) position.
2. System is in protective interlock mode. (Torch parts are missing or loose.)
a. Release torch trigger, and set ON / OFF switch to OFF (down). Open main disconnect switch. Check torch
parts, including O - rings on torch head. Refer to illustration on page 5 - 1. Replace parts as needed. Reinstall
shield cup; hand - tighten it securely against the torch head. Close main disconnect switch. Set ON / OFF
switch to ON (up) position.
3. System is in protective interlock mode. (User removed shield cup from torch while power supply ON / OFF switch was
ON.)
a. Release torch trigger, and set ON / OFF switch to OFF (down). Set ON / OFF switch to ON (up).
C. Torch will not pilot; DC indicator and GAS indicator flash alternately when torch trigger is activated
1. Gas pressure is too low. Adjust gas pressure to 65 psi / 4.5 bar.
D. AC indicator flashing; Temp indicator ON
1. Fan disconnected or blocked.
a. Clear fan if blocked; let power supply cool.
E. AC indicator ON; TEMP indicator ON
1. Air flow blocked
a. Check for blocked air flow around the unit and correct condition.
2. Fan blocked
a. Check and correct condition.
3. 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 Section 2.
4. Input line voltage is below 100 Volts
a. Check and connect to proper input power line.
5. Faulty components in unit
a. Return for repair or have qualified technician repair per Service Manual.
F. Torch will not pilot when torch switch is activated
1. System is in SET mode
a. Change to RUN mode.
2. Faulty torch parts
a. Inspect torch parts and replace if necessary.