Tweco FP-38 Power Supply - Manual (Page 32)

SERVICE 5-6 Manual 0-2967
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 in Section 5.03-C-E. 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. (Torch connection to power supply is loose.)
a. Release torch trigger, and set ON / OFF switch to OFF (down). Tighten torch connector to receptacle on
power supply securely. Do not use tools. Set ON / OFF switch to ON (up).
4. 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; AC indicator ON, Gas indicator OFF
1. Gas pressure below minimum for power supply operation
a. Set gas pressure to 65 psi / 4.5 bar
D. Torch will not pilot; AC indicator ON, Gas indicator ON (on system start-up); Gas indicator goes out
when user presses torch trigger
1. Gas pressure below minimum for torch operation
a. Set gas pressure to 65 psi / 4.5 bar
E. AC indicator flashing; Temp indicator flashing slowly
1. Fan disconnected or blocked.
a. Clear fan if blocked; let power supply cool off.
b. Connect wires to fan if necessary.