Tweco 181i Thermal Arc Fabricator - Manual (Page 84)

Fabricator 181i
Trouble ShooTing and Service 5-2 Manual 0-5191
FAuLT CAuSE rEMEDY
8 gas flow continues after
the torch trigger switch has
been released (Mig mode).
gas valve has jammed open
due to impurities in the gas or
the gas line.
have an accredited Thermal arc
service provider repair or replace
gas valve.
9 Power indicator will not
illuminate and welding arc
cannot be established.
The electricity Supply voltage
has exceeded voltage limits of
the Power Source.
ensure that the electricity Supply
voltage is within 208-265 vac.
10 Tig electrode melts when
arc is struck.
Tig Torch is connected to the
(+) ve terminal.
connect the Tig Torch to the (-) ve
terminal.
11 arc flutters during Tig
welding.
Tungsten electrode is too large
for the welding current.
Select the correct size of tungsten
electrode. refer to Table 4-7.
Table 5-1
5.02 routine Service and Calibration requirements
wArNING
There are extremely dangerous voltage and power levels present inside this Power Source. do not
attempt to open or repair unless you are an accredited Thermal arc Service Provider. disconnect the
Welding Power Source from the electricity Supply voltage before disassembling.
routine Inspection, Testing & Maintenance
The inspection and testing of the Power Source and associated accessories shall be carried out in accordance
with Section 5 of en 60974-1: Safety in Welding and allied Processes-Part 2 electrical. This includes an insulation
resistance test and an earthing test to ensure the integrity of the Power Source is compliant with Thermal arc's
original specifications.
if equipment is to be used in a hazardous location or environments with a high risk of electrocution as outlined in
en 60974-1, then the above tests should be carried out prior to entering this location.
A. Testing Schedule
1. For transportable equipment, at least once every 3 months; and
2. For fixed equipment, at least once every 12 months.
The owners of the equipment shall keep a suitable record of the periodic tests and a system of tagging, includ-
ing the date of the most recent inspection.
a transportable Power Source is deemed to be any equipment that is not permanently connected and fixed in
the position in which it is operated.
NOTE
Please refer to local guidelines for further information.
B. Insulation resistance
Minimum insulation resistance for in-service Thermal arc Power Sources shall be measured at a voltage of
500v between the parts referred to in Table 6-1below. Power Sources that do not meet the insulation resis-
tance requirements set out below shall be withdrawn from service and not returned until repairs have been
performed such that the requirements outlined below are met.