Tweco 211i Fabricator - Manual (Page 84)

FABRICATOR 211i PROBLEMS/SERVICE
PROBLEMS AND ROUTINE SERVICE 5-2 Manual 0-5157
FAULT CAUSE REMEDY
7 No gas flow in MIG mode. A Gas hose is damaged. A Replace or repair.
B Gas passage contains
impurities.
B Disconnect gas hose from the
rear of power source and blow
out impurities.
C Gas regulator turned OFF. C Turn ON regulator.
D Empty gas cylinder. D Replace gas cylinder.
8 Gas flow continues after
the 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 Tweco ser-
vice provider repair or replace
gas valve.
9 Power indicator will not
illuminate and welding arc
cannot be established.
The Electricity Supply has
exceeded voltage limits of
the power source.
Ensure that the Electricity Sup-
ply is within 115V ± 10% or
208/230VAC ± 10%.
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 cur-
rent.
Select the correct size of tung-
sten electrode. Refer to Table
4-7.
Table 5-1: Power Source Problems
5.02 Routine Service and Calibration Requirements
WARNING
There are extremely dangerous voltage and power levels present inside this Inverter Power Source.
Do not attempt to open or repair unless you are an accredited Tweco Service Provider. Disconnect the
Welding Power Source from the Electricity Supply before disassembling.
Routine Inspection, Testing & Maintenance
The inspection and testing of the power source and associated accessories shall be carried out by a licensed
electrician. This includes an insulation resistance test and an earthing test to ensure the integrity of the unit is
compliant with Tweco's original specifications.
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.
B. Insulation Resistance
Minimum insulation resistance for in-service Tweco Inverter Power Sources shall be measured at a voltage
of 500V between the parts referred to in Table 5-2 below. Power sources that do not meet the insulation
resistance 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.