Tweco 186 DC Inverter - Manual (Page 74)

186 AC/DC INVERTER SERVICE
POWER SOURCE PROBLEMS AND ROUTINE SERVICE REQUIREMENTS 5-4 Manual 0-5237
E. Accessories
Accessory equipment, including output leads, electrode holders, torches, wire feeders and the like shall be
inspected at least monthly by a competent person to ensure that the equipment is in a safe and serviceable
condition. All unsafe accessories shall not be used.
F. Repairs
If any parts are damaged for any reason, it is recommended that replacement be performed by an accredited
Thermal Arc Service Provider.
Power Source Calibration
A. Schedule
Output testing of all Thermal Arc Inverter Power Sources and applicable accessories shall be conducted at
regular intervals to ensure they fall within specified levels. Calibration intervals shall be as outlined below -
1. For transportable equipment, at least once every 3 months; and
2. For fixed equipment, at least once every 12 months.
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.
B. Calibration Requirements
Where applicable, the tests outlined in Table 5-3 below shall be conducted by an accredited Thermal Arc
service provider.
Testing Requirements
Output current (A) to be checked to ensure it falls within applicable Thermal Arc power source specifica-
tions
Output Voltage (V) to be checked to ensure it falls within applicable Thermal Arc power source specifica-
tions
Accuracy of digital meters to be checked to ensure it falls within applicable Thermal Arc power source
specifications
Table 5-3: Calibration Parameters
Periodic calibration of other parameters such as timing functions are not required unless a specific fault has
been identified.
C. Calibration Equipment
All equipment used for Power Source calibration shall be in proper working condition and be suitable for
conducting the measurement in question. Only test equipment with valid calibration certificates (NATA certi-
fied laboratories) shall be utilized.
5.04 Cleaning the Welding Power Source
!
WARNING
There are dangerous voltage and power levels present inside this product. Do not attempt to open or
repair unless you are a qualified electrical tradesperson. Disconnect the Welding Power Source from
the Mains Supply Voltage before disassembling.
To clean the Welding Power Source, open the enclosure and use a vacuum cleaner to remove any accumulated
dirt, metal filings, slag and loose material. Keep the shunt and lead screw surfaces clean as accumulated foreign
material may reduce the welders output welding current.