Tweco 350 4R Wirefeeder - Manual (Page 45)

7-1 Manual 0-5182
service weldskill 250, 350
Service
SECTION 7:
SERVICE
7.01 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 CIGWELD Service Provider. Disconnect the
Welding Power Source from the Mains Supply Voltage before disassembling.
1. 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 AS 1674.2 - 2007: 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 unit is compliant with Cigweld's
original specifications.
If equipment is to be used in a hazardous location or environments with a high risk of electrocution as outlined
in AS 1674.2 - 2007, then the above tests should be carried out prior to entering this location.
Testing Schedule
a) For transportable equipment, at least once every 3 months; and
b) 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.
Insulation Resistance
Minimum insulation resistance for in-service Cigweld Power Sources shall be measured at a voltage of 500V
between the parts referred to in Table 7-1 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requirements set out below shall be withdrawn from service and not returned until repairs have been performed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.
Components to be Tested
Minimum Insulation
Resistance (MΩ)
Input circuit (including any connected control circuits) to welding circuit
(including any connected control circuits)
5
All circuits to exposed conductive parts 2.5
Welding circuit (including any connected control circuits) to any auxiliary
circuit which operates at a voltage exceeding extra low voltage
10
Welding circuit (including any connected control circuits) to any auxiliary
circuit which operates at a voltage not exceeding extra low voltage
1
Separate welding circuit to separate welding circuit 1
Table 7-1: Minimum Insulation Resistance Requirements: Cigweld Power Sources
Earthing
The resistance shall not exceed 1Ω between any metal of a power source where such metal is required to be
earthed, and -
a) The earth terminal of a fixed power source; or
b) The earth terminal of the associated plug of a transportable power source