7 MAINTENANCE
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© ESAB AB 2021
7
MAINTENANCE
7.1
Routine service and calibration requirements
Maintain more often if used in unfavorable conditions.
WARNING!
Maintenance and repair work should be performed by an experienced person, and
electrical work only by a trained electrician.
WARNING!
The mains supply must be disconnected during cleaning and maintenance.
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 ESAB's original specifications.
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, including 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 ESAB inverter power sources shall be measured at a
voltage of 500 V between the parts, see "Minimum insulation resistance requirements: ESAB
inverter power sources" section. 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requirements set out below shall be withdrawn from service and not returned until repairs have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.
Table
19:
Minimum
insulation
resistance
requirements:
ESAB
inverter
power
sources
Components to be tested
Minimum
insulation
resistance
(Mohm)
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
Earthing
The resistance shall not exceed 1 ohm between any metal of a power source where such metal is
required to be earthed, and
1. The earth terminal of a fixed power source; or
2. The earth terminal of the associated plug of a transportable power source
