119
EN
Electrical tests
- All housing components must be
fitted
- The ground conductor resistance
may not exceed < 0.3 Ω (for mains
cables up to 5 m; extra 0.1Ω for each
additional 7.5 m; max. 1Ω)
- The measuring current must be no
lower than 200 mA (recommendation:
10 A)
- Mains cable: the measurement must
be taken from the ground conductor
contact of the mains plug to a reliable
earthing point (e.g. the mounting
screw of a side panel). While this
measurement is being carried out,
mains cables should be bent, flexed
and twisted along their entire length,
particularly where they enter the
housing, so that any breaks in the
ground conductor can be detected.
Ground conduc-
tor resistance
1 Measuring device
2 Welding system
9 Instrument leads
- Furthermore, measurements must be taken from the ground conductor contact of
the mains cable or from a reliable earthing point to all earthed housing components
that can be touched from the outside (gas connection, lid, side panels, front and
rear panels of power source and cooling circuit).
The mounting screw of the particular component can be used as the measuring
point.
- The highest measured value must be entered in the test record
IMPORTANT! Screws visible from the outside have a die ring, which is needed to
ensure reliable earthing of the respective components. The use of any other type of
screw is therefore prohibited.
IMPORTANT! The side panel on the wire-feed unit side of the TPS 2700 power source
is not part of the earthing concept and does not have to be tested.
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