Operation Of The Thermal Shield; Twisting The Neck - Kemppi 25 Operating Manual

6.

OPeraTiOn OF THe THerMal sHield

Inside the plastic protection of the snap connector head, PMT / W guns have, as
an extension for a liquid-current cable, a PTC thermal shield, which in Promig
or Feed equipment switches off the welding when gun overheats. The thermal
shield prevents overheating of the liquid-current cable and other parts of the gun
in case the cooling liquid for some reason should not circulate in the gun. When
the thermal shield switches off the welding, a pilot lamp for the thermal shield of
the Promig wire feed unit is lit. It is possible to continue welding when the gun
has cooled down enough.
NOTE! The thermal shield operates only with the Promig and Feed units. The
thermal shield does not operate if the internal connections of the gun are
changed into position "FU".
If the thermal shield switches off the welding, it is likely that cooling liquid does
not circulate in the gun or that the flow is very weak. Do not continue welding
until you have cleared up the reason for the disturbance and repaired the fault.
Check the following:
• The ccooling unit is running and has enough cooling liquid.
• The cooling liquid hoses of the gun and interconnecting cable are correctly
connected and they do not have any sharp bends.
7.

TwisTing THe neCk

If necessary, you can twist gun neck of PMT 25, PMT 27, PMT 32, PMT 35 and
PMT 42 ±360° in the direction of the handle (see picture). Grip the handle
firmly with one hand and twist the neck with your other hand into the
wanted position.
EN
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