Kemppi Kempomat 2500 - Manual (Page 17)

EN
pilot lamps of the machine report about electric function:
The green pilot lamp indicating that the machine is ready for operation is always illuminated,
when the machine is connected to mains voltage and you have selected welding voltage
range from the main switch.
The yellow pilot lamp for thermal protection is illuminated, when thermal protection of the
welding circuit has released due to overheating. The protection releases if the power source is
continuously loaded over rated values or the cooling air circulation has been obstructed.
The cooling fan is cooling down the machine and after the pilot lamp has switched off, the
machine is again ready for welding from the gun trigger.
Control fuse
On the rear plate of the power source the fuse 8 A delayed is the short-circuit protection. Use
the fuse size and type according to markings. Damage caused by a wrong type fuse is not
covered by the guarantee. If the fuse is blowing again, send the unit to service.
4.5 adjustment FOr arC rOughness
Arc roughness is adjusted by connecting the return current cable to the applicable one of the
two dix-connectors on the front plate.
The connector marked with symbol I gives a rougher arc, which is used for welding of thin
sheets and ferrous metals by 0.6 - 1.0 mm wires and especially with CO² shielding gas. The
connector marked with symbol II is suitable for thicker wires and especially for aluminium and
stainless materials. The most suitable roughness is, however, most dependent on the welding
case. You will find the best position by testing the different positions.
4.6 OperatiOn OF COOling Fan
The cooling fan on the rear plate of the Kempomat machine is started and stopped according
to use. The cooling fan is started after ca. 15 s after weld start and stopped after ca. 10 min
after weld end or release of the overheat protection.
NOTE! The fan is intaking air from rear plate side! Don´t switch off the unit with the main switch
before the cooling fan has automatically stopped. By open circuit the cooling fan does not get
started.
5. COntrOl panels and adjustments
5.1 wire Feed speed pOtentiOmeter
The wire feed speed is adjusted steplessly with the potentiometer on the front panel, see the
paragraph Panels. The potentiometer has the memory scale for max. speeds of 18 m/min and
25 m/min. See the section Installation of wire feed equipment, paragraph 3. Max. wire feed
speed.
5.2 burn baCK time
Different filler materials and shielding gases behave in different ways in the welding end, so
that you should switch off the welding current with a delay, which is suitable for wire feed
stopping according to the welding case.
If you try to end welding with an unsuitable burn back time, the wire will burn in the contact
tip, there will be too big “balloon” at the wire end, or the wire will stick at the ending point.
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Kempoma
t 2500, 3200, 4200 / © Kemppi O
y / 1117