Kemppi KEMPOMIG 3200 Service Manual page 11

DISTURBANCE
Error code E08 is shown on the
panel display
The equipment welds ok on spray
arc values, but on short- and
globular-arc it is impossible to
weld
The power source doesn´t start
the cooling unit
The equipment welds poorly on
short- and globular arc
The arc is intermitted and
overheat signal lamp is flashing
at the same time
Wf-unit doesn´t control the
power source
POSSIBLE CAUSE
Faulty welding gun
Faulty wf-unit control card
A001
Faulty intermediate cable
Faulty intermediate cable
Faulty power source control
card A001
Faulty power source control
A002
Power source´s control card
A001
DC-link overvoltage
Faulty intermediate cable
Faulty aux. transformer
Faulty control card A001
REMEDY
Check the welding gun condition
Check the wf-unit´s zener diodes
V27 and V28 (24 V/5 W) on
control card A001. If these diodes
get damaged, there is an insulation
problem in the welding gun
between welding circuit and start
wires
Check the intermediate cable
between wf-unit and power source
and see that the process selection
works ok (I-line)
Check the intermediate cable
between wf-unit and power source
and see that the process selection
works ok (I-line)
Check the signals on control card
A001´s connector X7
If the signals on control card A001
connector X7 are ok, then replace
the control card A002
See, if there is a resistor R188
mounted onto the control card
A001. If one is found, remove it.
Measure the supply voltage.
Overvoltage watch stops welding if
supply voltage rises above 520 Vac.
Check the rectifier unit VG102
wiring and if the unit is damaged,
the DC-link voltage may
momentarily rise above +900 V,
which activates the watch circuit.
Check the intermediate cable
between power source and wf-unit
Check the auxiliary transformer and
make sure 18 Vac is taken to power
source´s control card connectors
X15/1 and X15/2
Check wf-unit control card A001
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