Fault Tracing - ESAB Caddy Mig C200i Service Manual

There are tongue--and--groove joints in the upper part of housing. To avoid damaging of the
joint and achieve good connection, it is strongly recommended to follow the bolts insertion
sequence presented on the drawing.

Fault tracing

Type of fault
Machine is dead.
LED is off (display is off).
Fan is not working.
The machine is dead.
LED is off (display is off).
Fan is not working.
Mains fuse tripped.
No wire feeding.
Fan is working.
LED (or display) is on.
The equipement seems to
work properly, however the
welding seems to be imposs-
ible.
No shielding gas.
The equipement seems to
work, but it is permanently
blocked by some error.
The yellow diode is on (the
display shows error).
s1Cad200
Check that the mains power supply switch is turned on.
S
S Check that the welding current supply and return cables
are correctly connected.
Check that correct current value is set.
S
General failure in the power block.
S Check the power PCB according to the description on
the next page.
Replace damaged parts.
S
NOTE! Insufficient check may cause another failure of the
new part.
S Check torch switch circuit.
Check lack of the indicated failure.
Press the torch pushbutton and check the open circuit
voltage.
If it is proper cca 58V, search failure in the control PCB.
S Check the open circuit voltage.
If it is significantly less then 58V, check the DC bus
voltage (390...400V). Search for the failure in the PFC
part.
S Check the gas supply.
Visually check the quality of the wire feeding.
S
Correct wire placement, roll etc.
Check gas connection.
S
S Check the gas valve operation by listening to the sound
of the tripping.
S Check the voltage on the solenoid. In the steady state it
should amount approx. 12V DC (average).
Note that any failure is latched, when the torch button is
S
on. Release it if pressed.
S Overheating should disappear after 3...4 minutes. Wait.
Switch the equipment off and switch on again after 2
S
minutes.
If it is still disabled -- look for failure in the control PCB.
S
Lack of any voltage may cause permanent disability.
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Edition 101222