ESAB AristoMig U400, Instruction Manual, Page: 11 / 20

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7.2 Topping up the coolant
We recommend a 50/50 % mixture of water and ethylene
glycol.
Top up with coolant until it is up to the level of the filling hole.
8 FAULT TRACING
Try these recommended checks and inspections before sending for an authorised
service technician.
Type of fault Action
No arc.
S
Check that the mains power supply switch is
turned on.
S
Check that the welding current supply and
return cables are correctly connected.
S
Check that the correct current value is set.
S
Check to see whether the fuse has tripped.
Welding current is interrupted during welding
S
Check whether the thermal overload trips
have operated (indicated by the orange
lamp on the front panel).
S
Check the main power supply fuses.
The thermal overload trips operate frequently.
S
Check to see whether the air filters are
clogged.
S
Make sure that you are not exceeding the
rated data for the power source (i.e. that the
unit is not being overloaded).
Poor welding performance.
S
Check that the welding current supply and
return cables are correctly connected.
S
Check that the correct current value is set.
S
Check that the correct electrodes are being
used.
S
Check the main power supply fuses.
9 ORDERING OF SPARE PARTS
AristoMig U400 is designed and tested in accordance with the international an Europe-
an standards IEC/EN 60974--1 and EN 50199.
It is the obligation of the service unit which has carried out the service or repair work
to make sure that the product still conforms to the said standard.
Repair and electrical work should be performed by an authorized ESAB serviceman.
Use only ESAB original spare and wear parts.
Spare parts may be ordered through your nearest ESAB dealer, see the last page of
this publication.
GB