Trouble Shooting - ABB GWT C9 Product Manual

4.3 Trouble shooting

Trouble shooting chart
Trouble
Shunt or transformer
over temperature
Welding current is too
low
Welding current is too
high
Electrode caps has
abnormal wear or
weld spot is bent
Stuck spot weld
Product manual - GWT C9
3HAA010198-001 Revision: A
Possible cause
Screws are loose
Water cooling flow
rate is too low
Secondary current
overload
Primary voltage too
low
No, or bad, feedback
from the current
sensor
Some screws are
loose
No, or bad, feedback
from the current
sensor
Electrode cap are not
perpendicular to the
workpiece
Electrode cap mis-
alignment
Worn electrode caps
Workpieces are dirty
Welding current is too
low
Welding force too
high
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4 Maintenance
4.3 Trouble shooting
Action Further information
Verify that shunts and See
contact surfaces are tightening torques on
not damaged. Re- page
place the part if it is
See
necessary and/or
the leaf shunts on
tighten the screws
page
with a torque wrench.
Inspect the cooling See
circuit. page
Verify that the actual
permanent current is
lower than the rated
current expected.
Verify the voltage of
the welding power
supply.
Verify that its resist-
ance is about 30 Ohm.
Inspect the wiring.
Tighten the screws See
with a torque wrench. tightening torques on
page
Verify that its resist-
ance is about 30 Ohm.
Inspect the wiring.
Verify/modify the ro-
bot target.
Perform a correct
alignment of the elec-
trode caps.
If necessary, verify
TCP.
Dress/change the
electrode caps.
Clean the workpieces.
See Welding current
is too low. above
Perform a force calib- See Application
ration. manual - Spot options
3HAC050979-001.
Continues on next page
Bolt, screws,
118.
Replacement of
87.
Water cooling on
28.
Bolt, screws,
118.
73