SALDATRICI ART. 4640N
÷
4644N - WELDERS ITEM 4640N
÷
4644N
EDIZIONE/EDITION: GIUGNO/JUNE 2019
PAG. 23 / 40
Table 1 - Troubleshooting.
FAULT
CAUSE
REMEDY
The control unit does not switch on.
Inadequate or no mains voltage.
Check.
Control unit led ON keeps off.
Either connectors or cables disconnected.
Check.
Fuse FU1 blown.
Replace it.
Faulty main switch.
Check and, in case, replace it.
Faulty control unit.
Replace it.
The control unit does not switch on.
Inadequate mains voltage.
Check.
Control unit led ON is on.
Faulty control unit.
Replace it.
During the welding the machine stops
the welding current.
Too high voltage drop.
Check that, when working, voltage drop
is lower than 25%. On the contrary,
check that supply cables section is
adequate to their length.
The welder does not carry out the
welding. Control unit START led does
not light by pressing foot-control.
The foot-control does not activate the start
cycle micro-switch. Faulty set up of the force
adjusting screw.
Check.
Either disconnected connectors or cables.
Check.
Faulty micro-switch.
Replace it.
Faulty control-unit.
Replace it.
The welder does not carry out the
welding. Control unit START led lights
by pressing foot-control.
WELD/NO WELD function set to NO WELD. Set to WELD.
Control unit CURRENT led is off during
the welding cycle.
Faulty control unit.
Replace it.
The welder does not carry out the
welding. Control unit START led lights
by pressing foot-control.
Control unit CURRENT led lights
during the welding cycle.
Either SCR or firing module wrong
functioning. Firing modules led shows the
presence of the SCR trigger signals.
Find the faulty component and replace
it.
Faulty contact in the secondary circuit.
Check and tighten all the secondary
connections. Do not forget the electrode
and electrode-holder connection.
Spots or electrodes overheating.
Inadequate cooling.
Check that water circulates in the
required quantity and at a low
temperature.
Too high welding current or welding time.
Reduce them.
Electrodes reduced life.
Inadequate cooling.
Check that water circulates in the
required quantity and at a low
temperature.
Under-seized electrode in comparison with
the work to carry out.
Check both seize and contact diameter.
Secondary connections reduced life.
Inadequate cooling.
Check that water circulates in the
required quantity and at a low
temperature.
Heating caused by an inadequate clamping
of the flexible connection.
Carefully tighten the clamping screws.
Too high heating caused by a too high
welding rate.
Reduce it.
"
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