tecn@ SALDATRICI ART. 3401 - 3406 - 3407 - 3408 WELDERS ITEM 3401 - 3406 - 3407 - 3408
Documento numero / Document number: MAN1063 Edizione / Edition: Settembre / September 1997 PAG. 22 / 32
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 eventually replace it.
Faulty control unit. Replace it.
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 connectors or cables disconnected. Check.
The start of cycle microswitch placed on the
foot-control does not work properly.
Check and eventually replace it.
Faulty control unit. Replace it.
The welder does not carry out the MODE selector set to NO WELD. Set to TIMER.
welding. Control unit START led light
by pressing foot-control. The
CURRENT light is off during all the
Protection thermostat activated. The control
unit THERMOSTAT led lights.
Check that water circulates in the
required quantity. Check for a too high
working rate.
welding cycle. Faulty control unit. Replace it.
The welder unit carries out the welding
cycle without current circulation. The
control unit CURRENT led lights.
Faulty contact in the secondary circuit Check and tighten all the secondary
connections. Do not forget the electrode
and electrode-holder connection.
Faulty control unit. Replace it.
During the welding process, the
machine stops without ending the
welding time.
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.
Spots or electrodes overheating. Insufficient 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. Insufficient 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. Insufficient 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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