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CEBORA S.p.A.
3.4 - Error codes.
3.4.1 - E1 - Transformer (31) temperature above limits.
The power source delivers no current, but the fan continues running; we therefore recommend
leaving the power source powered to ensure rapid cooling.
This is reset automatically when the temperature returns within the allowed limits.
The thermostat is inserted on the windings of the transformer (31); its contact must be closed
at ambient temperature.
If the alarm persists even with the power source powered and without welding, check the
voltages on the windings of the transformer (31), performing the SERVICES POWER SUPPLY
TEST in par. 3.3.1.. If the alarm occurs only when welding, make sure that the working cycle is
not above specifications, or that the ambient temperature is not too high.
3.4.2 - E2 - Scr (3) short-circuited.
To allow the clamps, gun and rivet to be positioned, the output terminals (F) and (G) of the
power source must be free from voltage until the moment of welding. In the event the scr (3) is
short-circuited, there would be voltage on the output terminals (F) and (G), and this positioning
would be difficult and hazardous. This check therefore makes sure there is no voltage on the
output terminals (F) and (G); otherwise it blocks the unit and activates E2.
Check the wiring between cathode and gate of scr (3) and terminals 1 and 2 of CN2, power
board (12). With CN2 disconnected from power board (12) measure the resistance between the
anode and cathode of scr (3). Correct value = >Mohm in both measurement directions. If
incorrect, replace scr (3).
3.4.3 - E3 - Dc voltage on the DC-capacitors (24) irregular.
The dc voltage on the DC-capacitors (24) has risen beyond the maximum allowed limits.
This may be due to a defect in the regulating circuits or a short-circuit of the triac TR1 on
power board (12). This alarm also trips the relay RL2 on power board (12), which cuts off the
power circuit (190 Vac secondary circuit of transformer (31)), to avoid the risk of explosion in
the DC-capacitors (24).
To reset, shut off and restart the power source after removing the cause of the block.
Make sure that the triac TR1 on power board (12) is not short-circuited. Replace if necessary.
Replace the power (12) and/or control (2) boards.
3.4.4 - E4 - DC-capacitor (24) irregular charge.
Irregular (too slow) charge of the DC-capacitors (24). In this case the voltage regulator circuit
is no longer deemed efficient. This control thus blocks the power source to avoid welding with
potentially hazardous voltages.
To reset, shut off and restart the power source after removing the cause of the block.
Replace the power (12) and/or control (2) boards.
3.4.5 - E5 - DC-capacitors (24) irregular discharge.
To lower the voltage on the DC-capacitors (24), the check engages the discharge resistor (7)
in parallel to them until the programmed voltage is reached. If this circuit does not work or if the
discharge resistor (7) is interrupted, this control blocks the power source.
Check resistor (7), making sure whether on CN2 of power board (12), terminals 5 and 6,
resistance = approximately 60 ohm. If >Mohm (circuit broken) replace discharge resistor (7). If 0
ohm (short-circuit) replace discharge resistor (7) and power board (12).
Replace the control board (2).
3.302.311
15
23/01/2015
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