Simultaneously with switch-on of the yellow led, it indicates an alarm status via blinking codes (in this status only the two power
supply and alarm leds are on):
* N.B.: to perform a MASTER RESET, see procedure in following section 8.
Normally, when cause(s) of alarm(s) is(are) removed, press one of the keys to exit from alarm status (or switch off and on the machi-
ne): machine will execute a new autotest and then start as in normal operation.
In case of error code E00, see also next section 7.2 "Internal diagnostic indicators": this could help to recognize specific cause of
instantaneous alarm.
In the case of error E10, check the power supply voltages on the input filter board 15.14.269 (see also following section 7.2 "Internal
diagnostic indications"), with reference to the following table:
In the case of error E11: check the state of the pressure switch inside the cooling unit WU21 (see wiring diagram in previous sec.
5.3). When the water pump is off, the contact is normally closed, whereas with the pump operating, + 5Vdc should be measured
between terminals 1 & 2 of the pressure switch.
To exclude the pressure switch, simply disconnect one of the terminals (e.g. wire n° 74).
Caution: the delay in de-activating the water pump can be set via setup parameter 16 (see following sec. 8).
In the case of error E12 or E13, check the state of the thermal protection devices in the following section 7.3 "Arrangement of the
thermal protections".
In the case of actual overheating, cooling of the power source is optimised by leaving the machine on in TIG 2T with torch button
released (no-load voltage at output = 0Vdc).
When checking the ventilation, remember that the G302/382 controls the fan in order to minimise noise, energy consumption and
sucking in of dust from the outside: the fan is activated only when the power source internal temperature exceeds 42°C.
Blinking of "Power at output" led
If the "Power at output" led blinks in MMA mode, perform the following checks:
- output voltage too low:
may be due to a short circuit outside (welding clamps, torch, welding cables) or inside the power source (secondary rectifier,
secondary inverter, overimposition board);
- output voltage on load too high (does not happen loadless):
could be due to incorrect use of any static load (excess resistive value, see also sec. 3.3).
Indicat.
E00
E10
E11
E12
E13
E19
E20
E24
E25
E26
E27
Description of diagnostic indications 31
Type of error
General error due to a temporary
fault in the power supply or in the
output current
Mains alarm (overvoltage, under-
voltage, no phase)
No cooling fluid
Primary inverter stage overtempe-
rature
Secondary rectifier or AC stage
overtemperature
Welding circuit excess inductance
Control panel memory error
Action
See errors E10 & E19.
Check the power supply voltages 400Vac ± 15% on the board 15.14.269 (see follo-
wing sec. 7.2).
Check the cooling fluid level. Remove the WU21 side panel and check the state of
the pressure switch (N.C., see below).
Leave the power source to cool.
If the error persists: remove covers, check internal temperature, check fan, check pri-
mary thermal sensor (see following sec. 7.3).
Leave the power source to cool.
If the error persists: remove covers, check internal temperature, check fan, check
secondary thermal sensor (see following sec. 7.3).
Welding cables too long. If the piece to be welded has inductive characteristics (win-
dings etc.), move the earth clamp to minimise the overall circuit inductance.
Switch the machine off and then on again and perform a MASTER RESET*. If the error
persists, the machine operates but is no longer able to store the modified parameters
or recall the last welding configuration used: replace the control panel.
Under/Overvoltage alarm thresholds
Power supply rated voltage
3x400 V (50-60Hz)
Undervoltage
340V
Overvoltage
460V
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