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3.4.5 -14- "Undervoltage" on display (1). Inverter
igbt driver supply voltage error on power
board (56).
Perform the CONTROL POWER SUPPLY TEST, in par.
3.3.1, paying special attention to the 15 Vdc and 5 Vdc
voltages.
Make sure the presence of the three phases of the mains
voltage (see note to par. 3.4.14, error 61).
3.4.6
-25- INV board on power board (56) EPLD bus
malfunction.
This code calls up various problems that may occur in
controlling the igbt inverter.
Generally they are those defects that cause a high absorbed
current in the primary circuit of the (57) power transform-
er, due for example to a short-circuit in the windings of the
(57) transformer or in the secondary diodes group.
For an analysis of the problem, see "open circuit opera-
tion", par. 3.3.8 and "operation on resistive load", par. 3.3.9.
3.4.7
-30- Minimum current threshold incorrect set-
ting.
MINIMUM CURRENT THRESHOLD SETTING.
□ Power board (56), connectors J7-B(-) e J13-2(+) = +360
mVdc, +/- 10 mVdc with power source powered but not
delivering current.
YES
Correct?
♦ With power source off, temporarily discon-
nect J10 from power board (56) and check the
resistance on terminals J7-B e J12-2 on pow-
er board (56). Corrected value = 22,0 ohm. If
incorrect, replace power board (56).
♦ Adjust trimmer TR1 on INV board on power
board (56) to have 360 mVdc +/- 10 mV.
♦ Replace the power board (56) and/or current
transducer (59).
■ Regular setting, replace power board (56).
3.4.8
-42- "Motor fault" on display (1) A. Motor en-
coder signal error (11).
The signal provided by the encoder built into the motor (11)
is used as a speed feedback signal to adjust the motor speed.
"Error 42" indicates that the signal provided by the en-
coder is not suited to the reference signal generated by the
panel board (47) and thus the motor (11) speed is out of
control. Perform the "wire feeder motor operation" tests
in par. 3.3.7.
3302339/A
NO
3.4.9
-53- "Release start button" on display (1). Start
button pressed at start-up or while reset-
ting from stop due to temperature beyond
limits or carter opened.
The temperature beyond limits and the wire feed unit
guard open alarms stop the power source, with a message
on the control panel of the corresponding alarm.
These alarms automatically reset when the temperature is
again within the allowed limits or the guard is closed.
It may occur that the unit resets when the start command
is present; therefore, to prevent the power source from
starting suddenly due to a random reset, this situation is
detected and causes a power source block, with the mes-
sage "Release start button" on display (1).
To restore proper operation, remove the start command
(see par. 3.3.4).
3.4.10 -54- "Current not 0" on display (1). Short-cir-
cuit between torch and workpiece upon
start-up.
Upon power source start-up the control checks the
operating conditions by performing a brief test to generate
the open-circuit output voltage.
While this is taking place it is important that the torch not
touch the workpiece or welding bench.
The following conditions may be detected during this test:
− output voltage present and output current present =
error 54;
− output voltage present and output current absent =
correct operation;
− output voltage absent and output current present =
error 54;
− output voltage absent and output current absent =
error 10.
Error 54 indicates a possible short-circuit or isolation leak
in the power circuit at the output of the secondary diodes
group on power board (56).
Check wiring between PRIM_A and PRIM_B terminals
(primary power transformer (57)) and VAC1, VAC2 and +
SEC (power transformer secondary (57)) of power board
(56) and output terminals (3) and (4) of power source.
If defective connections are found, fix and replace any
damaged components.
3.4.11 -56- Short-circuit at the output lasts too long.
It is normal to detect short-circuits at the output during
welding, as long as they do not last beyond a given inter-
val.
"Error 56" indicates that the short-circuit has exceeded
this limit.
This situation may be caused by a short-circuit created be-
tween the contact tip and gas nozzle on the MIG torch due
EN
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