42- "Motor Fault" On Display A. Motor (12) Encoder Sig- Nal Error; 53- "Release Start Button" On Display A. Start Button; Pressed At Start-Up Or While Resetting From Stop Due To Overtemperature; 54- "Current Not 0" On Display A. Short-Circuit Between Torch And Workpiece Upon Start-Up - Cebora 305 Manual De Servicio

3.3.5 -42- "Motor fault" on display A. Motor (12) en-
coder signal error.
The signal provided by the encoder built into the motor
(12) 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 (19) and thus the motor (12) speed is out
of control.
Perform the "wire feeder motor operation" tests in par.
3.2.6.
3.3.6 -53- "Release start button" on display A. Start
button pressed at start-up or while reset-
ting from stop due to overtemperature.
The high temperature alarms stop the power source, with
a message on the control panel of the corresponding alarm
(see error 74 and 77).
These alarms automatically reset when the temperature is
EN
again within the allowed limits.
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 A.
To restore proper operation, remove the start command
(see par. 3.2.4).
3.3.7 -54- "Current not 0" on display A. 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 (34) and polarity reverser.
Check the wiring between VITE1 and VITE2 terminals, po-
larity reverser and power source C and D output terminals.
28

3.3.8 -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 interval.
"Error 56" indicates that the short-circuit has exceeded
this limit.
This situation may be caused by a short-circuit created
between the electrode and gas nozzle on the torch due to
deposits of dirt or metal dust.
In addition to cleaning the torch perform the the "open
circuit operation" tests in par. 3.2.7 and the "operation on
resistive load" tests in par. 3.2.8, if necessary.
If you find defective connections, fix and replace any
damaged components.
3.3.9 -57- "Motor current high" on display A. Exces-
sive wire feeder motor (12) current.
The panel board (19) is equipped with a supply current
limiting circuit for motor (12), to protect it over any
overload and a circuit that detects when the limiter is
continuously tripped, indicating a permanent overload.
This overload is primarily due to mechanical causes, such
as dirt in the gears of the gear-motor, friction from a lack
of lubrication, impediments in feeding the wire coil, bot-
tlenecks in the torch sheath along the torch cable, etc.
Therefore, clean the wire feed unit and check whether the
problem continues to occur if operating without the wire
feeding.
If so, you may hypothesize that the motor winding or me-
chanical reducer built into the motor have deteriorated and
thus replace the motor (12).
If necessary, perform the "wire feeder motor operation"
tests in par. 3.2.6.
3302327/A