gala gar GALA MIG 255 M Manuel Technique D'instructions page 23

5. ANOMALIES. PROBABLE CAUSES. POSSIBLE SOLUTIONS.
SYMPTOM. ANOMALY.
GENERAL PROBLEM
NOTHING WORKS.
LIMITER TRIPS
ALTHOUGH THE MACHINE IS
CONNECTED AND WITH THE
SWITCH ON, THERE IS NO
REACTION WHEN PRESSED
WHEN THE GUN IS PRESSED,
ALTHOUGH WIRE COMES OUT,
THE CONTACTOR DOES NOT
WORK OR/AND THERE IS NO
SHIELDING GAS.
WHEN THE SHIELDING GAS IS
RELEASED IT CONTINUES
FLOWING.
WHEN FINISHING WELDING
THE WIRE REMAINS STUCK TO
THE TORCH CONTACT TUBE.
WHEN FINISHING WELDING
THE FINAL WIRE LENGTH IS
VERY GREAT.
THE EQUIPMENT DOES NOT
WELD CORRECT.
"IT ADJUSTS BADLY"
THERE ARE MANY
PROJECTIONS IN THE WELDING
PROCESS
SPECIALIZED PERSONNEL MUST CARRY OUT ANY WORK ON THE EQUIPMENT.
BOTH AT THE BEGINNING AND END OF A REPAIR CHECK THE EQUIPMENT INSULATION LEVELS.
(DISCONNECT THE ELECTRONIC CARDS WHEN MEASURING THE INSULATION).
The insulation-measuring device will have 500 V DC and will be applied to the following points of the circuit:
- Intake rectifier-Earth: Ra> 50 Mohms
- Outlet rectifier-Earth: Ra> 50 Mohms
- Switch l2 - Outlet rectifier: Ra> 50 Mohms
- Control circuit-Earth: Ra> 50 Mohms
In the event that lack of insulation is observed it is likely that this is due to the accumulation of metal dust on the
inside of the equipment.
BOTH AT THE BEGINNING AND END OF A REPAIR, BLOW THE INSIDE OF THE EQUIPMENT WITH
GALA MIG 255 M. Technical Instructions Manual
PROBABLE CAUSE.
The machine has no voltage in one or all its
vital elements.
Magnetothermal switch has low gauge for the
case. There may be a short circuit, which is
what causes the limiter to trip.
Problem in internal connection.
The thermal protection has "blown". Pilot F
illuminated.
Faulty electronic card.
Failure of the pistol switch which does not
make perfect contact.
Voltage does not reach the Contactor or/and
solenoid valve.
There is impurity in the inside chamber of the
solenoid valve which prevents the piston from
closing completely.
The contactor has a very high opening delay.
The contactor has a very low opening delay.
Low effective welding voltage. Output wave not
correct.
The welding wire has a mechanical resistance
at the outlet, which prevents it from having a
regular speed.
Unsuitable shielding gas.
Ra: Insulation resistance in Mohms.
COMPRESSED AIR.
POSSIBLE SOLUTION.
1. Make sure there is voltage at the entry to the
machine, if not the tapping must be changed. It is
advisable to see if any magnetothermal has "blown".
2. Check that fuse (E) of the power source is not
open.
3. The machine panels must be removed testing the
logical points of the electrical diagram.
Change the magnetothermal for another larger
gauge one. It is important for the magnetothermal
switch to have a characteristic slow type curve. It is
important for the magnetothermal switch to have a
characteristic slow type curve. In the event that the
electrical installation has limited power the welding
work must be tested at lower current levels.
Check that the internal electrical connections are
corrects.
Wait until the machine cools down correctly. Do not
disconnect the machine.
Replace the electronic card.
Change the gun microswitch.
It must be established whether the fault comes from
the electronic board or if it is an electrical connection
fault.
Check that the contactor coils or/and solenoid valve
are not open.
Dismantle and clean the electrovalve.
Suitably regulate the Burn-Back potentiometer of the
electronic card.
Suitably regulate the Burn-Back potentiometer of the
electronic card.
Check that there is not a phase failure in the supply
power.
Check that the electrical contact elements of the
welding circuit are correct: Welding mass, rusty or
very dirty surfaces, contact nozzle with greater
diameter than the wire, etc.
Test the electrical diagram of the power source: input
and output voltages to the rectifier.
Examine the welding gun. Blow the inside (cable)
with compressed air.
When welding normal steels we advise the use of a
gas mixture Ar-CO2.
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