GAR CUT (V. INDUSTRIAL). Instructions Manual
24
CHAPTER 5. ANOMALIES. PROBABLE CAUSES. POSSIBLE SOLUTIONS.
SYMPTOM. ANOMALY.
PROBABLE CAUSE.
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 the FA-001 plate fuses.
The machine has no voltage in one or all its
vital elements.
3. The machine panels must be removed testing the
logical points of the electrical diagram.
Although the high frequency generating plate
(GHF-1) is excited the arc does not ignite.
Replace high frequency generating plate.
GENERAL PROBLEM.
NOTHING WORKS
.
There is not a correct no-load voltage of 270
V.
Check rectifier, contactor, main transformer and
switches.
LIMITER TRIPS
Magnetothermal switch has low gauge for the
case (if it is the main one the installation may
have an installed power of under 25 kw
minimum). There may be a short circuit, which
is what causes the limiter to trip.
Change the magnetothermal for another larger
gauge one. 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 cutting work must be tested at lower current
levels.
Low air pressure. Machine not operative. Red
light on.
Increase the intake pressure by means of pressure
reducing valve situated on the rear of the apparatus.
Transformer overheated. Machine not
operative.
Amber light on. Wait until the machine cools down.
Failure in the torch safety system. The nozzle-
holder of the pistol may not be perfectly
tightened.
Secure safety cap of the torch.
Screw in the nozzle-holder well.
Failure of the pistol switch which does not
make perfect contact.
Change torch microswitch.
ALTHOUGH THE MACHINE IS
CONNECTED AND WITH LIGHT
C ON, THERE IS NO REACTION
WHEN PRESSED
Main electronic plate SCP-2 faulty.
Replace electronic plate SCP-2
Air pressure set at a high value.
Decrease it to a value of 5.5 bar with pressure
reducing valve R.
New electrode with insulating surface layer.
Brush electrode. "Polish the electrode".
Slag on flat part of the nozzle.
Clean the nozzle properly.
The preflow cycle is not completed as the
pushbutton is released quickly.
Keep the pushbutton pressed for more than one
second.
Excessive wear of the electrode.
Replace the electrode.
Nozzle diameter very big, either due to wear
or it is a new nozzle 1.8 mm in diameter.
Replace nozzle.
Low quality electrode or nozzle.
Use original spares.
The high frequency electronic plate GHF is not
excited with 230 V in ignition phase.
Replace
electronic
control
plate.
Supervise
connections and wiring.
WHEN PRESSED, EVEN
THOUGH AIR COMES OUT, THE
ARC DOES NOT IGNITE OR THE
ARC "BACKFIRES".
The breakdown of the central control plate is
reiterative.
Check the degree of insulation of the equipment.
Blow the inside with compressed air.
A lower cutting power has been selected.
Increase the cutting power with potentiometer P1.
The part is very thick.
The cutting speed acquired is very high.
Decrease cutting speed.
Consumable elements worn.
Replace electrode and/or nozzle.
Low voltage in the installation.
Check with electricity company.
Bad contact of the electric earth.
Make good contact of earth.
THERE IS NO PENETRATION IN
THE CUT.
Air flow incorrect.
Observe if the pressure with the air flowing is 5.5
bar. Blow the inside of the cutting torch. Clean the
electrovalves.
There is an impurity in one of the electrovalves
which prevents the piston closing the air flow.
Dismantle and clean the electrovalve.
THE AIR FLOWS ALL THE TIME.
THERE IS NO PNEUMATIC
DISCONNECTION.
Electronic control plate SCP-2 is faulty.
Replace electronic plate SCP-2.
