Chapter 5. Anomalies. Probable Causes. Possible Solutions - GALAGAR GAR CUT 2500 Manual De Instrucciones

CHAPTER 5. ANOMALIES. PROBABLE CAUSES. POSSIBLE SOLUTIONS.

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