Model SG-100 Plasma Spray Gun
Operator’s Manual
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Issued: 12/11
Page 28
Wear hearing protection.
Operation of a plasma gun generates strong noise emissions (> 130 dBa),
which can cause damage or loss of hearing.
3.4.1
Setup and pretest:
3.4.1.1
Mount the gun.
3.4.1.2
Connect the positive and negative water cooled cables to
the gun, making sure that they are connected to the
correct fittings of the gun in the proper polarity.
3.4.1.3
Connect the arc gas (argon) hose to the arc gas fitting at
the back of the gun, taking care to not over tighten the
fitting as this will cause the back insulator to crack.
3.4.1.4
Turn on the cooling water system and set the water flow
to give a minimum of 6 gpm (22.7 L/min).
3.4.1.5
Initiate the arc gas flow and set the regulator to give 60
psi (120 SCFH) [4.1 bar (56.6 L/min)].
3.4.1.6
Check for water leaks. Do not continue if leaks are
present.
3.4.2
Unit Test:
3.4.2.1
Energize the power supply.
3.4.2.2
Set for 700 amps/ max 750 amps.
3.4.2.3
Start the arc and inspect the plume to see if it is fluttering
or off center.
3.4.2.4
Allow the gun to run for 10 minutes.
3.4.2.5
Check that the amps are stable and that the system volts
are 30 V +/- 2 V, gun volts are 24 V +/- 2 V.
3.4.2.6
Press the arc start button again just before shutting off the
gun; this helps eliminate the hard starting of a new anode
on the second start.
Re-start the gun twice more to check for ease of starting.