Tweco PAK 200i - Manual (Page 122)

PAK 200i
A-42 APPENDIX Manual 0-5335
Art # 12300
Art # 12301
The AC Suppression PCB has capacitors and other transient suppression components to protect the system from
transients on the AC lines. It also provides power for the neon AC present indicators which illuminate when AC
power is connected even with ON-OFF switch, CB1, off.
Differences between various models.
Auto-Cut 200 , 300 XT and Pak 200 XT units use the basic gas control/arc start circuits consisting of single gas inlets,
one for Plasma, one for Gas Shield and one for water inlet, optional for AC �00 XT, for H�O Mist shield (not offered
on Pak 200 XT). There is a pressure regulator and gauge for each gas inlet and water flow meter/control when the
H2O Mist option is used. All 3 are turned on/off with control solenoids. Changing gas types requires connecting
different gasses to the rear panel and setting the gas switch on the rear panel to match the plasma gas type. There
is no separate pilot (Preflow) gas at this time.
The Auto-Cut and Pak XT Arc starter is the conventional spark gap type with water cooled coil that we’ve used
for several years. This arc starter injects the HF onto the torch electrode via the negative lead with the return via
the tip and pilot lead. The Ultra-Cut XT units use the remote arc starter, RAS 1000 XT. In place of the spark gap the
RAS 1000 XT uses a solid state ignition module to create the HF pulses which are injected onto the tip and return
via the electrode, the opposite direction of that used in the Auto-Cut, Auto-Cut XT and the older RAS 1000 used
with the Ultra-Cut units.