Tweco Ultima 150 - Manual (Page 22)

SECTION 3: INSTALLATION 16 Manual 0-2472
3.06 Work Cable Connection
High frequency pilot arc initiation generates a certain
amount of electromagnetic interference (EMI), commonly
called RF noise. This RF may interfere with other elec-
tronic equipment such as CNC controllers, etc. The sys-
tem is designed with shielded torch leads to help prevent
this problem. To further minimize RF interference, make
sure the work cable is properly connected when installing
mechanized systems.
1. Make sure the work cable is securely fastened to
the WORK connection on the rear panel of unit.
2. Make a solid connection between the work cable
and the work piece or welding machine.
Work Cable Connection
A-00818
Figure 3-6 Rear Panel Work Cable Connection
WARNING
Make sure the ground wire is designated GND on
the other end of the cable. Electric shock and dam-
age to the unit could occur if power is applied to the
GND terminal.
3.07 Plasma and Shield Gas
Connections
The ULTIMA-150 power supply comes with two 10' gas
supply hoses. Plasma and shield gases are connected at
the rear of the ULTIMA-150 power supply unit.
NOTE
It is not recommended to supply both plasma and
shield gas from one (1) regulator via "Y" connec-
tions. It is an additional source for leaks and flow
rates of the gases can be impacted when one is
changed.
1. Connect the Plasma (black or no tape) and Shield
(yellow tape) gas supply hoses from the rear of the
unit to the gas supply regulators.
2. Set pressure regulators on gas cylinders at 35 psi.
Plasma and Shield
Gas Connections
A-00819
Figure 3-7 Gas Connections
3. Plasma gas flows when the main power circuit
breaker is turned on. Gas flow rates are controlled
by the Plasma and Shield gas flow meters located
on the front panel. Gas flow rates typical for most
applications are:
Plasma Gas: 1 - 1.5 scfh
Shield Gas: 15-20 scfh
4. Shield gas can be selected to operate ON or OFF
when the pilot arc is off. For Shield gas ON, jumper
across TB1 pins 17 to 18.