L-TEC PCM-70 - Secondary (Output) Connections

4. Recheck all connections to make sure that they are tight,
well insulated, and that the proper connection has been
made. Then reinstall the access door to right side panel.
CUSTOMER'S
FUSEDLINE
DISCONNECT
SWITCH
(See Table 6
for fuse size)
INPUT TERMINAL
BOARD (TB) -
See below
4 COND CABLE (32)
or 3 COND CABLE (1%)
(Customer Supplied - See Table 6)
JUMPER
DOUBLE
LINKS
(3 SETS)
TB (3-Phase Unit)
Fig. 2 - Input Power Cable Connection and Terminal
Board (TB)
C. SECONDARY (OUTPUT) CONNECTIONS
Before making any connections to the power supply out-
put terminals, make sure that all primary input power to
the machine is deenergized (off) at the main disconnect
switch.
1. Using PT-17A Torch (Refer to Fig. 3)
a. Connect the terminal lug end of the work cable as-
sembly to the WORK terminal in lower left corner of
front panel. Nut should be wrench-tight.
b. Lift front top cover to gain access to the torch connec-
tions.
c. Connect pilot arc adaptor P/N 19497 (supplied with
torch spare parts kit P/N 680784) to the POS output
fitting (note that threads are left- handed) and
tighten firmly with a wrench. Loosely place screw,
washer, and lockwasher in the most convenient
tapped hole in the adaptor.
. Thread the three torch service lines through the
bushing in the upper left corner of the front panel and
proceed as follows: (1) Connect the power cable (large
male nut with left hand threads) to the NEG output
fitting and tighten firmly with a wrench. (2) Connect
pilot arc cable to the adaptor assembled on POS
fitting at the most convenient tapped hole position of
adaptor. With washer and lockwasher in place,
tighten screw firmly with a screwdriver. (3) Connect
the 2-prong switch lead to the mating receptacle.
Make sure plug is firmly locked in place.
Close the top cover.
Assemble the filter-regulator (30338) to the upper left
corner on the rear panel (view from rear) as il-
lustrated. Mounting holes are provided. Hardware is
supplied with the mounting bracket.
. Connect the air hose assembly (678152) to filter-
regulator outlet fitting and to the “Plasma Gas-Air”
fitting on the rear panel of the PCC-70 unit. Note that
the air hose has left-hand threaded nut on one end
(regulator) and right-hand on the other.
. Connect your air supply to the inlet connection (1/4-
in. NPT female - customer to supply suitable end
fitting) of the filter-regulator.
Electrically connect work cable to work piece. The
connection must be made to a clean, exposed metal
surface free of paint, rust, mill scale, etc.
WARNING
A poor connection or failure to connect work cable to
work piace can result in fatal shock.
j.
Make sure workpiece is connected to an approved
earth ground. Use copper ground cable equal to or
larger than the power supply chassis ground listed in
Table 6.
2. Using PT-121 Torch (Refer to Fig. 4)
a.
Connect the terminal lug end of the work cable as-
sembly to the work terminal at the lower left corner
of front panel.
. Lift front top cover to gain access to torch connections.
Thread the three service lines (gas, power, and switch
lead) of the PT-121 torch through bushing in upper
left corner of front panel and connect them to the
matching fittings adjacent to the work terminal. Hose
connections should be wrench-tight. Make sure plug
of the switch lead is firmly locked in place. Then close
the top cover.
. Connect the gas supplies. The cylinders may be
placed and secured on the cylinder rack of the truck.
Before connecting the regulator(s), be sure to read,
understand, and follow all instructions packed with
each regulator.
Connect the gas hoses to the regulator(s) and to the
proper fittings on the rear panel of the PCC-70