L-TEC PCM-70 - Optional Accessories; Installation; Primary Input Electrical Connection; Inspection and Placement

C. OPTIONAL ACCESSORIES
1. Drag Type Shield Guard, P/N 19989 (PT-17A) —
Protects the heat shield and permits the operator to drag
a manual torch on the plate while cutting. Thus main-
taining a fixed stand-off (tip-to-work distance)
throughout the cut resulting in a uniform appearance of
the cut edge. Two drag type guards are supplied with
each spare parts kit.
2. Standard Shield Guard, P/N 19990 (non drag type)
(PT-17A) — Protects the shield against accidental
breakage on both manual and mechanized torches. One
standard guard is supplied with each spare parts kit.
3. Drag Type Heat Shield, P/N 999620 (PT-121) —
Slightly longer than a standard heat shield and slotted
permitting the operator to drag a manual torch along
the plate during a cut. This maintains a fixed standoff
(tip-to-work distance) throughout the cut providing a
uniform appearance of the cut plate edge.
4. Circle Cutting Attachment, P/N 19897 (PT-17A);
P/N 999696 (PT-121) — Permits cutting accurate
circles from 4-1/2-in. to 22-in. in diameter with a manual
torch. The attachment includes a head and radius bar
assembly, center-point/adaptor, and dual swivel castor
assembly. Cuts can be made inside or outside the circle.
The torch head is always held vertical during the cutting
operation. An accessory extension bar (P/N 163223) is
also available for cutting larger circles up to 44-in. in
diameter. The attachment is also handy for maintaining
` a constant standoff in other types of cutting.
5. Plasma Gas Flow Measuring Kit, P/N 19765 — This
kit is used for checking gas flows through torch. See
Section VI-B.
IV. INSTALLATION
Proper installation can contribute materially to satisfac-
tory and trouble-free operation of the cutting outfit. It is
suggested that each step in this section be studied carefully
and followed as closely as possible.
A. INSPECTION AND PLACEMENT
1. Having removed the shipping container, and before
removing the skid, inspect for evidence of concealed
damage which may not have been apparent upon receipt
of the unit. Notify the carrier of any defects or damage
at once.
2. Check the container for any loose parts. Check air pas-
sages on rear panel of cabinet for any packing materials
that may obstruct air flow through the power supply.
3. On PCM-70/PT-121 packages, mount the components of
the TR- 21SP truck and cylinder kit (680793) as directed
by F-14-414 packed with the kit.
4. The machine components are maintained at proper
operating temperatures by forced air which is drawn
through the front panel louvers and holes in the base
and out the rear panel by a heavy-duty fan. Locate the
machine in an open area where air can circulate freely
through the openings. Leave at least two feet of
clearance between the unit and wall or other obstruc-
tion. The area around the unit should be relatively free
of dust, fumes and excessive heat.
B. PRIMARY INPUT ELECTRICAL CONNECTION
WARNING
Precautionary measures should be taken to provide max-
imum protection against electrical shock. Be sure that all
power is off by opening the line (wall) disconnect switch
and unplug the power cord to the unit when primary
electrical connections are made to the power supply.
1. A line (wall) disconnect switch, with fuse or circuit
breakers, should be provided at the main power panel.
The primary power leads should be insulated copper
conductors, and include three power leads (two if using
single-phase) and one ground wire. The wires may be
heavy rubber covered cable, or may be run in a solid or
flexible conduit. Refer to Table 6 for recommended input
conductors and line fuse sizes.
Table 6 - Recommended Sizes
for Input Conductors and Line Fuses
Rated Input Input & Gnd.| Fuse
— Conductors | Size
Volts | Phase | Amps CU/AWG Amps
230 3 38 8 60
460 3 19 12 30
|208 |1 54 EI 6 80
230 1 48 6 70
460 1 24 10 40
sx: Sized per National Electric Code for 75° C rated conductors @ 30° C am-
bient. Not more than three conductors in raceway or cable. Local codes
should be followed if they specify sizes other than those listed above.
2. As shipped, the PCC-70 is set up for 460 volt, 60 hertz
input. If using 230 or 208 volt input, the links on the
terminal board ( TB) and jumper on terminal block (T1)
inside the unit must be repositioned (see Fig. 2). To gain
access to the terminal board, remove access door on right
side panel.
3. Thread the input conductor cable from the wall discon-
nect switch through the (strain relief) hole in the rear
panel to the input terminal board. Connect the primary
power leads to terminals L1, L2, and L3 (if using 3-
phase; if single phase, connect leads to L1 and L2) and
the green ground wire to GND terminal on the terminal
board using UL listed pressure wire connectors. Secure
the input cable by tightening the strain relief coupling.
CAUTION: It is of the utmost importance that the chassis
be connected to an approved electrical ground
to prevent accidental shocking. Take care not to
connect the ground wire to any of the primary
leads.