Welding Gun Connections; Shielding Gas Installation - Miller Electric S-21E Technical Manual

5. For 50 Series style one-piece drive rolls:
a. Slide drive roll onto drive roll mounting hub.
b. Align drive roll with holes.
c. Insert securing screws, and tighten.
6. For 50 Series style split drive rolls:
a. Align holes on pair of split drive rolls.
b. Insert securing screw.
c. Slide drive rolls onto drive roll mounting hub.
d. Align drive rolls with holes.
e. Insert securing screws, and tighten.
Horizontal alignment of the drive roll on
IMPORTANT:
the drive roll mounting hub with the wireguide is factory
set andshould not require readjustment. If readjustment
becomes necessary, see Section
7. Close and secure left case access door.
4-3. WELDING GUN CONNECTIONS (Figures 4-1
And 5-1)
A WARNING: ELECTRIC SHOCK can kill.
• Do not touch live electricalparts.
• Shut down wire feeder and welding power
source, and disconnect input power employ-
ing lockout/tagging procedures before work-
ing on feeder.
Lockout/tagging procedures forwire feeder con-
sist of disconnecting interconnecting cord, and
for welding power source consist of padlocking
line disconnect switch in open position, remov-
ing fuses from fuse box, or shutting off and red-
tagging circuit breaker or other disconnecting
device. Stop engine, and disconnect negative
(—)
battery cable from battery on welding gen-
erators.
A hole isprovided in the nameplate form-
IMPORTANT:
stallation of a gun requiring an opening for an external
gas line. Remove snap-in blank before installation.
A. Gun Connector To Drive Assembly (Figure 4-1)
1. Unlatch and open left case access door.
2. Loosen gun/feeder connector securing knob on
the wire drive housing.
3. Insert gun/feeder connector through the access
hole in the front panel.
4. Insert gun/feeder connector into drive housing
with the outlet wire guide as close to the drive rolls
as possible without touching, and tighten the se-
curing knob.
Close and secure left case access door.
5.
S-21E
10-2.
B. Gun Trigger (Figure 5-1)
TRIGGER
RECEPTACLE
Connect gun trigger plug to trigger receptacle on the
front panel as follows: align keyways, insert gun plug
into trigger receptacle, and rotate threaded collar fully
clockwise.
4-4. SHIELDING GAS INSTALLATION (Figures
4-2 And 4-3)
A
WARNING: PRESSURIZED CYLINDERS can
rupture causing serious personal injury and
loss of life; FALLING CYLINDERS can cause
serious injury and equipment damage.
• Keep cylinders away from welding or other
electrical circuits.
• Neverallow a welding electrode to touch any
cylinder.
• Always fasten cylinder securely to running
gear bracket, a wall, or other stationary sup-
port.
A. Gas Cylinder (Customer Supplied)
Chain the cylinder to a wall or other stationary support to
prevent the cylinder from falling over and breaking off
the valve. If optional power source running gear is used,
secure gas cylinderto running gear with supplied chain.
B. Regulator/Flowmeter (Customer Supplied)
1. With the cylinder securely installed, remove the
cylinder cap, stand to one side of cylinder valve,
and open valve slightly. When gas flows from cyl-
inder, close valve. This procedure blows out dust
or dirt that may have accumulated around the
valve seat.
A gasket should be installed to prevent
IMPORTANT:
leaks. Do not use lubricants or sealing agents.
2. The regulator/flowmeter must be properly
equipped with a stem, nut connectors, and gas-
ket for use with either CO 2 cylinders or inert gas
type cylinders.
3. Install gas regulator/flowmeter onto gas cylinder
valve; keep the face of the regulator/flowmeter
gauge in vertical position, and tighten stem nut
securely to gas cylinder valve.
4. A shielding gas fitting is provided on the rear of
the wire feeder. Obtain a suitable hose with
5/8-18 right- hand fitting. Attach one end of the
gas hose to this fitting. Attach the other end of the
gas hose to the regulator/flowmeter.
'9=
TM-1571 Page 5