14-Pin Plug Connection; Welding Wire Installation - Miller Electric S-21E Technical Manual

Flow
Adjustment
4-5. 14-PIN PLUG CONNECTION (Figures 4-3 And
4-4)
The 14-pin plug PLG1 00, on the end of the interconnect-
ing cord, provides a junction point for connecting the
wire feeder to a welding power source. This connection
provides 24 volt ac power, and contactor control when
used with a constant voltage (CV) power source with a
14-pin receptacle. To make connections, align keyway,
insert plug, and rotate threaded collar fully clockwise.
The pins on plug PLG 100 are defined in relation to both
the power source and wire feeder. The welding power
source provides six functions to the wire feeder. The
pins are designated as follows:
Pin A: Up to 10 amperes of 24 volts ac, 60 Hz, with re-
spect to socket G (circuit common); protected by fuse in
welding power source.
Pin B: 24 volts ac input power to energize the weld con-
tactor. The feeder sends back 24 volts ac by means of a
contact closure from pin A to pin B.
Pin G: 24 volts ac circuit common; also connected to
welding power source chassis.
The remaining pins in the receptacle are
IMPORTANT:
not used by the feeder.
Shielding Gas
valve Fitting,
14-Pin
Plug
Figure 4-3. Rear Panel View
TM-1571 Page 6
CO
2 Washer CO2 cylinder
CO2 Installation
Figure 4-2. Typical RegulatorlFlowmeter Installation
Wire Feed
Weld Cable
Connection
SA-125 924
Opening
Argon Installation
Figure 4-4. Front View Of 14-Pin Plug With Pin
Locations
4-6. WELDING WIRE INSTALLATION (Figure 4-5)
A
WARNING: ELECTRIC SHOCK can kill.
• Do not touch live electrical parts.
• 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
CAUTION: LOOSE WELDING WIRE can
cause Injury.
• Keep a firm hold on the wire during installa-
tion, removal, and threading operations.
Spooled wire has a tendency to unravel rapidly
when loosened from the spool.
If it should become necessaryto replace
IMPORTANT:
any part of the hub assembly see hub assembly rein-
stallation instruction in Section 10-3.
Gas cylinder
Valve
Argon or Argon
Mix cylinder
SB-109 492
Ref. S-0004
5-21E