Auxiliary Power In Ms-Receptacle; Overload, Overcurrent And Fault Protection - Red-D-Arc DC-600 Operator's Manual

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6. Mode Switch
This switch allows for selecting the welding
process to be used:
CC STICK-for SMAW and AAC
CV SUBMERGED ARC- for SAW
CV INNERSHIELD- for FCAW and GMAW
7. 115VAC Duplex Receptacle (60 Hertz Models)
This receptacle provides up to 15 amps of 115
VAC auxiliary power.
8. 115VAC 15 Amp Circuit Breaker
This breaker protects the 115 VAC auxiliary cir-
cuits located in the duplex receptacle, terminal
strip (T.S.2) and MS-receptacle.
9. 42VAC 10 Amp Circuit Breaker
This breaker protects the 42VAC auxiliary circuits
located in the terminal strip (T.S.2) and MS-recep-
tacle.
10.14 Pin MS-Receptacle
This connector provides easy connection for a wire
feeder control cable. It provides connections for
auxiliary power, output switching, remote output
control, wire feeder voltmeter sense lead and
ground. Refer to 14 Pin MS Type Receptacle in the
Installation Section for information about the cir-
cuits made available at this receptacle.
11.Terminal Strip Cover Panel
Rotate this panel to gain access to the circuits
made available at the two terminal strips (T.S.1
and T.S.2). These terminal strips contains the
same circuits as the 14 pin MS-receptacle. There
is a box connector adjacent to this cover for routing
leads to the terminal strips.
12.Negative Output Terminal
This output terminal is for connecting a welding
cable. To change welding polarity and for proper
welding cable size refer to Electrode and Work
Cables in the Installation Section.
13.Positive Output Terminal
This output terminal is for connecting a welding
cable. To change welding polarity and for proper
welding cable size refer to Electrode and Work
Cables in the Installation Section.
OPERATION

AUXILIARY POWER IN MS-RECEPTACLE

42 volt AC auxiliary power, as required for some wire
feeders, is available through the wire feeder MS-
receptacle. A 10 amp circuit breaker protects the 42
volt circuit from overloads.
DC-600 machines can also supply 115 volt AC auxil-
iary power through the wire feeder receptacle. A 15
amp circuit breaker protects the 115 volt circuit from
overloads.
OVERLOAD, OVERCURRENT, AND
FAULT PROTECTION
This welder has thermostatic protection from exces-
sive duty cycles, overloads, loss of cooling, and high
ambient temperatures. When the welder is subjected
to an overload or loss of cooling, a thermostat will
open. The input contactor will open and remain open
until the machine cools; the red POWER light stays
illuminated. No welding is possible during this cool
down period. The machine will reset automatically
when the thermostat cools.
The power source is also protected against overcur-
rents in the SCR bridge assembly through an elec-
tronic protection circuit. This circuit senses currents
over 780 amps on the power source and opens the
input contactor should the overcurrent remain for a
predetermined time (the red POWER light stays illumi-
nated). The predetermined time varies with the
amount of overcurrent; the greater the overcurrent,
the shorter the time. The input contactor will remain
open until the power source is manually started by
resetting the POWER ON/OFF toggle switch.
The power source circuitry is protected from faults on
leads 75, 76, or 77. If any of these leads are connect-
ed to either the positive or negative output leads, the
DC-600 will either shut down completely (input con-
tactor opens and red POWER light stays illuminated),
or will operate at minimum output thus preventing any
damage to the DC-600. If DC-600 shuts down, it must
be manually started by resetting the POWER ON/OFF
toggle switch.
DC-600
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