Red-D-Arc D502K 5+4, Technical Manual

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TM-4412 Page 34
D502K 5+4
PART NAME CIRCUIT SYMBOL PICTURE FUNCTION
MOTOR A device that is typically used to feed wire in
a MIG welding system.
B1
SHUNT A precision low-value resistor typically used
to supply a small voltage to drive an
ammeter.
SHUNT
MOSFET A device that is used as an “electronic
switch.” When a signal is applied to the gate
(G), current is allowed to flow from the source
(S) to the drain (D). This device can be used
to control a relay, the speed of a motor, or
even the output of a welding machine.
D
G
AS
S
IGBT A device that is used as an “electronic
switch.” When a signal is applied to the gate
(G), current is allowed to flow from the emitter
(E) to the collector (C). This device is typically
used in “Invertor” designed welding machines
to control the welding output.
C1
G1 (B1)
E1
BRUSHES/SLIP
RINGS Components that allow electrical connections
between stationary and rotating contacts.
SLIP
RINGS
BRUSHES
TERMINAL STRIP An insulated connection point for wires. They
are used for the ease of making multiple
connections and can be a convenient point
for making electrical checks when
troubleshooting. (Notice the “jumper link”
connecting terminals A and B together.)
A B C D E
1T
42 42 104 105 74
SWITCH A mechanical device that completes or
breaks the path of the current or sends it over
a different path.
SPDT SPST
DPDT DPST