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TM-4412 Page 33
D502K 5+4
PART NAME
CIRCUIT SYMBOL
PICTURE
FUNCTION
FAN MOTOR
This device provides cooling of the internal
parts of a welding power source.
FM
VARISTOR
A protection device whose resistance is
dependent on the voltage applied to it. In
normal operation it has a high resistance;
however, a surge of voltage (voltage spike)
will cause its resistance to go way down and
absorb the spike. These devices are most
often found in rectifying circuits, where they
are used to protect the diodes.
VR1
GAS OR WATER
SOLENOID
(VALVE)
These are electromechanical devices used to
start or stop the flow of shielding gas or
water.
GS1
OR
WS1
RELAY––COIL AND
CONTACTS,
NORMALLY OPEN
AND NORMALLY
CLOSED
This is an electromechanical device whose
contacts change state (the normally open
points close and the normally closed points
open) when proper voltage is applied to the
coil. These contact points in turn may control
a fan motor, gas solenoid, contactor, etc.
Circuit diagrams (schematics) always show
the contact points in the power off state.
CR1
CR1
COIL
NRM OPEN
POINTS
NRM CLOSED
POINTS
THERMOSTAT,
NORMALLY OPEN
AND NORMALLY
CLOSED
This is a switch that closes its normally open
contacts (or opens its normally closed
contacts) when a preset temperature is
reached. When the temperature goes back
down, it will reset itself. Uses of these
devices include turning on a fan motor when
needed and shutting off the output of a
welding power source if it is overheating.
NRM OPEN NRM CLOSED
TP1
TP1
CONTACTOR
A heavy duty relay. Usually used to make
and break the welding arc or primary power.
W
W
COIL
NRM OPEN
POINTS
PILOT LIGHT
A light located on the front panel which
indicates if the machine is on or off.
PL
1
STABILIZER/
REACTOR
When placed in a DC circuit, the inductor or
stabilizer as it is usually called, will oppose
any change in existing current. It is therefore
widely used to “stabilize” the welding arc.
When the inductor is placed in an AC circuit it
is referred to as a reactor where it now acts
to restrict the flow of current. A “tapped
reactor” is used to create current ranges for
welding.
Z1
L1
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