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TM-499 Page 25
PART NAME CIRCUIT SYMBOLPICTUREFUNCTION
CLAMP A spring-loaded connection device. A good
example would be the “work clamp” used to
connect the weld cable from a power source
to the workpiece that will be welded.
CONTACTOR A heavy duty relay. Usually used to make
and break the welding arc or primary power.
W
COIL
NRM OPEN
POINTS
W
CURRENT
TRANSFORMER
A transformer that produces an AC voltage
used for measuring purposes. The primary
winding is in series with the circuit carrying
the current to be measured. Its main use in
engine-driven equipment is to activate the
“Automatic Idle” circuit by sensing welding
current or auxiliary power current.
CT1
OR
CT1
DASHED LINE A dashed line between parts means there is
a mechanical connection between these
parts. When a dashed line boxes in parts,
this means the parts make up an option or
are combined into one part. In all cases,
dashed lines do not conduct electricity. The
picture shown is a combination fan motor and
transformer in one part.
FM
DIODE A device that allows current to flow in one
direction only. Most common use is to
change AC to DC.
D1
FAN MOTOR This device provides cooling of the internal
parts of a welding power source.
FM
FUSE A protection device, usually an enclosed
piece of wire that melts and breaks the circuit
when the current exceeds the fuse rating.
F1
GAS OR WATER
SOLENOID
(VALVE)
These are electromechanical devices used to
start or stop the flow of shielding gas or
water.
GS1
OR
WS1
HALL DEVICE Produces a small DC voltage proportional to
the current it is sensing (usually welding
current). This feedback signal can be used to
regulate the welding output (line voltage
compensation). It may even be used to drive
an ammeter.
HD1