TM 9-4940-549-14&P
range selector switch. For remote fine adjustment at the weld-
ing area, remove the fine adjustment rheostat assembly, pres-
sing upward on the latch under the handle of the rheostat and
pulling outward. Install appropriate cable between rheostat and
outlet.
Do not change the setting of the DC amp-
ere range selector switch, or the fine
adjustment while welding is being performed.
(5) Place the polarity switch in the OFF position when welding is
not being performed, to prevent possible damage to the circuit.
To stop the dynamotor-welder from developing DC current,
the rotation of the dynamotorwelder must be stopped.
(a) When the shop set engine is, the power source and you
have been operating with the power selector switch (fig.
900 rpm to de-activate the centrifugal clutch.
(b) When the shop set engine is the power source, and you
have been operating with the power selector switch in GENER-
ATOR position, press the dynamotor stop switch (fig. 2-4)
and then reduce the engine speed to lower than 900 rpm.
(c) When external power source is used, momentarily press the
dynamntor stop switch.
Air Compressor Operation.
f.
(1)
Energize the electrical system as explained in paragraph 2-5a
or b.
(2)
Switch on air compressor circuit breaker and circuit breaker R1
Open air receiver draincock (fig. 2-3) and drain condensation
(3)
from tank.
(4)
Press start switch (fig. 2-3) to start.
(5)
To stop compressor, push stop button and place the air compres-
sor circuit breaker OFF.
(6)
The air compressor pressure switch (fig. 2-3) will automatically
shut down the compressor when pressure reaches 150 psi; and
will re-start the co-repressor as soon as pressure falls below 125
psi.
Lathe Operation.
g.
(1) Energize the electrical system as explained in paragraph 2-5a
or b.
