within the selected range with the D.C. ampere
adjusting rheostat. The voltage and amperage will
frequency switch to either 50 or 60 cycles as in-
be indicated on the D.C. meters.
dicated by the meter.
(e) Place R3 circuit breaker in the ON
The dynamotor start switch should not be energized.
Under these operating conditions, all A.C. circuits are
(f) 120-V power is available from R3 duplex
r e c e p t a c l e s ONLY. Shop set lights are also
e . Welder Operation. Refer to TM 9-237 for
d. Operation with Power Selector Switch in OFF
(1) Refer to paragraph a above, and energize
the system with internal power; refer to paragraph
(1) To develop D.C. current for welding,
b above, and energize the system with external
when A. C, current for operating shop set is not
power, or, refer to paragraph d above.
(2) Connect electrode and ground cable to
OFF. Start the engine and accelerate to 1,200
d y n a m o t o r - w e l d e r output terminals (positive
electrode and negative ground ).
(2) The required D.C. current is now available
(3) Place the polarity switch in the desired
at the positive and negative welding terminals.
the desired ampere range and adjust the amperage