switch, momentarily, to energize the A.C. generator
the air compressor, lathe, and mill may be operated.
Place the control circuit breaker (fig. 2-13) in the ON
portion of the dynamotor-welder.
position and press the dynamotor-welder start switch
momentarily. The generator portion of the dynamotor-
With selector switch in GENERATOR position, the
welder is now functioning as 25 hp. motor to drive
welder is driven in the proper rotation. All sequences of
the welder portion.
operation duplicate CITY position except 240-V
(4) Rotation is clockwise from driving end.
EXTERNAL power receptacle which is now output
rather than input.
observe the fan blade rotation through slot in the
cubicle side of dynamotor-welder. Correct rotation
of fan as viewed through the slot is downward. To
A.C. output voltage adjustments maybe made with the
c o r r e c t the rotation, interchange any two of the
i n c o m i n g leads.
output adjustments may be made with the D.C.
ampere selector switch and D.C. ampere adjusting
which indicates the correct frequency of the in-
coming power. If it is not compatible with the
(7) After performing steps 1 through 6 above,
frequency switch setting, set switch correctly. The
the synchronous motor becomes an A.C. generator.
A.C. voltmeter will indicate input voltage. Power is
The dynamotor-welder provides power for welding.
The welder is driven by the synchronous motor.
b. Operation on External (CITY) Power.
c. Operating on EMERGENCY Power.
(1) Place all switches and circuit breakers in
(1) General. When neither internal nor 3.
the OFF position.
phase, 240-volt A.C. external power is available, it
is impossible to operate the dynamotor-welder or to
rating of the incoming power; either 50 or 60
provide current to the shop set contents. Under
cycles, and place the power selector switch in the
these conditions, an external 120-volt, single-phase
50-60 cycle current may, if available, be used to
(3) Install the power cable into the receptacle
furnish power for limited operation of the shop set
) and then connect terminal end
240-volt, 3-phase power supply.
(2) Operational procedure.
(a) Make sure all switches throughout the
Do not install an energized power cable
shop set are in the OFF position and that no
a s arching will damage the terminal
equipment or appliance is plugged into the 120-
p i n s of the receptacle and may also
damage terminals inside the cubicle
(b) Place the power selector switch in the
With the selector switch in the (CITY) position,
(c) Refer to (fig. 2-16) and connect the
connect outside sourceof 3-phase, 240-volt A.C. power
em erg en c y power source.
to power receptacle. 240-volt single-phase power can
now be used from R4, R 5, and R6 receptacle. Also