Operation on External (CITY) Power.

Figure 2-15. Operation of power take-off for dynantotor-welder Model SEOIRL.

Figure 2.16. Connecting the emergency power supply.

TM-5-4940-225-12 Shop Equipment Organizational Repair Truck Mounted (Southwest Truck Body Model Seorl) FSN 4940-169-3041 Manual
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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

NOTE

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

NOTE

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

A.C. voltage adjusting rheostat (fig. 2-13). D.C.

i n c o m i n g leads.

output adjustments may be made with the D.C.

(5) Check the reading of the frequency meter

ampere selector switch and D.C. ampere adjusting

rheostat (fig. 2-13).

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

Power is available at all terminals and receptacles.

now available from all terminals and receptacles.

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

(2) Set the frequency switch to match the

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

CITY position.

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

(fig. 2-7 ) and then connect terminal end wires to

components.

240-volt, 3-phase power supply.

(2) Operational procedure.

CAUTION

(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

volt shop set receptacles.

damage terminals inside the cubicle

(b) Place the power selector switch in the

NOTE

EMERGENCY position.

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

2-21

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