TM 9-4940-549-14&P
sing the button located on each of the braces. Turn handle one-
quarter turn counterclockwise to secure the door.
Erecting Tenting.
d.
(1) Remove the straps that secure the tent frames to the roof of
the shop set and remove the frames from the shop set.
(2) Refer to figures 4-6, 4-7, and 4-8 for instructions for assem-
bling and erecting the tent frames and tenting. The tent frames
and rear diagonal brace will fit either side of shop set.
External Power Connection. Connect external power of 240-volt,
e.
3-phase, 60 hertz input whenever it is available, as illustrated in
power source is contained in paragraph 2-5b.
Static electricity and leakage currents
from electric equipment can build up in
the shop set and cause injury or death
to personnel unless the equipment is pro-
perly grounded.
Grounding Shop Set. Drive a metal ground rod into the ground
f.
adjacent to the right side of the shop set. Attach a No. 6 bare
copper wire between the shop set ground terminal (fig. 4-10) and
the ground rod.
EQUIPMENT CONVERSION. The dynamotor-welder can be driven by the shop
set engine or by an external power source. If an external power
source is to be used connect the power source and set the frequency
switch (fig. 4-11) to match the frequency of the incoming current, as
shown by the frequency meter, either 50 or 60 hertz, and set the
power selector switch on CITY. Conversion to shop set generated
power is accomplished by stopping all shop set functions, turning
switches to OFF and by removal of the external power source, setting
the frequency switch (fig. 4-11) to 60 hertz, and the power selector
switch to GENERATOR. The output from the receptacles on the control
panel is either 120-volt, single-phase, at a maximum of 30 amperes, or
240-volts, single-phase, at a maximum of 10 amperes. To use either
120 or 240-volts form either GENERATOR or CITY power source, select
the appropriate output receptacle or receptacles and the applicable pow-
er selector switch and frequency switch setting as indicated in figure
4-6
