of the low voltage output is made on the terminal board
in top of transformer. Remove the terminal board cover
Never apply power to trailer unit
and connect terminals as shown in L ¥ winding table on
before making sure unit is grounded
transformer nameplate for the desired voltage. See
and connections are tight.
2-5. Voltage Conversion.
Voltage Ratio Change. The transformer
is provided with a wedge-type tap changer to change
Never make voltage changes with
voltage ratio without breaking the transformer seal to
make this change, see paragraph 3-12 d.
perpersonal injury and/ or damage to
the transformer may result.
Low Voltage Change. This conversion
Section II. MOVEMENT TO NEW WORK SITE
2-6. Dismantling for Movement
Close and secure the two trap
Preparation for Movement.
doors underneath the low voltage cabinet in trailer bed.
(1) Push trip button (5, fig. 2-11) on main
Make sure the 3 ammeter,
breaker in low voltage cabinet.
voltmeter, heater and light switches are in off positon.
Move main and feeder breaker
breakers. 15 fig. 215)
to the full racked in position and tripped.
(3) Using switch operating handle, turn load
Close and secure both front
break switch to off. Make a sight inspection through
doors of low voltage cabinet.
window ( 1 ,fig. 2-1 ) of high voltage cabinet to make
Disconnect the ground wire
sure switch is open. Return switch operating handle to
from the ground rod and stow it.
Remove the ground rods and
(4) Place bar (4) in bracket to cover the
stow on the deck.
operating handle socket (3) and lock with padlock.
Remove guardrail and access
(5) Check and make sure power source has
ladder. Stow ladder on forward deck, guardrail and chain
been turned off to this substation.
in storage cabinet.
(6) Remove primary cables at the power
Check that all panels have been
source, and feeder lines.
replaced and doors secured on all cabinets.
(7) Remove upper and lower rear panels of
Trailer is now ready to be
the high voltage cabinet.
connected to its prime mover. Connect electrical leads
and air hose into trailer, raise the landing gear to full up
conductors from the load break switch ( 1, fig. 2-4).
Disconnect the fourth conductor from ground lug (4) at
Check brake air pressure and
the left bottom .
charge system if needed. Remove wheel blocks.
(9) Until primary cable and ground wire
Movement. The trailer should be
down and out (of cabinet.
moved according to Army standards for trailers.
Close the trap door (3) and
2-7. Reinstallation After Movement
secure with its bolt. Replace cabinet bottom cover (5).
Reinstallation. Refer to paragraph 2-4,
Replace upper and lower rear
panels of high voltage cabinet.
Installation or Setting Up Instructions.
Replace primary cable on its
If Trailer is Stored or Parked.
cable reel on rear 4 of trailer and secure with tie to drum
(1) Connect the 115 VAC power cord to a
115 VAC supply. Turn heaters and
Open rear doors of low voltage
cabinet and disconnect feeder cables from the three
(2) Make sure transformer liquid is at
feed breakers .
proper level. Add dry nitrogen in gas
Replace feeder cables on their
space until the pressure reaches 3
cable reels on rear of trailer, secure with tie to drum
side, engage the drum lock bar.
Turn light and heater switch to
Transformer stored as spares should
be maintained in the same condition
Disconnect 115 V service from
as if in service.
its power source and pull cables on hangers inside left
inspections of liquid level.
of right rear door of loss voltage cabinet.
pressure gage to make sure seal is
Disconnect ground wire in right
bottom of low voltage cabinet.
Close and secure rear doors of