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Figure 23. Relay removal and installation
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TM-5-6115-423-15 Load Bank 0-30 KW; AC; Portable Skid Mounted (Sun Electric Corp Model GPT-3D-1) FSN 6115-964-1091 Manual
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Section IV. REPAIR OF RELAY
TM 5-6115-423-15
CHAPTER 7
REPAIR INSTRUCTIONS
Section 1. REPAIR OF VARIABLE TRANSFORMER
c. Cleaning, Clean all metal parts with an
79. General
approved cleaning solvent and dry thoroughly.
The variable transformer is a three gang,
d. Inspecting. Visually inspect the variable
240 volt, 50 to 1000 cps input, 0 to 240 volt,
transformer for cracks, damaged threads, and
10 ampere maximum output, three phase wye
bent terminals. Inspect variac brushes for wear,
constant impedance load unit. It provides
corrosion, or damage.
stepless control of load from 0 to 3 kw. It is
operated manually by a control knob located on
e. Testing.
the control panel.
(1) Test each gang transformer for open
circuits using a multimeter applied to
80. Repair of Variable Transformer
each of two terminals in combination.
On Equipment Test. Refer to paragraph
(2) Test each gang transformer for
72.
b. Removal and Installation. Refer to para-
grounds or insulation breakdown by
applying one probe of multimeter to
graph 72 to remove and install the variable
transformer.
each terminal and the other to ground.
Section Il. REPAIR OF AUTO TRANSFORMER
c. Cleaning. Clean dust and dirt from auto
81. General
transformer using compressed air.
The auto transformer is rated as follows:
d. Inspecting. Visually inspect the auto
240 volt, 50 to 1000 cps, single phase input;
transformer for bent terminals, damaged or
120 volt 1 percent output at 1 KW; forced
stripped threads, loose connections, and frayed
air cooling at 500 lineal feet per minute, 125
insulation.
degree F. ambient.
e. Testing.
(1) Test the auto transformer for open
82. Repair of Auto Transformer
circuits using a multimeter applied to
each of two terminals in combination.
a. On Equipment Test. Refer to paragraph
(2) Test the auto transformer for grounds
73.
or insulation breakdown by applying
one probe to multimeter to each
b. Removal and Installation. Refer to para-
terminal in turn, and the other probe
graph 73 to remove and install the auto trans-
former.
to ground.
Section Ill. REPAIR OF RECTIFIER
connected in single phase, full wave bridge,
83. General
rated at 30 volt DC at 122 degrees F ambient,
The rectifier is of the selenium type, consist-
ing of four 3 by 3 inch, 40 volt rms cells
and is convection cooled.
39

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