TM 55-4920-227-15
b. 440-Volt Conversion
voltage transformer in accordance with the
(1) Remove the screws (4) that secure each of
wiring diagram (fig. 5).
the 5 ampere blower motor heaters (5) in the
thermal overload relays (6) and remove the
12. Inspection of Used Equipment
heaters from the relays. Remove the 100
Inspect a used test stand as outlined in paragraph 8.
ampere varidrive motor heaters (3) from the
Pay particular attention to the parts which might be worn
motor darter thermal overload relays (1) in a
or damaged through se, such as the air duct. Correct all
similar manner.
deficiencies
or
report
them
to
organizational
(2) Install the 3.15 ampere blower motor
maintenance.
heater as prescribed in a(1) above.
(3) Install the 50 ampere varidrive motor
13. Servicing Used Equipment
heaters as prescribed in a(2) above.
Service a used test stand in a manner similar to that
(4) Connect the blower motor, varidrive
prescribed in paragraph 10. Correct all deficiencies or
motor, autotransformer and the dual
report them to organizational maintenance.
Section II. CONTROLS AND INSTRUMENTS
rpm. The tachometer indicator registers the speed (rpm)
14. General
The section describes, locates, illustrates, and
of the high- and low-speed driving shafts.
furnishes the operator with sufficient information
pertaining to the various controls and instruments
17. Raise-Lower Buttons
provided for in the proper operation of the test stand.
The RAISE-LOWER buttons (3 and 4, fig. 9), located
on the control box (2), are manually operated
pushbuttons which are used to raise or lower the speed
15. Star-Stop Buttons
The START-STOP buttons (6 and 7, fig. 9) located
of the driving shafts and generators under test.
on the left front section of the control box (2) are
manually operated pushbuttons which are used to start
18. Indicator Light
and stop the generator drive stand.
The indicator light (5, fig. 9) is located on the control
box (2) directly below the tachometer indicator. It is an
incandescent bulb with a red lens. The indicator light will
16. Tachometer Indicator
The tachometer indicator (1, fig. 9) is located on the
come on approximately 20 seconds after the unit is
control box (2). The needle indicating instrument has a
started and full line voltage is applied to the test stand.
dual scale graduated from 0-7,000 rpm and 0-12,000
AGO 6729A
11
