j. The battery terminals are used for external testing and comparison of
battery voltage. The four-position (OFF, 6V, 12V, 24V) battery selector connects
the proper battery circuit for testing. Respective battery indicator lamps
illuminate as the 6V, 12V, and 24V circuits are selected.
k. The headset phone Jack and pile flutter binding posts are used when
audio testing. The pile flutter circuits are used when checking the carbon pile of
generator (alternator) regulators.
l. The ground polarity switch is used to set the proper ground polarity
within the test stand. Most generators and regulators tested will require the
switch to be set to the minus (-) ground position. Positive (+) grounded systems
are rare.
5.
CONTROL BOX RECEPTACLES AND VOLTAGE ADJUSTER (FIG 9).
a. Cables are furnished to connect various types of control boxes to the
test stand. There are four receptacles for connecting 150-ampere control boxes.
When testing 400-ampere control boxes appropriate cables connect the unit under
test to two receptacles on the test stand.
b. The voltage adjuster is used to increase or decrease the generator
output voltage when testing 400-ampere control box receptacles. The voltage
adjuster is a rheostat type control.
6.
STARTER AND LOAD CONTROLS.
a. The starter test switch is a two-position ON-OFF switch which applies
power to the starter voltage adjuster. The starter voltage adjuster is a rheostat
type control used to adjust the voltage to the starter under test.
b. The master load switch is a two-position, ON-OFF, toggle switch. Fixed
loads of 25A, 50A, 100A, and 200A can be selected by the ON-OFF, load bank toggle
switches. There is also a switch to select the variable 0-25A load. Predetermined
loads are selected with the load bank switches and placed in the unit (under test)
circuit with the master load switch.
7.
RIGHT SIDE PANEL (FIG 6).
a. Four terminals and three binding posts are used to connect the regulator
under test to the test stand. The four terminals are designated B+, B-, G+, and
G-. The binding posts are designated GND, D, and F-B.
b. Starter units are tested by utilizing the four starter terminals on the
test stand. The terminals are designated STARTER INPUT, STARTER FREE RUN, STARTER
STALL COMMON, and TORQUE.
c. Alternators are connected to the test stand using three terminals and
two binding posts. The binding posts are designated D and E. The terminals are
labeled ALTERNATOR T1, T2, and T3.
d. D, E, and IGN are the AC system binding post designations. These posts
are used during the testing of alternators (generators) on the test stand.
e. The coil equalizer switch and ignition switch are located below the AC
system binding posts. The coil equalizer switch is an OFF-MOMENTARY-ON toggle
switch used to check alternator dropoff voltage when testing 28V, 100A, or 400A
AC/DC systems and 150A or 400A generator control boxes. The ignition switch is
used in conjunction with the control box of some units under test. It is a two-
position toggle switch.
OS 010, 3-P11
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