fully counterclockwise and all on-off
toggle switches to the "OFF" posi-
(white-lead to stack
tion (some toggle switches have cen-
adjusting screw
0.2 ohm approximately
end)
with coil not energized
known serviceable condition (par.
(4) Line switch.
126) on the low speed driving head
200 amperes
Rating
18 volts
Closing voltage
Opening voltage
7 to 15 volts
range
175 millivolts
Millivolt drop
60 ohms, plus or minus
(4) Connect the generator to the genera-
10%
of the test stand, as shown in figure
(5) Polarized voltage relay.
46, using applicable leads and cable
23 volts, approximately
Closing voltage
8 volts, approximately
Opening voltage
235 ohms
between "B-" and "G-" regulator
(6) Differential and reverse current relay.
0.3 to 0.7 volt above
Differential closing
battery voltage
(6) M o u n t t h e 4 0 0 - a m p e r e g e n e r a t o r
Differential coil
control box undergoing test on the
1.9 ohms, approximately
resistance
control box mounting plate (number
Reverse current
35 to 45 amperes
opening
Reverse current coil
Connect the generator control box to
1.9 ohms, approximately
resistance
the regulator binding post panel using
(7) Miscellaneous resistors.
applicable harnesses and leads as
(a) Fixed resistors.
500 ohms
Stabilizing
Operating coil of
20 ohms
regulator circuit
(7) Check to see if the toggle switch on
Stabilizing for
500 ohms
regulator
"ON" position, then slide the safety
Polarized voltage
clip (21-B) off the stop button (21-C)
100 ohms
and depress the start button (21-A)
(b) Variable resistors.
(do not hold the start button de-
Regular circuit
pressed more than 10 seconds) to
20 ohms
operating coil
start the varidrive assembly. Check
Differential circuit
pulley (par.
coil . . . . . . . . . . . 150 ohms
(8) If it is necessary to change the rota-
(c) Rectifiers.
tion of the generator (correct rotation
Polarized voltage
is important, otherwise, the generator
qty - 1
will have no output), stop the vari-
Differential relay
drive assembly by pushing the stop
coil circuit
qty - 1
button (21-C), let the varidrive as-
c. Preparation.
sembly come to a complete stop, and
(1) Turn all selector switches beneath the
place the drive reversing switch (fig.
meters on the test stand to the maxi-
12) in the opposite position (par.
mum reading position, all rheostats
96