1
- No. 6-32NC-2 x screw
19 - No. 6-32NC-2 x 1 screw
2
- No. 6 lockwasher
20 - No. 6 lockwasher
3
- 0.148-in. id plain washer
21 - Coil pot end plate
4
- Insulating washer
22 - Coil core
5
- Short bushing-type insulator
23 - Paralleling coil
6
- Contact screw plate
24 - Operating coil
7
- Contact screw plate insulator
25 - Coil pot
26 - Shim
8
- Contact screw assembly
9
- Carbon pile tube
27 - Armature assembly
10
- Carbon pile
28 - -in. pipe plug
11
- Carbon pile support
29 - Cover
12
- Tab lockwasher
30 - Long bushing-type insulator
13
- No. 6 lockwasher
31 - Contact screw cable
14
- No. 6-32NC-2 x
screw
32 - Spacer
15
- Support O-ring gasket (packing)
33 - Bimetal ring
16
- -in. od plain washer
34 - No. 6-32NC-2 x screw
17
- No. 10 lockwasher
35 - No. 6 lockwasher
18
- No. 10-32NF-2 x screw
Figure 59 - Continued.
(full increase) and then turning
(4) should be 28 volts plus or minus
these adjustments fully clockwise
0.2 volts.
(full decrease). Voltage reading on
(d)
Turn the variable load 0-25 0-12.5
the dc voltmeter (4) should be 25.5
ampere rheostat (19) fully coun-
to 29.5 volts. If the voltage range
terclockwise.
Place one of the
is incorrect, adjust by loosening the
100-50 fixed load switches (17-A)
screw (T, fig. 59) and turning the
in the "ON" position. The voltage
coil core (8, fig. 58). If the voltage
reading on the dc voltmeter (4)
is too high, turn the coil core clock-
should be 27.7 plus or minus 0.3
wise. If the voltage is too low, turn
volts. Place the 100-50 fixed load
the coil core counterclockwise. Set
switch (17-A) in the "OFF" posi-
the voltage at 28.0 volts by adjusting
tion.
the 5-ohm adjustable resistor as-
assembly,
(e)
Stop the
varidrive
sembly with the adjustment (fig.
(a) above, and remove the gen-
57). Tighten the screw (T, fig. 59).
e r a t o r (alternator) from the low
C o n t i n u e with the tests in (4)
speed driving head (5, fig. 7) and
below.
place it on the high speed driving
head (4, fig, 7). Recalibrate the
(4) Checking performance.
tachometer indicator circuitry ac-
(a) Turn the speed control handle (24)
(b) above.
cordingly,
clockwise until 2000 rpm are indi-
assembly
S t a r t t h e varidrive
cated on the tachometer indicator
(f)
meter (3).
(c) above, and turn the speed
control handle (24) clockwise until
4,000 rpm are indicated on the ta-
tor) regulator by placing the 100-50
fixed load switch (17-A) in the
chometer indicator meter (3) and
r e p e a t tests in (b) t h r o u g h ( d )
"ON" position and then the "OFF"
position several times. Place the
above. The voltage reading for the
10 ampere reading, (c) above, should
100-50 fixed load switch (17-A) to
the "OFF" position but leave the
be 27.9-28.3 volts and the voltage
battery on-off switch (22) in the
reading for the 100-50 fixed load,
(d) above, should be 27.3-28.3 volts.
"ON" position.
(c) Turn the variable load 0-25 0-12.5
Turn the speed control handle (24)
(g)
ampere rheostat (19) clockwise un-
clockwise until 8,000 rpm are indi-
til 10 ampere reading is indicated
cated on the tachometer indicator
meter (3) and repeat tests in ( b )
on the load dc ammeter (1). The
t h r o u g h (d) above. The voltage
voltage reading on the dc voltmeter
123
