TM5-6115-593-34
NAVFAC P-8-631-34
TO-35C2-3-463-2
d.
Speed Switch Disassembly. Refer to figure 13-1,
cut safety wire and disassemble in sequence of
index numbers observing the following:
(1)
If either the rotor assembly, the
body assembly, or the spacer are damaged
or defective, replace, defective part.
Reassembly. is the reverse order of figure
13-1 sequence of index numbers. Refasten
with lockwire after readjustment.
(2)
Repeat the test and adjustment
procedures in paragraph C, above.
(3)
Refer to Operator/Crew and
Organizational Maintenance manual and
install speed switch.
13-4. ELECTRONIC TYPE SPEED SWITCH (Code "B").
To test speed switch refer to figure 13-3 and the following:
a.General. The electronic speed switch
performs in the same manner as described
in paragraph 13-3a except, rather than
operating by centrifugal force the switch
operates electronically. Output switch
contacts are rated for 10 amps. Elements
S9-1 and S9-2 reset anywhere between 0
and 100 rpm (typically set for 50 rpm)
below actuation speed.
b.Speed Switch Removal. The electronic
speed switch is removed in the identical
manner to the centrifugal switch referred to
in the Operator/Crew and Organizational
Maintenance Manual.
c. Speed Switch Tests
(1)
With an ohmmeter on the
RX1 scale, verify that the switch
contacts are as shown in figure 13-3.
(2)
Connect a variable speed
drive device to the speed switch
drive. The drive device must have a
tachometer in order to determine the
device speed in rpm's.
(3)
Apply 24V DC (+) to pins
A, D and F and (-) to pin I.
(4)
Start variable drive and
gradually increase speed. Using a
DC voltmeter (0-50V DC minimum
scale) across pins B (+) and (-) verify
that voltage goes to zero between
290 and 310 rpm. At this speed
voltage at pin C should be at 24V DC.
(5)
Reduce speed gradually
and verify that voltage at pin C goes
to zero volts 0-100 rpm lower than
pick-up rpm in step 4. At this speed
voltage at pin B will return to 24V DC.
(6)
With voltmeter between
pins E (+) and I (-), zero voltage
should be indicated. Increase speed
and verify that pin E voltage goes to
24V DC between 590 and 610 rpm.
(7)
Reduce speed gradually
and verify that pin E voltage returns
to zero volts 0-100 rpm lower than
pick-up rpm in step 6.
(8)
With voltmeter (+)
connected to pin J, zero volts should
be indicated. Gradually increase
speed and verify that voltage goes to
24V DC between 1100 and 1150 rpm.
At this speed, voltage at pin H will be
at zero volts.
(9)
Reduce drive speed to
zero rpm. Voltage at pin H should
remain at zero and voltage at pin J
should remain at 24V DC until the
blue reset button is depressed.
(10)
All trip speed settings are
factory set and cannot be field
adjusted.
d.
Speed Switch Disassembly Since there are nib
moving parts except the speed switch drive with
virtually no load applied, disassembly is not
required since wear is practically non-existent.
13-5. STARTER ASSEMBLY (Code A). To service the
components of the starter
13-4
