TM5-6115-593-34
NAVFAC P-8-631-34
TO-35C2-3-463-2
(4)
Rotor. Perform a growler test on the
rotor as follows:
(a)
Place the rotor on the growler and
energize.
(b)
Hold a thin piece of metal, such as
a hack-saw blade, directly over the
top slot of the rotor and along the
length of the slot. If the coil is
shorted the blade will vibrate
rapidly and cause a growling noise.
(c)
If the above test is not met,
proceed with the repair
procedures.
(5)
PM Generator Exciter Field. Perform
the following resistance checks:
(a)
At lead separation box, disconnect
and tag PM generator exciter field
leads (there are three; the
common; the 50 Hertz tap; and the
60 Hertz tap).
(b)
Using a double Kelvin bridge,
check the resistance between the
common lead and the 50 Hertz
tap. Resistance should be 1.1
ohms ±10 percent.
(c)
Using a double Kelvin bridge,
check the resistance between the
common lead and the 60 Hertz
tap. Resistance should be 1.35
ohms ±10 percent.
(6)
PM Generator Permanent Magnet. The
strength of the magnet field surrounding
the permanent magnet (rotor), because
of its in accessibility, may not be
checked directly. However, if the AC
output of the PM generator is within ±10
percent of 135V AC at 1800 rpm, the
permanent magnet may be
considered normal. If the PM generator output
is out of tolerance and checking the resistance
of the PM exciter field (as indicated in the
previous subparagraph 5) produces positive
results, the permanent magnet, by the process
of elimination, may be considered defective. If
defective,
refer
to
paragraph
11-6
for
replacement procedures for permanent magnet
rotor assembly.
b.
Replacement.
(1)
Removal. The following steps are for the
removal of the generator from the
generator set frame.
(a)
If generator set is equipped with a
housing kit remove panels (34 and
30, figure 15-21) and strip (27).
(b)
The permanent magnet assembly
must be removed prior to removing
generator from generator set, as
follows (see figure 11-3):
(1)
Remove screws (16 and 28), washers
(29), and nuts (27) and remove cover
(30).
(2)
Remove screws (31) and washers (32)
and remove permanent magnet stator
(33).
WARNING
USE EXTREME CARE WHEN REMOVING
ROTOR TO PREVENT INJURY TO HANDS DUE
TO MAGNETIC ATTRACTION BETWEEN THE
PERMANENT MAGNET GENERATOR ROTOR
AND THE PERMANENT MAGNET GENERATOR
STATOR OR GENERATOR SHAFT.
(3)
Remove bolt (34), washers (35) and
spring pin (36) and remove magnet rotor
(37).
11-10
