Guardian Technologies 4582 & 4987 Manual De Usuario
section 3
DescRiption & coMponents
DescRiption & coMponents
Figure 3-2. – The 2-Pole Rotor Assembly
STATOR ASSEMbLY
The stator can houses and retains (a) dual AC power
windings, (b) an excitation winding, and (c) two bat-
tery charge windings. A total of thirteen (13) stator
leads are brought out of the stator can as shown in
Figure 3-3.
The stator can is sandwiched between an engine
The stator can is sandwiched between an engine
adapter and a rear bearing carrier. It is retained in that
position by four stator studs.
11
44
22
77A
55
77
6
2
66
66A
55A
44S
11S
Figure 3-3. – Stator Assembly Leads
bRUSH HOLdER ANd bRUSHES
The brush holder is retained to the rear bearing car-
rier by means of two Taptite screws. A positive (+) and
a negative (-) brush are retained in the brush holder,
with the positive (+) brush riding on the slip ring near-
est the rotor bearing.
Wire 4 connects to the positive (+) brush and Wire 0
to the negative (-) brush. Wire 0 connects to frame
ground. Rectified and regulated excitation current, as
well as current from a field boost circuit, are delivered
to the rotor windings via Wire 4, and the positive (+)
brush and slip ring. The excitation and field boost cur-
rent passes through the windings and to frame ground
via the negative (-) slip ring and brush, and Wire 0.
This current flow creates a magnetic field around the
rotor having a flux concentration that is proportional to
the amount of current flow.
4
0
Figure 3-4. – Brush Holder and Brushes
OTHER AC gENERATOR COMPONENTS
Some AC generator components are housed in the
generator control panel enclosure. These are (a) an
Excitation Circuit Breaker, (b) a Voltage Regulator,
and (c) a main line circuit breaker.
EXCITATION CIRCUIT BREAKER:
The Excitation Circuit Breaker (CB2) is housed in the
The Excitation Circuit Breaker (CB2) is housed in the
generator control panel enclosure and electrically
connected in series with the excitation (DPE) wind-
ing output to the Voltage Regulator. The breaker is
self-resetting, i.e.; its contacts will close again when
excitation current drops to a safe value.
If the circuit breaker has failed open, excitation current
If the circuit breaker has failed open, excitation current
flow to the Voltage Regulator and, subsequently, to
the rotor windings will be lost. Without excitation cur-
rent flow, AC voltage induced into the stator AC power
windings will drop to a value that is commensurate
with the rotor residual magnetism (see Figure 3-5).
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