Battery Charge Components; Excitation Circuit Components - Guardian 4700 Repair Manual

Section 2
MAJOR GENERATOR COMPONENTS
Figure 2-3. – Brush Holder

BATTERY CHARGE COMPONENTS

The Stator incorporates dual battery charge windings.
A battery charge rectifier (BCR) changes the AC out-
put of these windings to direct current (DC). Battery
charge winding output is delivered to the unit battery
via the rectifier, a 7.5 amp fuse and Wire No. 13. A 1
ohm, 25 watt resistor is connected in series with the
grounded side of the circuit.
TO BATTERY
15
77
BATTERY CHARGE WINDING
0N
BCR = Battery Charge Rectifier
R1 = 1 Ohm, 25 Watt Resistor
Figure 2-4. – Battery Charge Circuit

EXCITATION CIRCUIT COMPONENTS

GENERAL:
During operation, the Rotor's magnetic field induces a
voltage and current flow into the Stator excitation
winding. The resultant AC output is delivered to a
voltage regulator via an excitation circuit breaker
(CB3).
Page 8
BRUSHES
TO ENGINE
CONTROLLER
CIRCUIT BOARD
BCR
66
66
55
R1
POWER WINDING
22S
ELECTRONIC
REGULATOR
0K
2A
CB3
2
DPE WINDING
0F
Figure 2-5. – Schematic- Excitation Circuit
EXCITATION CIRCUIT BREAKER:
The excitation circuit breaker (CB3) is self-resetting
and cannot be reset manually. Should the breaker
open for any reason, excitation current flow to the
Rotor will be lost. The unit's AC output voltage will
then drop to a value commensurate with the Rotor's
residual magnetism (about 7-12 VAC).
Figure 2-6. – Excitation Circuit Breaker
VOLTAGE REGULATOR:
Six (6) leads are connected to the voltage regulator
as follows:
• Two (2) SENSING leads deliver ACTUAL AC out-
put voltage signals to the regulator. These are
Wires No. 11S and 22S.
• Two (2) leads (No. 2A and 6) deliver Stator excita-
tion winding AC output to the regulator.
• Two (2) leads (0K and 4) deliver the regulated
direct current to the Rotor, via brushes and slip
rings.
11S
VOLTAGE
4
6
4
FIELD
2
2A