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Brush holder, Battery charge components, Excitation circuit components – Guardian Technologies 4270 User Manual

Page 11

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Section 2

MAJOR GENERATOR COMPONENTS

3. Two excitation winding output leads (No. 2 and 6). These leads

deliver unregulated excitation current to the voltage regulator.

4. Three (3) battery charge output leads (No. 55, 66 and 77).

Figure 2-2. – Stator Output Leads

BRUSH HOLDER

The brush holder is retained in the rear bearing carri-
er by two M5 screws. It retains two brushes, which
contact the Rotor slip rings and allow current flow
from stationary parts to the revolving Rotor. The posi-
tive (+) brush is located nearest the Rotor bearing.

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 14 amp fuse and Wire No. 15. A
one ohm, 25 watt resistor is connected in series with
the grounded side of the circuit.

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
(CB2).

Figure 2-5. – Schematic: Excitation Circuit

EXCITATION CIRCUIT BREAKER:
The excitation circuit breaker (CB2) is self-resetting
and cannot be reset manually. Should the breaker
open for any reason, excitation current flow to the
Rotor is lost. The unit’s AC output voltage will then
drop to a value equal to the Rotor's residual magnet-
ism (about 7-12 VAC).

DPE WINDING

VOLTAGE

REGULATOR

POWER WINDING

ELECTRONIC

0F

FIELD

CB2

0K

2

2A

22S

4

6

4

11S

BATTERY CHARGE WINDING

TO BATTERY

TO ENGINE

CONTROLLER

CIRCUIT BOARD

0N

R1

55

15

77

BCR

66

66

BCR = Battery Charge Rectifier
R1 =

One Ohm, 25 Watt Resistor

BRUSHES

2

6

11

11

22

22

33

44

66

55

77

Leads 2 & 6 =Stator Excitation Winding
Leads 11 & 22 = Voltage Sensing Leads
Leads 11 & 22, 33 & 44 = AC Power Windings
Leads 55, 66, 77 = Battery Charge Windings

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