Generac Power Systems 5410, 5412, 5411, 5413, 5415, 5414 Brush Holder, Excitation Circuit Components

Section 2

MAJOR GENERATOR COMPONENTS

	2
	6
	11
	22
Stator	33
	44
	11S
	22S

Leads 2 & 6 = Stator Excitation Winding Leads 11S & 22S = Voltage Sensing Leads Leads 11 & 22, 33 & 44 = AC Power Windings

Figure 2-2. – Stator Output Leads

Brush Holder

The brush holder is retained in the rear bearing car- rier 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.

BRUSHES

Figure 2-3. – Brush Holder

Excitation Circuit Components

GENERAL:

During operation, the Rotor’s magnetic field induces a voltage and current flow into the Stator excitation winding. This results in AC output delivered to a volt- age regulator via Wires 2 and 6.

11S			11S	11S
22S			22S	22S
			4	4	+
		0	0	0	-
			6	6
			2	2
			VOLTAGE
			REGULATOR
6	2	4	0

DPE WINDING	FIELD
	BA

Figure 2-5. – Schematic: Excitation Circuit

VOLTAGE REGULATOR:

Six (6) leads are connected to the voltage regulator as follows:

•Two (2) SENSING leads deliver ACTUAL AC output voltage signals to the regulator. These are Wires 11S and 22S.

•Two (2) leads (Wires 4 and 0) deliver the regulated direct current to the Rotor, via brushes and slip rings.

•Two (2) leads (Wires 6 and 2) deliver Stator excita- tion winding AC output to the regulator.

VOLTAGE

ADjUST POT

LED

2

6

0

4 22S 11S

Figure 2-7. – Voltage Regulator

The regulator mounts a “VOLTAGE ADJUST” potentiometer, used for adjustment of the pre-set REFERENCE voltage. A lamp (LED) will turn on to indicate that SENSING voltage is available to the regulator and that the regulator is turned on.

Adjustment procedure:

With the frequency set at 60 Hertz and no load on the generator, slowly turn the voltage adjust pot on the volt- age regulator until 122-126 VAC is measured. If voltage is not adjustable, proceed to Section 6 – Troubleshooting.

Page 9