Voltage Regulator Support - Hobart Jet-Ex 4D Operation And Maintenance Manual

OM-2063 / Operation and Maintenance Manual
Jet-Ex 4D / Specs 7003A-3 and 7003B-3 / Generator Sets
The panel lights switch (8, Figure 3) turns the lights (7) on and off. The engine start switch (16) is a
momentary contact pushbutton which closes the starter relay (8, Figure 2) and cranks the engine.
This switch is operable only when the engine switch (18) is held in its top spring-loaded START
position.
The engine switch (18) , when released from its top START position after the engine starts, will return
to center RUN position. The engine ON light (14) will glow as long as the switch is in RUN position.
In the bottom STOP position, the switch will stop the engine and the light (14) will go out.
Refer to Figure 3. The speed control switch, (13) is a two-position toggle switch wired to an idling
device on the engine. In the IDLE position, used for starting, the engine speed is controlled
approximately. In the Rated RPM position, engine speed is controlled to approximately
2000 RPM.
f. Fuses
Three cartridge-type fuses protect the engine ignition circuit, the panel lights circuit, and the voltage
regulator. The engine circuit fuse (13, Figure 3) is rated at 20 amperes, the panel lights fuse (9) at 10
amperes, and the voltage regulator fuse (4, Fig. 4) at 10 amperes.
g. Voltage regulator
Refer to Figure 4. The voltage regulator (1) is a solid-state device which regulates the 28.5 volt DC
generator output after the voltage is built up.
Chapter 1-2
Page 8
1. Excitation Rectifiers
2. Voltage Sensing Relay
3. Overvoltage Relay
4. Voltage Regulator
5. Voltage Regulator Fuse

Voltage Regulator Support

Figure 4
Dec 31/92