Control Box Assembly (Interior); Emergency Shut Down Device - Hobart Jet-Ex 5D Operation And Maintenance Manual

OM-2094 / Operation and Maintenance Manual
Jet-Ex 5D / Series 500285 / Generator Set
h. Control Box Assembly (Interior)
Numbers in parentheses below can be crossed referenced in Figure 6
(1) Over voltage relay (K403)
The over voltage relay is a solid-state protective device on a printed circuit board. A normally
closed relay in the circuit is wired into the load contactor coil circuit. An over voltage condition
causes the relay contacts to open, which in turn prevents the contactor from closing, or opens
the load contactor and discontinues the power delivery. The over voltage module is adjusted to
trip at 32 to 34 volts DC in .5 seconds ±.2 seconds.
(2) Voltage regulator (VR402)
The voltage regulator is a solid-state device which regulates the 28.5 Volts DC generator output
after the voltage is built up.
(3) Excitation rectifiers (CR417 and CR418)
Two diode bridge rectifiers, convert an AC voltage from the generator armature to the DC
voltage needed for the generator revolving field.
(4) 3 Control Windings Fuses—cartridge-type—10 amp each (F406 - F408)
(5) Voltage Build-up Fuse—cartridge-type—10 amp (F405)
(6) Voltage Regulator Fuse—cartridge-type—10 amp (F403)
(7) Throttle Solenoid Fuse—cartridge-type—20 amp (F409)
(8) Control Panel Lights (DS401, DS402, & DS420)
Three control panel lights provide illumination for instruments and controls.
(9) Rectifier Harness Connector (J43)
Provides connections between the control box and the Rectifier assembly.
(10) Engine Harness Connectors (J46 & J47)
Provides connections between the control box and engine compartment components.
(11) Rectifier (CR401)
Automatic Voltage Build-Up.
(12) Capacitor (C403)
A 100mfd, 350V DC Capacitor, that filters the DC excitation volts produced by rectifiers CR417
and CR418.
i. EMERGENCY SHUT DOWN DEVICE
In addition to the other devices provided by the engine manufacturer, an engine shutdown feature is
added by Hobart Brothers. Since diesel engines typically require several minutes of running at idle
speed before shutdown, this push button switch is intended for use in emergencies only.
(1) EMERGENCY SHUTDOWN push button switch S413
This push button switch has one purpose: To provide immediate shut off of the generator set by
disconnecting power to the fuel solenoid through the control box. Once pushed, it must be
pulled back out to restart the generator set. It is located on the rear panel, below the control box.
To operate the EMERGENCY SHUTDOWN push button switch:
· Push button in until engine stops or until button travel stops.
· Pull the button back out to reset.
November 1, 2000
Revised 07/01
Chapter 1-1
Page 15