Specifications

from the power input circuit. This current is rectified to DC and reapplied via A1 pins F+
and F- to the AC alternator rotor brushes at G2 pins + and -. The application of direct
current to the rotor increases the field magnetism between the AC alternator stator and
rotor which in turn, increases the current measured across the alternator power
windings. The current measured at both the excitation and power windings will increase
until the voltage entering the voltage regulator (A1) load sensing circuit matches the set
point at which point, the alternator output stabilizes and the A1 DC output circuit stops
drawing current from the power input
circuit.
The voltage regulator set point can be changed by adjusting the VOLTAGE ADJ.
potentiometer.
The generator set performance can be monitored by observing the AC VOLTS meter
and Hertz Frequency Meter. The VOLTS AC meter (M2) measures the voltage across
the power windings of the AC alternator and displays the value in VAC
from 0 to 300. The HERTZ frequency meter measures frequency across the power
windings in Hz from 45 to 65. The mains circuit breaker protects the VOLTS AC and
HERTZ frequency meters from a potential over current condition.
Low Oil Pressure Protection
The low oil pressure protection system shuts down the diesel engine in the event of low
oil pressure in order to protect the engine from further damage. The system consists of
a low oil pressure switch located in the engine block above the oil strainer, a low oil
pressure solenoid mounted in the control panel, and a cable connecting the low oil
pressure solenoid to the diesel engine STOP lever. The enclosed diesel generator does
not use a pressure solenoid, a electric fuel switch is use instead and is mounted on the
fuel pump.
Under normal operating conditions the low oil pressure sensor switch OPENS at 15 PSI
If a malfunction occurs in the lubrication system causing the oil pressure to drop below
the low oil pressure set point, the low oil pressure switch closes and completes a circuit
causing either the engine stop solenoid to release the engine STOP lever or if equipped,
closes shut the fuel valve located on the fuel pump. When this occurs the low oil
pressure light will illuminate on the generator control panel.
AGI6500DE & AGI6500SDE Operator / Owners Manual Version 11.4
Page 14