Komatsu 830E-AC Shop Manual page 241

Set Point: The voltage value to which the regulator is
set. The voltage value is established by the battery
type and the vehicle duty cycle. There are four val-
ues available on the regulator. The set point valve
may be fixed (flat compensation) or variable, based
on operating temperature (negative temperature
compensation).
Significant Magnetism: A change in the strength or
intensity of a magnetic field present in the alternator
rotor shaft when the field coil is energized. The mag-
netic field strength when the field coil is energized
must feel stronger than when the field is not ener-
gized.
Surface Charge: A higher than normal battery volt-
age occurring when the battery is removed from a
battery charger. The surface charge must be
removed to determine true battery voltage and state
of charge.
Voltage B+: A voltage value obtained when measur-
ing voltage at the battery positive terminal or alterna-
tor (B+) terminal.
Voltage, Battery: The steady-state voltage value as
measured with the battery in an open circuit with no
battery load. This value relates to the battery state of
charge.
Voltage, Charge: A voltage value obtained when the
charging system is operating. This value will be
higher than the battery voltage and must never
exceed the regulator voltage set point.
Voltage Droop or Sag: A normal condition which
occurs when the load demand on the alternator is
greater than rated alternator output at a given rotor
shaft rpm.
Voltage Regulator (also Regulator): Device to con-
trol the alternator output voltage. Modern regulators
are solid-state devices. The regulator is mounted on
the alternator. Some regulators have several voltage
set points available for different operating conditions
or battery types.
D10003 07/06 Battery Charging Alternator D10-11