Chevrolet 10 Series 1968, Руководство по обслуживанию

Страница: 434 / 713

ENGINE-ELECTRICAL 6Y-9
2
“ .
/ 1
FUSIBLE LINK
RESISTO R
I
IN D IC A TO R
LAMP
"F” TERMINAL
No. 2 TERMINAL
No. 3 TERMINAL
No. 4 TERM INAL
JUNCTION BLOCK
A CC ESS PLUG TO
V O LTA GE ADJUSTMENT
R EG U LA TO R
D ELCO TR O N
IELD
1 M
F ig . 3 c —Transistor V o ltage Regulator Assembly
and engine not running. When the engine is started and
the generator begins to charge, the indicator light goes
out indicating that the system is operating normally.
The double-contact regulator assembly (fig. 2c) con­
sists of a double-contact voltage regulator unit and a
field relay unit. This unit uses two sets of contact points
on the voltage regulator unit to obtain desired field
excitation under variable conditions. This regulator,
when used with the special 63 amp air conditioning model
generator (4 ohm field coil), uses a field discharge diode
internally in the field circuit (fig. 2c). The added diode
adapts the regulator to handle the higher field current and
enables it to absorb the increased inductive voltages of
the field coil with satisfactory contact point life. A w ir­
ing diagram of the regulator internal circuit is illustrated
in Figure 2c.
The light duty transistor regulator (fig. 3c) is an
assembly composed principally of transistors, diodes,
resistors, a capacitor, and a thermistor to form a com­
pletely static voltage regulating unit in combination with
a conventional vibrating type field relay.
The transistor is an electrical device which limits the
generator voltage to a preset value by controlling the
generator field current. The diodes, capacitor and re­
sistors act together to aid the transistors in controlling
the generator voltage. This is the only function that the
regulator performs in the charging circuit. The ther­
mistor provides a temperature-compensated voltage set­
ting. A wiring diagram of this regulator's internal circuit
is shown in Figure 3c.
The voltage at which the generator operates is deter­
mined by the regulator adjustment. The regulator voltage
setting can be adjusted externally by removing a pipe
plug in the cover (fig. 3c) and turning the adjusting arm
inside the regulator. This procedure is explained in the
following section, and permits regulator adjustments
without removing the cover.
The full transistor regulator used with the 130 amp
generator (fig. 4c) is a completely static unit composed
principally of transistors, diodes, capacitors and re­
sistors. The rotor field current is controlled by differ­
ences in internal voltage and resistance values acting on
BATTERY
REGULATOR
GENERATOR
SWITCH
PLUG
(R E M O V E TO A D JU S T
V O LT A G E S E T T IN G )
FIELD RELAY
F ig . 4 c —V o ltage Regulator for 130 AM P System
CHEVROLET TRUCK SERVICE MANUAL