DETROIT DIESEL 53
BATTERY-CHARGING GENERATOR REGULATOR
A.C. CHARGING CIRCUIT
The current generator regulator is similar
The relay contact points remain closed as long as the
in outward apperance to the regulator used with the
D.C. voltage is enough to hold the relay armature
D.C. generator. The D.C. and A.C. regulators are
against the core. They open when the voltage
decreases to a value at which the magnetic pull of the
core can no longer overcome the armature spring
The internal wiring circuit of all standard A.C.
generator regulators are similar hut the internal
connection vary somewhat according to the method
used to control the circuit breaker relay.
There are two and three unit standard A.C. generator
The voltage regulator unit has a core with a single
regulators: the two unit regulator\ have a circult
shunt winding. This winding also consists of fine wire
breaker relay controlled by a relay rectifier or by an
and is connected across the D.C. side of the power
oil pressure switch and the three-unit regulators have a
rectifier. The assembly and parts are similar to the
circuit breaker relay controlled by a built-in control
circuit breaker relay. The matching upper contact
point is supported by a detachable contact support
insulated from the frame.
The generator field circuit is insulated in the generator
and grounded in the regulator. This type of connection
is designated as Circuit "A".
NOTE: Each type of regulator is used with a
certain circuit Do not attempt to interchange
If the voltage regulator unit is not operating. the
generator held circuit is completed to ground through
the contact points which are held closed by the tension
of a spiral spring acting on the armature.
The two unit A.C. generator regulator has a circult
breaker relay and a voltage regulator unit while the
When the D.C. voltage of the A.C. - D.C. system
three unit regulator is is equipped with a control
reacher the value for which the voltage regulator is
relay in addition to the other two units.
adjusted, the magnetic fieId produced by the shunt
winding overcomes the armature spring tension and
pulls the armature down, causing the contact points to
CIRCUIT BREAKER RELAY
separate. When the contact points separate, resistance
is Introduced into the field circuit. The resistance
The circuit breaker relay has a core with the winding
decreases the field current causing a corresponding
made up of many turn of fine wire. This core and
decrease in generator voltage and magnetic pull on the
winding are assembled into a frame. A flat steel
regulator armature. This allows the armature spring
armature is attached to the frame by a hinge and is
tension to re-close the contact points. When the
centered above the core. Two contact points, supported
voltage again reaches the value for which the voltage
by two flat springs on the armature. are located above
regulator is adjusted, this cycle repeats and continues
two stationary contact points. The upper and lower
to repeat many times a second. thus limiting the
contact points are held apart by the tension of a flat
voltage to the value for which the regulator is set.
spring riveted to the top side of the armature.
With the voltage limited in this manner, the generator
supplies varying amounts of current to meet the
various states of battery charge and electrical load.
When the D.C. voltage reaches the value for which the
circuit breaker relay is adjusted. the magnetism
Voltage regulators are compensated for variations in
induced in the core by current flow in the winding is
temperature by means of a hi-metal thermostatic
sufficient to overcome the armature spring tension and
hinge on the armature. The effect of this hinge causes
the relay points close. Closing of the contact points
the regulator to adjust at a higher voltage when cold.
connects the D.C. side of the power rectifier to the
which partly compensates for the facts that a high
batter) so that current will flow to the hatter)
voltage is required to charge a cold battery.
whenever the generator is driven at sufficient speed.
May, 1971 SEC. 7.1.1 Page 3
Page 1 and 2 not used)