1935 Cadillac - GM Heritage Center

22
Cadillac 355-D, 370-D and 452-D
Current Regulator
contact blade generates heat, and the design and
adjustment is such that when 20 amperes flows with
an ambient temperature of 210°F, this heat will be
sufficient to cause such a deflection in the contact
blade that the points will open. No current will
then flow, the blade will rapidly cool, and the contacts
again close. The current will therefore be
limited, should a short occur in the lighting line.
The opening temperature of the thermostat adjusted
as above is 375 to 385°F.
The cutout relay is of standard construction and
* operation. The adjustment of the cutout relay and
the regulator is made as follows:
1. Cutout Relay. With the armature down, adjust
the air gap at the core to .012 to .017 in., and
the contact opening with the armature up to .015
to .025 in. Then adjust the spring tension so that
the relay closes at 6.75 to 7.25 volts.
Fig. 28. A new feature of the generatorJs the control
box
few minutes per day, and allow' to decrease when
hot to prevent overheating the generator and overcharging
the battery on cars more continuously in
service.
This is provided for in the current regulator by a
bimetal armature hinge, which when heated furnishes
a force opposing spring tension, and causes
the regulator to operate at a lower current when
hot. The amount of this difference depends on the
relation between the force furnished by this hinge
and the spring tension. The spring is used to
balance the armature pull at 10 amperes without
lights, and this spring tension will therefore vary
inversely with the square of the air gap between
armature and pole cores.
Temperature compensation will also vary in this
manner, and may be decreased by decreasing this
gap, or increased by increasing the gap. If the gap
is too small, the vibration frequency of the regulator
will be low, while if it is too great, the force
will be too small to properly operate the armature.
A gap of .063 to .070 in. has been found best.
The thermostat is essentially a bimetal blade in
series with the lighting circuit, completing the
circuit through two silver contacts held closed at
ordinary temperatures by inherent spring pressure
in the bimetal. The current flowing through the
2. Current Regulator. Adjust the stop which hits
the fiber bumper, with the bumper barely touching
the stop, to give an air gap between the center of
the core and the armature of .063 to .070 in. Then
adjust the stop governing the upward travel of
armature, so that with armature in the up position
there is .005 to .008 in. clearance between the fiber
bumper and the stop. The stop governing the
down position of the armature should be adjusted
so that the point opening when armature is down
is .015 to .025 in.
The unit should then be connected to a generator
and battery and an 11 ampere light load turned on.
The armature spring should next be adjusted so
Cutout Relay
Fuse-j Current Regulator /-Resistance
Storage Bgtreryw
Thermostat
Circuit Breaker
Fig. 29. Diagram of the generator circuit