Control Box Mod. A/3-140/24; Regulator Unit As Seen From The Circuit Breaker Side; Cross Section Of Regulator Unit - Fiat 411 R Service Manual

COHTROL EOX MOD. A,t3-1-£€l,i24
Description-
The Fiat A,'3~14G,»'24 regulator unit: contains three elements: voltage regulator, current limiting regulator
and circuit-breaker. These three elements (Fig. 138), fastened to the block, are enclosed in a sealing
cover, equipped with gasket, which prevents shocks, dust and dampness.
Mote. — A distinction will be made in the test between modifications made on regulator units with numbers
up to 088917 and on those with numbers starting 088918 up; the numbers are marked on the
coven
Figs. 139 and 'I40 represent voltage regulator and circuit breaker; the current limiting regulator iooks
quite similar to the voltage regulator.
Fig. 141 represents the wiring diagrams of the regulator units mounted on tractors series 400, and bearing
the production number up to 088917 and from number 088918 up. The diagrams have thick lines to represent
the coiis in series on the generator recharge circuit, to differentiate them from the shunted ones gm the
same circuit.
Ali armature stops are of the spring blade type, and adjust their toad according to the calibration value,
through the screw located at each regulator unit element side.
The temperature increment due to the shunted circuit currents and deriving thermal expansion. might
influence the calibration values of the voltage regulator and of the circuit breaker. This is prevented by
the Contact hinges, which, being bimetallic, are thermally compensated.
The group bears the following terminal numbers:
— 51 - connected to positive generator terminal;
- 67 - connected to generator field coils;
- 31 - grounded;
- 30 - connected to the battery positive terrnirral and to etectric system.
The wiringdiagram oi Fig. 127, points out the valve (FPS) protecting the regulator group.
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Fi§- T33» ' R99?-liilifll' unit (from no. 083918 up) as seen
from the circuit breaker side.
i. Terminal 31 - 2. Terminal 51 - 3. Terminal 30 - 4. Vottage
regf.1latorto_current regulator connection - 5. Current reguiator
""95 '*'""di"Q _terminai soidered to circuit breaker - 8. Cur-
FQRT Feilvlator rixect contact connection with the regulating
resistance.
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Fig. 139. ~ Cross section of reguiator unit: (section shows
voitage regulator}.
1. Armature adjustment spring - 2. Calibration screw ~ 3. Vol-
tage regulator body - 4- Armature - 5. Fixed contact holder
screw - 6. Fixed contact bridge - 7. Hinge steel spring (the
bimetallic blade is located on top).
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