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ELECTRICAL
209
Fig. 335 - Cutout relay for regulator assembly GN 2/12/16.
1.
BI-metailic hlnge.spring. -
2.
Armature. -
3.
Body. -
4.
Adjusting
spring. -
5.
Setting arm. -
6.
Armature stop. -
7.
Base. -
8.
Stationary
contact blade spring. - 9. Core.
When rescrewing the resistor attaching nuts be
also careful not to damage the resistor wire while
handling the wrench.
Subsequently. check armature-to-core air gap of
current and voltage regulators. taking the measure-
ment on core edge towards contacts.
Gap should
equal .0391" to .0437" (0.99 to 1.11 rom).
Finally check regulator setting in accordance with
the instructions given under «Adjustments )).
The above checks are indispensable since the
voltage and current regulator cores, and relevant
frarnes, are interconnected and mounted on base
by the same nuts that secure the regulating resistor.
4
6
8
\
In
such a case some damage to the contacts may.
in fact, take place, such as:
oxidation of voltage or current regulator con-
tacts (low or very low no-load voltage);
- welded voltage regulator contacts (uncontrol-
led voltage reaching very high values);
- welded current regulator contacts (uncontrol-
led
current reaches very high values).
Inspect the resistor and make sure that the wire
is not broken at some point and that no coils aYe
shorted.
In doubtful cases, remove the resistor and test
at 68° F (20
0
C); resistance must be 80 to 90 Ohms.
This operation can be performed without taking
off resistor from regulator.
Just insert a lintIess
paper between current and voltage regulator con-
tacts and take reading across terminals 51 and 67.
If
a different value is found, replace resistor
by
taking off nuts (2 and 3, fig. 334) with lock washers.
The resistor must not be repaired. A repair is
never satisfactory since special methods and equip-
ment are required.
Replace by a new resistor.
Caution. - IT the resistor is found to be damaged,
remember that to restore regulator efficiency
it will
not suffice to simply replace the resistor. but
it
is
indispensable to inspect the whole regulator.
Should further damages be detected (such as
oxidized contacts, overheated wirings
I
etc ..) the
regulator unit must be replaced.
To reassemble resistor on regulator
refit nuts
(2 and 3,
fig.
334), being careful not to forget lock
washers, which should be replaced in their original
position.
Fig. 336.
Adjusting generator regulator
in thermostat oven
Ap. 5\)t4
for temperature stabilization.
1. Oven Ap. 5014. - 2. Stationary
contact blade spring.•
3.
Blade
spring adjusting fork.• 4. Gener-
ator. - 5. Test bench.
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