Fig. 15
Test Connections for Checking Polarity of
the Directional
Internal Connections
should be locked in this position by the set screw
provided for this purpose. The upper bearing pin
should next be adjusted so that the disk shaft has
about
inch end play.
CONTACT ADJUSTMENT
The contacts should have about
inch wipe.
That is, the stationary contact tip should be de-
flected about
when the disk completes its
travel. Wipe is adjusted by turning the wipe adjust-
ment screw thereby adjusting the position of the
brush relative to the brush stop. On two-circuit
closing relays, the two stationary contact tips
should be in the same vertical plane.
When the time dial is moved to the position
where it holds the contacts just closed, it should
indicate
on the time-dial scale. If it does not
and the brushes are correctly adjusted, shift the
dial by changing the position of the arm attached to
the shaft just below the time dial. Loosen the screw
clamping the arm to the shaft and turn the arm
relative to the shaft until the contacts just make
for
time-dial setting.
BEARINGS
The lower jewel bearing should be screwed all
the way in until its head engages the end of the
12
. GEH-2032 Ground Directional
Relay Type
threaded core support. The upper bearing should
to allow about
inch end play to the
To check the clearance between the iron
and the inside of the rotor cup, press down on
contact arm near the shaft, thus depressing
spring-mounted jewel until the cup strikes the iron
The shaft should move about
inch.
CUP AND
Should it be necessary to remove the
rotor from the directional unit, the following pro
cedure should be followed:
All leads to the unit should first be
and tagged for identification in reconnecting. Th
“nit can then be removed from the cradle with it;
mounting plate still attached.
The upper of the three flat-head
the “nit to the plate should now be removed. 0
some models, it may be necessary to remove
resistor or capacitor to expose this screw. Th
four corner screws clamping the “nit together
should next be removed, and the entire top
lifted off.
This gives access to the cup as
sembly and exposes the
assembly,
should be protected to keep it free from dust
metallic particles until the “nit is reassembled.
To remove the shaft and rotor from the
head assembly, the spring clip at the top of the
must be pulled out and the clutch adjusting
out of the side of the molded contact
The shaft and
can now be pulled out of
molding.
The rotor must be handled very
while it is out of the unit.
CONTACT ADJUSTMENTS
To
contact adjustments, refer to Fig. I
for identification of low gradient contact parts
proceed as follows:
Loosen the locknut which secures the
screw (located at the right hand corner of the uni
to its support. Unwind the backstop screw so
the moving contact arm is permitted to
Adjust the tension of each low gradient
brush so that l-2 grams of pressure are
at the contact tip in order to cause the end of
brush to separate from the inner face of its
spective brush retainer. Adjust the spiral
until the moving contact arm is in a neutral pos
i.e., with the arm pointing directly
Loosen the locknut which secures the
contact mounting screw to the stationary
support. Wind the mounting
inward until
and
contact
. Unwind the mounting screw until
stationary contact stop screw lines up with tl
moving contact brush retainer. Wind the
screw inward until the moving
and
members again just begin to touch.
the locknut of the stationary contact stop
advance this screw until it just touches the
contact brush retainer.
Unwind the screw l-l
