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perfectly, and it is essentlal that the 179R contact
be open when the relay Is In the reset position.
ESCAPEMENT
The speed
of
the gear train and cam shaft during
reset Is Hmited by an escapement cons istlng of a
star wheel cam, fastened
tc
the idler gear, and a
cam follower.
The follower pivots about a lower
bearing and is guided by an upper bushing and
washer. The lower bearing has an eccentric mount-
Ing. screw which permits adjustment elf the two
projections of the follower with relation to the star
wheel.
Normally, this eccentric bearing should not
require adjustment during the full life of the relay.
1f the adjustment is Inadvertently disturbed, the
bearing should be reset so that a line through the
two follower projections passes approximately
through the center of the motor shaft, and the clamp
screw retightened.
The relay should bEl operated
through its entire cycle by releasing the clutch and
turning the knurled knob on the front. There should
be some play between the follower proj ections and
the star wheel cam at every point In the timing
cycle.
1f there is any tendency for the follower to
bind or jam, the eccentric bearing should be adjusted
until the bind is eliminated.
Be sure that both
screws are securely tightened after adjustments are
completed.
INTERLOCKING UNIT 179E
As previously described In the PRINCIPLES
OF OPERATION, this unit Is a mechanically inter-
locked device.
The operation of the latching mechanism, plus
the gap and wipe of the contacts are
tWO
features
that should be checked.
The latching must be positive as each of the
armatures are operated by hand.
To
,~heck
the
correctnesF of the adjustment, place a 1.5 mil
shim
between the armature and pole piece and
operate the armature so that it will bear against the
shim.
1f the latch'ng is positive under these cir-
cumstances, the mechanical interlocking is satis-
factory.
To confirm the contact adjustment, first see
that all the open contacts have at least a 0.02 inch
gap.
Second, check the wipe on all the closed con-
tacts, by depressing the stationary contact members
and noting that the movable members follow for at
least a 5 mil deflection.
Third, check the contact
wipe on those contacts that close when the a,rmatures
are operated, as follows: Place a two mil shim
between the
armatur~
and pole piece, and hold the
armature in the pickea up position. 1f the contacts
are closed under these conditions, the resulting
wipe will be adequate when the shim is removed.
Finally, check to see that these same contacts
uinta in their wipe when held closed by the latching
rrangement alone, by deflecting the stationary
members as described above to see that a five mil
wipe is present.
Reclosing Relay Type ACR
GEH-1786
PERIODIC INSPECTION
It is suggested that mechanical Inspection
of
the
relay
be
made once every six months.
The relay
should
be
turned by hand through Its complete cycle
and the operating sequence of the auxlltary switches
checked with reference to the detailed description
given above. The clutch should
be
released manually
with the relay in the locked out position to be sure
that the mechanism resets properly. Thelnterlock-
Ing unit should be operated by hand In both directions.
CAUTION: After any mechanical inspection of
the relay, be sure that the Inter locking unit 179E Is
In its reset position before the relay is replaced In
Its case.
When reset, the armature
of
the upper
unit should be latched in •
PERIODIC TESTING
TIME CHECKS
When the relay Is installed, recloslng Intervals
may be desired which differ from the settings
originally made at the factory. 1f the approximate
settings indicated by the numbers on the dial plate
are not accurate enough, more exact settings may be
made by following the circuit In Fig. 9 and the des-
cription which follows.
The relay may be tested
while In Its case at the installation by using test
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SOURCE OF
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CIRCUIT}
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SOURCE OF
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CONTROL
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CLOSING
CIRCUIT)
11511 A.C.
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RESISTOR TO /
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VOLTAGE RATING OF
CLOSING CIRCUIT
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STANDA
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TYP
TIIofER
TIMER CLUTCH COIL
RO ELEe.
[ AC-l
Fig.
9 (362A672.l)
Test Connections for
Relay
l'JPe
ACR
17
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