GE ACR11B - Page 8

GEH-~786 Recl68lng Relay Type ACR
SWITCH
FUNCTION
OPERATED BY
LOCATION
AE-BC
Delayed Reclosure Front Cams
Front Plate, Upper Right
MN
Reset Front Cams
Front Plate, Lower Left
DE
Limit Switch Reset Cam Shaft
Right Rear
GH-HI
Limit Switch Lockout
CamShaft
Left Rear
JK
Alarm Cam Shaft
Right Front
RS
Spare Cam Shaft
Left Front
R
Clutch Release Seal-In
Clutch Armature Rear Lover Center
Fig. 5 (362A676-l) Schematic Represen-cation of the Operating Mechanism in the ACR Type Relay
of the Interlock. At the same time, the circuit for
other unit is set-up by the contacts of the unit
operated.
Driving torque is transmitted from the syn-
chronous motor through a crown-gear clutch con-
sisting of a driving member pinned to the motor
shalt, and an idler member. The idler member,
which Includes a star cam and a pinion, is free to
slide back and forth on the motor shalt and is nor-
mally held In engagement with the stationary mem-
ber by a compression spring which is a part of the
clutch release seal-in switch. This compression
spring acts to hold the clutch release armature in
a
position which forces the idler member against
the stationary member of the clutch. The pinion
on the
idler member drives gear "A", which is
pinned to the auxiliary cam shalt, causing a wind-
up of the
reset spring. The auxiliary cam shalt,
which turns through slightly less than 360 degrees
d'll"ing a complete operating cycle of the redosing
relay, carries depressions in its body which operate
the roller-actuated, snap-action switches "GH-HI",
"DE", and "JK" , performing auxiliary functions
which will
be described later. The auxiliary shalt
also carries an adjustable cam segment which can
be set to operate switch "RS" at any desired point
in
the reclosing cycle.
The
front dial hub is, In turn, driven through the
gear pair, "B" and "C", and makes slightly less than
• half revolution during a complete operating cycle
'lie reclosing r$Y. The dial hub carries a set
adjustable cams, "D" and "E". These cams
""nsist of round, flat plates with either two dia-
metrically opposite projections in the case of "D"
8
or a single proj ection in the case of "E". There are
three single ended "E" cams. One of these cams is
normally set to hold the "AB-Be" switch in the
closed
position, for the purpose of setting up the
circuit for immedlate Initlal reclosure. The other
two are set back-to-back, providing in effect a single
cam projection which is used to operate the "MN"
switch, following the immediate reclosure. This
latter setting determines the time Interval between
the
immedlate initial reclosure and the ~esetiing of
the
relay, if reclosure is successful, as will be
described later in more detail. The double-ended
cams "D", also three In number, are used to initiate
delay reclosures and to reset the relay following
successful delayed reclosures. One end of the cam
operates switch "AB-Be", initiating a delayed re-
closure. The other end of the same cam operates
switch "MN" a short interval later, causing the
relay to reset if the reclosure is successful. The
Interval between a delayed reclosure and reset Is
determined by the location of switch "MN" in
relation to the reclosing switch nAB-Be", and thus
will be the
same for all delayed reclosures.
A third type of cam, designated as "F", is
keyed In position on the dial hub. Its function is to
operate switch "MN" and initiate reset of the reiay
after a manual reclosure of the breaker, with the
relay in its locked-out position.
Resetting of the relay is accomplished by en-
ergizing the coil of the clutch-release unit 179R,
which
attracts the release armature and draws the
idler member of the clutch away from the fixed
driving member. This permits the gear train,
cam shalt and dial hub to return to the reset
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