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TYPE 12—Cincinnati D6 Clocks
Normal pulsing is sent out on lines A and C from second 58 through second 00 each
minute. From minute 59 through minute 49, line A is positive with respect to line C.
From minute 50 through minute 58, except from 4:49 through 5:55 AM and PM, line C is
positive with respect to line A.
To provide hourly corrections, 20 rapid pulses at 0.5Hz are transmitted on lines A and C,
line C being positive with respect to line A, during the 59th minute of each hour from
second 10 through second 50.
To provide twelve-hour corrections, 20 rapid pulses at 0.5Hz are transmitted from second
10 through second 54 of each minute from 5:00:10 through 5:30:54 AM and PM.
Manual clock advances and daylight saving advances cause the master clock to transmit
62 pulses (one second ON and one second OFF at 0.5Hz). The first five pulses are trans
-
mitted with line A positive with respect to line C. The remainder of the pulses are
transmitted with line A negative with respect to line C. Normal minute pulses are inhib
-
ited during these pulses.
B-16
24A715/24A715M Master Clock Installation Manual
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CLK1 OR CLK2
x
x
x
x
RELAY
K6 (K8)
RELAY
K5 (K7)
II
MASTER CLOCK
FIELD CONNECTIONS
X = Normally open contact
I = Normally closed contact
+
10 ASB MAX.
–
AB
PC
1
= V250LA4 MOV or equal
1
CODE 09 = 59TH MIN.
CODE 10 = 45TH MIN.
2
= 1N4004 diode or equal
2
24–36Vdc
Figure B-14
Cincinnati D6 Clocks