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 transmitted 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 inhibited during these pulses.

X = Normally open contact

I = Normally closed contact

1 = V250LA4 MOV or equal

 

 

 

 

 

 

 

CODE 09 = 59TH MIN.

2 = 1N4004 diode or equal

 

 

 

RELAY

 

 

 

 

 

 

 

CODE 10 = 45TH MIN.

RELAY

 

 

K5 (K7)

 

 

 

 

 

 

 

K6 (K8)

 

 

 

 

 

 

 

 

x

 

I

 

 

I

 

 

 

 

 

x

 

 

x

 

 

CLK1 OR CLK2

 

 

 

 

 

 

 

MASTER CLOCK

1

2

3

4

5

6

7

8

FIELD CONNECTIONS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AB

10 ASB MAX.

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

–

 

 

 

 

 

 

 

PC

24–36Vdc

 

2

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

Figure B-14

Cincinnati D6 Clocks

B-16

24A715/24A715M Master Clock Installation Manual