TYPE 14—Electronic Coded Clocks

Clocks normally run with 120Vac power. For bells or clock correction, the generator prestart relay (K6) first turns on for the signal generator to reach frequency. K6 turns on at the 00 second after a programmed time or manual bell time. Then relay K5 turns on for three seconds, from the 10th to the 13th second, to apply the generator signal (coded cup start signal) onto the 120Vac. Bell circuits then turn on for three seconds, in the order listed below, applying the generator signal onto the 120Vac for decoding by the coded cups.

The bell relay contacts must connect in parallel with the normally open contacts of relay K5. If it is not time for a clock correction signal, K6 turns off at the 59th second. At the 57th minute of each hour, K5 turns on from 57:54 to 58:02, applying the 8-second hourly correction generator signal onto the 120Vac. At 5:57 AM and 5:57 PM (12-hr correction), K5 turns on from 5:57:54 to 5:57:08, applying a 14-second 12-hour correction generator signal onto the 120Vac. For daylight saving, the clocks advance to the proper time by normal 12-hour correction, not at 2:00 AM. See Figure B-16on page B-19.

The time sequence of each relay operation is listed below.

Relay

From

To

From

To

K6

Generator Prestart (hourly correction)

HH:57:00

 

 

H:59:00

K5

Start Signal (hourly correction)

HH:57:00

HH:57:13

HH:57:54

HH:58:02

K6

Generator Prestart (12-hour correction)

HH:57:00

 

 

HH:59:00

K5

Start Signal (12-hour correction)

5:57:10

5:57:13

5:57:54

5:58:08

K6

Generator Prestart (bells)

HH:MM:00

HH:MM:59

 

 

K5

Start Signal (bells)

HH:MM:10

HH:MM:13

 

 

Bell Circuit 6

HH:MM:20

HH:MM:23

 

 

Bell Circuit 5

HH:MM:25

HH:MM:28

 

 

Bell Circuit 4

HH:MM:30

HH:MM:33

 

 

Bell Circuit 3

HH:MM:35

HH:MM:38

 

 

Bell Circuit 2

HH:MM:40

HH:MM:43

 

 

Bell Circuit 1

HH:MM:45

HH:MM:48

 

 

B-18

24A715/24A715M Master Clock Installation Manual