TYPE 03—Standard Electric Synchronous

During normal operation, 120Vac is applied to the run motor. A 15-minute correction signal on the correction motor line causes a 12-hour correction from 5:12:00 to 5:28:00. This occurs twice daily (AM and PM). Run motor power is connected during the 12-hour correction. A 29-second signal is applied to the correction motor line from HH:59:30 to HH:59:59 to cause hourly corrections. During hourly corrections, power is disconnected from the run motor line.

X = Normally open contact

I = Normally closed contact

1 = V250LA4 MOV or equal

 

 

 

 

 

 

 

 

RELAY

 

 

RELAY

 

 

 

 

 

K5 (K7)

 

 

 

K6 (K8)

 

 

 

 

 

 

 

 

x

 

x

I

 

I

 

 

 

 

 

 

 

x

 

 

CLK1 OR CLK2

 

 

 

 

 

 

 

MASTER CLOCK

1

2

3

4

5

6

7

8

FIELD CONNECTIONS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CORRECTION MOTOR

10 ASB MAX.

 

 

 

 

 

 

 

1

120Vac

 

 

 

 

 

 

 

RUN MOTOR

1

AC RTN RETURN

Figure B-4

Standard Electric Synchronous

B-6

24A715/24A715M Master Clock Installation Manual