TYPE 11—Edwards Dual Motor

Power is applied only through relay K6 to the run motor for normal timekeeping. During power interruptions (while clocks are stopped) and during correction, the master clock accumulates the number of seconds. Immediately after power is restored, both relays K6 and K5 operate. Relay K5 applies power to the 10 RPM motor for 1/10th the number of seconds accumulated, causing the clocks to advance to the correct time. After correction, relay K5 opens and relay K6 continues to operate.

For daylight saving, the master either automatically de-energizes relay K6 to cause the clocks to lose one hour, or energizes K5 for approximately six minutes and 40 seconds to advance the clocks one hour.

If the clocks lose their synchronization with the master clock, they can be manually reset using the [9]=SYNCH. CLOCKS function. See page 3-5.

X = Normally open contact

I = Normally closed contact

1 = V250LA4 MOV or equal

 

 

 

 

 

 

 

CODE 09 = 59TH MIN.

 

 

 

 

RELAY

 

 

RELAY

 

 

 

 

CODE 10 = 45TH MIN.

 

 

K5 (K7)

 

 

 

 

 

 

 

K6 (K8)

 

 

 

 

 

 

 

 

x

 

x

I

 

I

 

 

 

 

 

 

 

x

 

 

CLK1 OR CLK2

 

 

 

 

 

 

 

MASTER CLOCK

1

2

3

4

5

6

7

8

FIELD CONNECTIONS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAST ADVANCE MOTOR

10 ASB MAX.

 

 

 

 

 

 

 

1

120Vac

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 RPM RUN MOTOR

 

 

1

 

 

 

 

 

 

AC RTN

 

 

 

 

 

 

 

RETURN

Figure B-13

Edwards Dual Motor

24A715/24A715M Master Clock Installation Manual

B-15