TYPE 17—Standard Electric Time AR-3 Three-Wire Impulse

Each minute from 58 seconds to 00 seconds, a pulse is transmitted on line. The secondary clocks receive the pulses on line A until the 58th minute. At this time, from 50 seconds to 00 seconds, a pulse on line B is required to advance to the 59th minute.

X = Normally open contact

I = Normally closed contact

2 = 1N4004 diode 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

 

 

 

 

 

 

 

 

 

 

10 ASB MAX.

 

 

 

 

 

 

 

 

 

24Vdc

 

 

 

 

 

 

 

24Vdc PULSE

 

48Vdc

 

 

 

 

 

 

 

48Vdc PULSE

 

 

 

 

 

 

 

 

CORRECTION

TO CLOCKS

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

2

 

DC COMMON CLOCK COMMON WHT

Figure B-20

Standard Electric Time AR-3 Three-Wire Impulse

24A715/24A715M Master Clock Installation Manual

B-23