Lathem Dukane 24A715 - Manual (Page 49)

TYPE 04—Standard Electric Time AR-2A Two-Wire, Dual Voltage
Each minute, from 58 seconds to 00 seconds, a low-voltage pulse (24Vdc) is transmitted.
The secondary clocks receive the pulses until the 59th minute. At this time, from 50 sec-
onds to 00 seconds, a higher voltage pulse (48Vdc) is required to advance to the hour.
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), all at 24Vdc. Normal minute
pulses are inhibited during these pulses.
24A715/24A715M Master Clock Installation Manual B-7
1 2 3 4 5 6 7 8
CLK1 OR CLK2
x
x
x
x
RELAY
K6 (K8)
RELAY
K5 (K7)
I I
MASTER CLOCK
FIELD CONNECTIONS
X = Normally open contact
I = Normally closed contact
RTN
10 ASB MAX.
24Vdc
AB
PC
2 = 1N4004 diode or equal
48Vdc
2
Figure B-5
Standard Electric Time AR-2A Two-Wired, Dual Voltage