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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.
24A715/24A715M Master Clock Installation Manual
B-15
12345678
CLK1 OR CLK2
x
x
x
x
RELAY
K6 (K8)
RELAY
K5 (K7)
II
MASTER CLOCK
FIELD CONNECTIONS
X = Normally open contact
I = Normally closed contact
AC RTN
10 ASB MAX.
120Vac
FAST ADVANCE MOTOR
1RPMRUNMOTOR
RETURN
1
= V250LA4 MOV or equal
1
1
CODE 09 = 59TH MIN.
CODE 10 = 45TH MIN.
Figure B-13
Edwards Dual Motor