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TYPE 27—Simplex 2310 Dual Motor
Type 27 secondary clocks have the same hourly corrections as type 09, with the addition
of 12-hour corrections as for type 03.
Power is normally applied to the 1 RPM run motor. Each hour, from HH:58:05 through
HH:58:59, power is removed from the run motor and applied to the fast advance motor.
During manual clock corrections, power is applied to both motors for 4 minutes and 15
seconds.
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.
Types 28, 29, and 30
For wiring information on Type 28 (Stromberg 12-hour), Type 29 (Type 01 Special), and
Type 30 (Type 14 Special) clocks, contact Lathem Time Corporation.
24A715/24A715M Master Clock Installation Manual
B-31
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-28
Simplex 2310 Dual Motor