Lathem Dukane 24A715 - Manual (Page 67)

TYPE 19—Stromberg Synchronous Wired (56th Minute)
For a list of Type 19 clocks, see the chart on the first page of this appendix.
This clock is normally operated by 120Vac/24Vac. Relay K5 is normally operated to sup-
ply motor power. Relay K6 activates each hour from HH:56:10 to HH:56:18, causing an
eight-second signal to be transmitted on the correction line for hourly correction. Relay
K6 activates every 12 hours, from 11:56:36 to 11:56:50, causing an additional 14-second
signal to be transmitted on the correction line for 12-hour correction. During power inter-
ruptions and automatic clock resetting, relay K5 is deactivated.
Note:
Lathem SS Modified wall clocks operate according to the above signal operation if
modified to reference the minute and second hands to HH:57:16 (versus HH:59:00)
and the hour hand to 12:00 (versus 6:00).
24A715/24A715M Master Clock Installation Manual B-25
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
120Vac
10 ASB MAX.
CORRECTION COIL
RUN MOTOR
RETURN
1 = V250LA4 MOV or equal
1 1 1
AC RTN
Figure B-22
Stromberg Synchronous Wired (56th Minute)