Lathem Dukane 24A715 - Manual (Page 25)

Setting Up the Master Clock
Once the master clock is installed, it is ready for programming. This chapter covers the
programming instructions needed to set the master clock for operations.
Note:
To completely clear the clock of all settings and reset the master clock to its factory-
shipped configuration, press the following number sequence on the master clock key
pad: 355379768274. This clears all programmed schedules and reinitializes the
master clock.
Programming Relays
If the master clock will control one type of secondary clock, relays #7 and #8 on terminal
block P1 are used for this purpose. If the master clock will control a second clock type,
relays #5 and #6 on terminal block P2 are used for those clocks. See Table 2-1.
Here are some possible ways to program the master clock relays:
• Eight bell zones that can last from 1 to 99 seconds. Use this setup if the master clock
will not be used to synchronize secondary clocks. (Note: The maximum closure time
provided by this master clock is 99 seconds. Closures longer than 99 seconds will re-
quire an external latching relay. This is not provided by Dukane.)
• Six bell zones and one wall clock synchronization control. Use this setup if the master
clock will only synchronize one type of clock in one string.
• Four bell zones and two wall clock synchronization controls. Use this setup if the mas-
ter clock will synchronize two clock types, or if there are two strings of clocks
(typically 20 to 35 clocks to a string).
24A715/24A715M Master Clock Installation Manual 2-1
Section
Configuration
2
Bell
Zone #1 Bell
Zone #2 Bell
Zone #3 Bell
Zone #4 Bell
Zone #5 Bell
Zone #6 Bell
Zone #7 Bell
Zone #8
Relay
#1 Relay
2# Relay
#3 Relay
#4 Relay
#5 Relay
#6 Relay
#7 Relay
#8
Clock Sync #2 Clock Sync #1
Table 2-1
Relay Usage