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LTRx-512 Installation and User’s Guide
Wiring Diagrams
41
Type 14 - ELECTRONIC CODED CLOCKS
Clocks run normally with 120 VAC power. For any bells or clock correction, the generator prestart relay (SK1)
first turns on for the signal-generator to reach frequency. SK1 turns on at the 00 second after a programmed
time or manual bell time. Then relay SK2 turns on for 3 seconds, from the 10
th
to the 13
th
second, to apply the
generator signal (coded cup start signal) onto the 120 VAC. Bell circuits then turn on for 3 seconds, in the
order listed below, applying the generator signal onto the 120 VAC for decoding by the coded cups. The bell
relay contacts must connect in parallel with the normally open contacts of relay SK2. If it is not time for a
clock correction signal, then SK1 turns off at the 59
th
second. At the 57
th
minute of each hour, SK2 turns on
from 57:54 to 58:02, applying the 8-second hourly correction generator signal onto the 120 VAC. At 5:57 AM
and 5:57 PM (12-hr correction), SK2 turns on from 5:57:54 to 5:57:08, applying a 14-second 12-hour correction
generator signal onto the 120 VAC. For daylight savings, the clocks advance to the proper time by normal 12-
hour correction, not at 2:00 AM. The order of each relay operation is listed below (see NOTE for Type 15 re:
SK1):
RELAY FROM TO FROM TO
SK1 Gen. Prestart (hourly corr.) H:57:00 H:59:00
SK2 Start Signal (hourly corr.) H:57:10 H:57:13 H:57:54 H:58:02
SK1 Gen. Prestart (12-hour corr.) H:57:00 H:59:00
SK2 Start Signal (12 hour corr.) 5:57:10 5:57:13 5:57:54 5:58:08
SK1 Gen. Prestart (bells) H:MM:00 H:MM:59
SK2 Start Signal (bells) H:MM:10 H:MM:13
Bell Circuit 6 H:MM:20 H:MM:23
Bell Circuit 5 H:MM:25 H:MM:28
Bell Circuit 4 H:MM:30 H:MM:33
Bell Circuit 3 H:MM:35 H:MM:38
Bell Circuit 2 H:MM:40 H:MM:43
Bell Circuit 1 H:MM:45 H:MM:48
For Masters including firmware versions prior
to V2.17 only:
NOTE: The LTRx-512 was designed for clocks
that do not require a generator pre-start to set
the frequency level. Clocks using this pre-start
may not work with the LTRx-512 older than
V2.17
All circuits should be fused or protected by a circuit breaker (10Amp maximum)
TYPE 15 - STRAIGHT FREQUENCY
Bells should not be scheduled for:
HH:58:SS