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LTRx-512 Installation and User’s Guide
Wiring Diagrams
42
Clock correction and bell circuit operations are generated by sequentially applying various frequencies onto
the 120 VAC. Each bell and clock correction circuit has its own frequency. Each bell and clock
correction
circuit has a receiver circuit that applies the associated bell or clock frequency (3510 Hz normally used
for
clock signals). For daylight savings, the clocks advance to the proper time by normal 12-hour correction, not
at 2:00 AM. The time sequence of applying the frequencies to the 120 VAC is shown below, and the Master’s
bell and system relays control these frequencies:
RELAY FROM TO
Bell Ckt. 1 H:MM:00 H:MM:05
Bell Ckt. 2 H:MM:05 H:MM:10
Bell Ckt. 3 H:MM:10 H:MM:15
Bell Ckt. 4 H:MM:15 H:MM:20
Bell Ckt. 5 H:MM:20 H:MM:25
Bell Ckt. 6 H:MM:25 H:MM:30
SK2 (Hourly Correction) H:57:54 H:58:02
(12-Hour Correction) 5:57:54 5:58:08
SK1 (Hourly Correction &
12-HourCorrection) H:57:00 H:59:00
(Bells) 35 sec of min 30 sec of
previous to Bell time
Bell
NOTE: Bells must be programmed 1 minute ahead of desired time.
Bells will not work during manual clock corrections and at the 58
th
minute.
For Masters including firmware versions
prior to V2.17 only:
NOTE: The LTRx-512 was designed to
work with 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 firmware older
than V2.17.
All circuits should be fused or protected by a
circuit breaker (10Amp maximum
)
Bells should not be
scheduled for:
HH:58:SS
or
00:00:SS