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TYPE 07—Dukane Digital Clocks
For a list of Type 07 clocks, see the chart on the first page of this appendix.
—IMPORTANT—
Dukane digital clocks MUST be connected to CLK1
(relays 7 and 8) on the master clock. Also, for the
master clock to operate Dukane Digital clocks, its
factory-installed relay K7 MUST be replaced with a
solid-state relay, part number 596-303, available
from Dukane in the Model 438-860 kit.
Notes:
Dukane Model 24D20 and 24D40 are only used with 15Vdc power when being added
to existing installations. In new installations, these two models should be used with
24Vac power.
See the 24D20 and 24D40 installation manuals (document numbers 427-11-00035
and 427-11-00036) for instructions on establishing the current capacity for the 24Vac
power supply.
During normal operation the clock signal is grounded once every minute at zero seconds
(HH:MM:00) to increment the time display. Once every 24 hours the master clock
synchronizes all clocks to 12:00:00 AM.
The master clock automatically synchronizes the clocks after a power failure or when the
master time is reset. During synchronization the clocks reset, then after 40 seconds the mas
-
ter clock slowly advances the clocks to the correct time. The clocks can be manually reset
using the [9]=SYNCH. CLOCKS function (see page 3-5), or by momentarily interrupting
the AC power to the master clock.
B-10
24A715/24A715M Master Clock Installation Manual