10
5000/5100 Series Digital Analog Clocks Installation and Operation Manual
Chapter 1: DAC-5000 Series Digital Analog Clocks
Impulse Clock Mode
The DAC-5000 Series clocks will emulate a standard impulse clock.
Like any impulse clock, it must be manually set to the correct time and
will stop if the impulses from the master clock also stop. The unit will
check the polarity of the pulses so that the positive pulses from the red
input connector on the rear panel will move the second hand to an even
number of the clock face (i.e. 2, 4, 6 etc.), while the black input
connector will handle the odd numbers.
This check will only occur after the position of the second hand is
known by the microprocessor. This takes place when the hand passes
the detector located near the 12:00 position.
Correct hand position will be established automatically by the
microprocessor when the clock hands pass their detection positions.
However, to establish the minute hand, the position of the second hand
must be already established. To establish the hour hand, the position of
both the minute and second hands must also be established.
The error LED will not be on when operating as an impulse clock.
Secondary Reference Mode
The DAC-5000 Series clock will run as a standard wall clock with no
exterior Timecode or Impulse drive when selected by the run on
secondary switch SW5. Selection of either Internal reference or Line
frequency is done by switch SW3. Correct hand position is established
in the same manner as for the Impulse Clock. The time must also be set
manually.
The error LED will not be operational when this mode is selected.
Clock Setting Controls
Manual Setting
The clock is manually set by means of three push-buttons located on the
rear panel.
•
MANUAL SET
Press this button once to select the hour hand,
twice to select the minute hand, three times to select the second
hand, and four times to set the clock. When selected, the hands will
start shaking briskly to visually indicate their status.
