Setting the Timer:
The relay output time can be programmed for either 1 to 60 seconds, or 1 to 60 minutes,
using the round, black thumbwheel:
1. Determine and set DIP switch #4 according to whether the timing should be measured
in seconds or minutes (see DIP Switch Settings above).
2. Turn the thumbwheel on the SA-025 clockwise to increase time, and counter-clockwise
to decrease time.
3. Test the time, and make adjustments as needed.
NOTE – You should carefully test the time period once it is set.
Sample Installations for Common Timer Applications:
NOTE – The following only represents a few of the many possible ways to use this Timer
Module. For your specific application, it may be necessary to experiment with the DIP
switch settings.
1.
Momentary trigger, no delay
(for timed annunciator or supervisory circuit)
(Fig. 2):
a.
DIP
switch settings:
1 – ON
2 – OFF
3 – ON
4 – Timer setting (ON or OFF)
b.
Action
– If the TRG terminal is connected to (+) momentarily, the relay output
immediately turns on. The output stays on for the time set by the timer, after which it
turns off regardless of whether the trigger is connected or disconnected.
NOTE
– If the momentary trigger time is less than the time set by the timer, the relay
output is triggered only once. If the trigger time is longer than the timer time, the relay
will be activated a second time when the trigger is removed.
c.
N.O. vs. N.C. output
– For a timed door annunciator, connect a buzzer or chime to
the N.O. and COM outputs. For a closed-loop supervisory circuit, connect a dialer or
transmitter to the N.C. and COM outputs.
2.
Momentary trigger, no delay
(for swinger eliminator)
(Fig. 3):
a.
DIP
switch settings:
1 – ON
2 – OFF
3 – ON
4 – Timer setting (ON or OFF)
b.
Action
– If the TRG terminal is connected to (+) momentarily, the relay output
immediately turns on, and stays on for as long as the TRG terminal is connected to
(+). Once the TRG connection is broken, the relay output remain activated for as long
as the time period set by the timer, and then turns off.
c.
Triggering by powering unit up
– If DIP switch #5 is set to ON, the output works the
same, but instead of triggering via the TRG terminal, the SA-025 is triggered by
powering it up. Once powered up, the relay remains activated for the time set by the
timer, or until power is removed, whichever comes first.
3.
One-time 1-sec. momentary trigger, no delay (Fig. 4):
a.
DIP
switch settings:
5 – OFF
6 – OFF
5 – OFF
6 – ON
1 – OFF
2 – OFF
3 – ON
4 – Timer setting (ON or OFF)
5 – OFF
6 – ON
Fig. 2 – Momentary trigger, no delay
Fig. 7 – Optional negative or
closed-circuit trigger
Fig. 6 – Pulse/flash o/p, instant/delay
Fig. 5 – Latched output, delayed
Fig. 4 – 1-time mom. trigger, no delay
Fig. 3 – Momentary trigger, no delay
Note: regarding DIP switch #1:
Sometimes DIP switch #1 will function as an
instant/delay control, but when it is ON, its actual
function depends on how DIP switch #3 is set.
DIP #1 setting
Function
OFF
1-sec. momentary relay output
ON (DIP #3 ON)
Relay output latches on
ON (DIP #3 OFF) Relay output equals 1 sec.
*
*(1K ohm resistor included)
*
