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DIGITAL COUNTDOWN
TIMER / ABORT STATION
Graphic Annunciators * Water Leak Detection
Fireman’s Smoke Control Panels * ARA Systems
109 Portwatch Way Wilmington, N.C. 28412 Phone: (800) 251-2512 Fax: (800) 251-9878
Internet: www.ledinc.com Email: sales@ledinc.com
Features
Adaptable to most 12-24VDC control
units.
Low standby current consumption.
Rugged solid-state construction.
Large .8 inch LED back-lit digital readout.
TA
SERIES
Precision quartz crystal referenced 1
second incremental countdown.
Field programmable for Seconds, or
Minutes and Seconds countdown.
Field programmable for desired delay
from 1-99 seconds or 1 second to 99
minutes 59 seconds.
On-board selectable Sonalert counts time
“ticks” in 1 second intervals and signals
continuously when time reaches 0.
Description
The TA-123 features a built-in springloaded dead-man 1 3/4” mushroom abort
switch. Unit mounts on a three-gang
switch box.
The T-123 features the display unit only. It
is intended to be installed in a graphic
annunciator panel or other enclosure.
Model TA-123
Specifications
Input: 24 vdc, Filtered & Regulated
Standby: 155ma
Activated: 175ma
Easily programmed to:
1. Reset to original time when ABORT is
depressed.
2. Reset to original time when ABORT is
depressed unless time left is less than
10 seconds, in which case resets to 10
seconds (jumper option)
3. Halt (stop time) when ABORT is
depressed.
4. Count down to 10 seconds and hold
when ABORT is depressed.
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TA
SERIES
DIGITAL COUNTDOWN
TIMER / ABORT STATION
2ND ZONE CONTACT
PANEL OPERATED
ABORT CONTACT
IMPUT
ABORT ZONE
24vdc
POWER INPUT
+
-
RESET
HALT
SINGLE
ABORT
+
-
1 2 3
TRIG
RESET
HALT
GND
LOAD+
LOAD-
J2
Shown
}
Enabled
J3
+
-
TRIG
ABORT
HALT
GND
LOAD+
LOAD-
MULTIPLE
ABORTS
+
-
HOOKUP DIAGRAMS FOR
SINGLE AND MULTIPLE
TIMER/ABORT STATIONS
TRIG
ABORT
HALT
GND
LOAD+
LOAD-
Operation
The digital countdown timer is activated by contact closure and requires 24VDC power (filtered and regulated power recommended but not required).
Panel operated ABORT contact may be connected to either reset or halt time.
The digital countdown timer uses its own internal clock and must be programmed to coincide with the time delay on the
control panel that powers it. Its use is for the reference of the time remaining between the start and finish of the suppression
system control unit time delay period. It is not an integral part of the suppression system control unit and does not affect the
control unit time delay settings. Load terminals may not be parallel linked. Each load is only capable of triggering its own,
independant load.
Time Setting Switches
Switches S1 - S4 are used to set the initial count down time of the TA-123. Each is set to the digit of the initial count in the
format of MM:SS where MM is the minutes to count and SS is the seconds to count. You may set minutes to count on S1
and S2 (S1 is 19 min and S2 is 1 min) from 0 to 99 minutes. S3 and S4 set the seconds to count from 0 to 59 seconds. If
S1 and S2 are set to 00 minutes then S3 and S4 may be set from 0 to 99 seconds.
Optional Jumpers & Wiring
J2 - Sonalert Enable. When enabled, the sonalert beeps once each second while the TA-123B is counting down. When the
count reaches 00:00 the sonalert changes from a beep to a solid tone until the trigger signal is removed.
J3 changes the RESET and HALT to respond to some 3rd part requirements. When J3 is not enabled, RESET will stop the
count, and when released, reset to the S1-S4 initial count time. When enabled, RESET will respond the same UNLESS the
count is at 10 seconds or less. When the count is 10 seconds or less, RESET will cause the count to stop and resume at 10
seconds when released. When J3 is enabled, HALT will count down UNTIL the count reaches 10 seconds at which point it
will hold. After HALT is released, the count will resume as normal from 10 seconds.
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