Securitron DT-7 - Manual (Page 4)

PN# 500-11800
Page 4 Rev. C, 02/11
5.1 BLOCK PROGRAMMING
A common requirement is that programmed on/off times will be the same each day during the
week and differ on the weekend. To achieve this result, it is not necessary to program on/off
times separately for each day. Indeed, since there are only a total of 12 instructions, only 6
days can be handled with different on/off times. Block programming is used to handle this
common need, which makes the Prime Time quick and easy to program.
When programming a timer instruction, as you press the day button, you will step through
individual days from Monday through Sunday. Pressing the day button 1 more time will show a
Monday through Friday block. If you leave the instruction in this position it will be executed on
each displayed day. Depressing the day button again will show a Saturday/Sunday block.
Depressing it still another time will show a Monday through Saturday block.
After you have set an instruction, depressing the timer button again will open a new instruction
and enter the previous one. When all instructions have been entered, press the clock symbol
which will again display the time and day of the week. The instructions will now execute until
changed. Instructions can be changed at any time by bringing them up on display and altering
the time and day or erasing the instruction by incrementing it to the horizontal line state.
5.2 TYPICAL PROGRAMMING EXAMPLE
A very common application for the Prime Time is activating and de-activating a security system
at the same time each day during the week and then leaving the security system active over the
weekend. With block programming this is extremely simple. Enter into "timer 1 on" the time
"08:00" assuming for this example that's the time each day you want the system de-activated.
Then enter the Monday through Friday block of days also on "timer 1 on". Then switch to "timer
1 off" and enter "17:00" (5:00 pm) again selecting the Monday through Friday block. At 5:00
p.m. each day this should turn the security system on. No further instructions need be entered
because at 5:00 pm on Friday you want the system to remain on until Monday morning when
the "on" instruction will execute at 8:00 am turning the security system off. If the security
system consists of electric locks, you would use the toggle mode such that when the relay is
energized, the locks are off and visa versa. If the system is an alarm panel using pulsed input,
you would use the double pulse mode. The programming, however, is the same.
We advise that when the display indicates "on" the system should be off. This requires
use of the appropriate relay contacts depending on the type of load and the mode. The reasons
for this have to do with ease of holiday programming and use of the "First Man In" terminals
described in section 6.
5.3 HOLIDAY PROGRAMMING
Having established the weekly block program described above, lets say that a holiday occurs on
a Wednesday during which the security system is to be left on. Normally as the weekly block
program is executed, an 8:00 am "on" instruction will turn the system off. You could of course
void the entire weekly program and put in a daily instruction just to deal with the holiday, but
this is needlessly complicated and requires re-establishing the original program after the holiday.
What's easier is to put in an override command. Leaving the weekly block program intact you
call up "timer 2 off" and put in a command for Wednesday at 8:00 am. This will duplicate the
weekly block program which instructs the Prime Time to turn on Wednesday at 8:00 am and the
off instruction has priority. Therefore, the on instruction will be ignored and all day
Wednesday the security system will stay on. After the holiday, you have only to void out the
single instruction on "timer 2 off".
A more powerful way to deal with holidays that works for many applications is described in the
next section.
6. USE OF FIRST MAN IN TERMINALS
Terminals 3 and 4 are labeled "First Man In". If they are unconnected they have no effect on
operation of the unit as described so far. Connecting them to an external switch or relay can
make operation of the Prime Time more powerful.