Securitron DT-7 Installation Instructions

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SECURITRON PRIME TIME MODEL DT-7

INSTALLATION AND OPERATING INSTRUCTIONS

1. DESCRIPTION

Securitron's Prime Time is a daily or weekly digital timer which operates on 12 to 24 volts AC or
DC and energizes and deenergizes a 10 Amp double pole, double throw relay according to
instructions set over a week. Toggle, or 2 types of pulsed relay operation may be selected.

2. POWER UP AND TIME SETTING

Identify terminals 1 and 2 marked "12-24 AC/DC". Apply a voltage source in this range to these
2 terminals. If a substantially greater voltage is applied the unit will be damaged.
Current drawn is 160 mA when the unit's relay is energized and 10 mA when the relay is
deenergized regardless of input voltage. Note that if DC voltage is used for power, polarity is
unimportant.

When power has been applied, the liquid crystal display on the rectangular plastic timer module
will come on showing the word "off" and "0000". The next step is to input the current time of
day into the timer module. To set the time of day, push and hold dow n the button farthest on
the left which shows the clock symbol. While holding this button down, set the hours by
repeatedly pushing the "H+" button. Note that if this button is held down, the hours will
automatically increment. Note also that the unit does not use AM and PM designation for the
hours, but rather employs military time based on a 24 hour system. For example, 22:00 hours
is the same as 10:00 PM.

In similar fashion, set the minutes by depressing the "M+" button while holding down the clock
symbol button. Finally, set the day of the week by pressing the day button while holding down
the clock symbol button. Once the time of day and the day of the wee k have been entered you
can release the clock symbol button.

FIG. 1: PRIME TIME OVERVIEW

BOARD POWER

12-24 VOLTS AC OR DC

CC

DRY, DPDT, 10 AMP RELAY CONTACTS

MISSING, UNIT WILL NOT FUNCTION

1

NONONC

NOTE: IF JUMPER BLOCK IS

2

3

4

NC

FIRST MAN IN TERMINALS

SEE PARAGRAPH 6

Timer

Reset

J1
J2
J3

Day

SELECT TOGGLE MODE

SELECT DOUBLE PULSE MODE

SELECT SINGLE PULSE MODE

h+ m+

OBSERV E PO LARITY

BATTERY CLIP (AA CELL)

BACKS UP DISPLY MOD ULE

© Copyright, 2012, all rights reserved PN# 500-11800
Page 1 Rev. D, 10/12

3. TOGGLE MODE

The toggle mode is selected when the jumper block is set to the "J1" (factory set) position.

Note that if the jumper block is missing, the relay will stay energized all the time and
the unit will not perform any function. In the toggle mode, the Prime Time is programmed

to turn electrical devices on or off at selectable times over a week period. The Prime Time
accomplishes this by energizing or deenergizing a 10 Amp DPDT relay. Note the terminal strip
with 6 terminals marked "C", "NC", and "NO" for each pole. Devices to be controlled by the
Prime Time should be connected to these terminals which are isolated (dry) relay contacts.

Note on the display that the term "off" appears to the left of the hours display. This indicates
that the relay is off or deenergized. Note finally the long push button on the timer module with
a hand symbol printed next to it that is situated below the "H+" and "M+" push buttons.
Pressing this button while the unit is in operating mode (time is showing) will allow you to
manually energize and de-energize the relay. As you do this the display will chan ge from "off"
to "on" and back again. This is useful for testing and for temporarily changing the state of the
relay.

4. PULSE MODES

Moving the jumper block to position "J2" selects the double pulse mode. In this mode, when
the display module executes an "on" or "off" instruction, the relay pulses (energizes) for 1
second and then returns to a deenergized state. This is useful for controlling devices that
require a momentary pulse to turn on and off such as many alarm panels. In the pulse modes,
the test button function and relay connections are the same as in the toggle mode described in
the previous section. As you use the test button, the displa y will change from "on" to "o ff" (and
back), and you will be able to see and hear the relay contacts switching for one second.
Remember, the pulse modes affect what the relay does, not how the display changes.

Moving the jumper block to position "J3" selects the single pulse mode. In this mode, the
relay will pulse when an "on" instruction executes (display changes from "o ff" to "on") but not
when an "off" instruction executes. This allows sending a pulse signal once a week- to test a
dialer for example. When working with any of the modes, liberal use of the test button will
permit easier understanding.

5. PROGRAMMING

To program the on/off times, depress the push button marked "timer" once. This enters the
programming mode. The display will now change and indicate "timer 1 on". Pressing the timer
button again will display "timer 1 off". If you continue to depress the timer butto n, you will step
through 6 "on" timers and 6 "off" timers. These represent a total of 12 program instructions. At
start up, all of the instructions are inactive, which is indi cated by the fact that they do not show
any time or day but merely show horizontal lines. To make any of the 12 instructions active,
you must input an hour, minute, and day by pressing the "H+", "M+" and day buttons just as
you did when you first set the time. If, however, a day of the week is not input, the
instruction will be executed daily. This is how to use the Prime Time to execute the same
program each day.

When an "on" instruction executes in the toggle mode, it will energize the relay on the time and
day selected. In the double or single pulse m ode the relay will energize for 1 seco nd. An "off"
instruction will deenergize the relay in the toggle mode, pulse it in the double pu lse mode and
have no effect in the single pulse mode. If the display is already "on" and an "on" instruction
executes, nothing will happen. Programmed instructions only function when they change the
state of the display. The relay then responds according to the mode selected. All 12 instruct ions
may, if desired, be used during the same day or be spread out throughout the week which is
more common. The fact that the instruction sets are labeled 1 through 6 has no significance.
The instructions will be executed whenever the time and date of the instruction occurs.

It is important to understand how the unit works in terms of executing its program. Think of the
programmed "on" and "off" instructions as markers on a 7 day schedule. Then think of the
digital clock as moving through this 7 day period, minute by minute. When the clock encounters
an instruction, it will execute the instruction by turn ing on or off (if it is not already in the st ate
called for in the instruction). Sometimes, we get the followin g type of qu estion from an installer
on initial set-up: "I put in an 'on' instruction for 8:00 am today. It's now 10:00 am and the

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relay is showing 'off'. Why doesn't it turn on?" The answer is that the DT-7 does not check
what time it is and then look to see if it is "supposed" to be on or off. It just advances its clock,
minute by minute, and when it encounters an instruction, it executes the instruction. On initial
set-up, use the test button to put the unit in the desired initial state.

If an on and off instruction both occur at exactly the same time and day, the off instruction
will be executed and the on instruction will be ignored. An instruction is erased by
incrementing the hours, minutes, and day buttons to restore the horizontal (null) lines. Note
that momentarily pressing the reset detent will eliminate all program data from the unit as well
as eliminating the time setting. The reset detent has the same effect as removing all power
(including the battery) from the unit.

FIG. 2: TIME SETTING AND PROGRAMMING

DISPLAY MODULE: OPERATING MODE AND TIME SETTING

DAY OF WEEK

MODULE STATUS

(ON OR OFF)

HOLD DOWN
TO SET TIME

INCREMENTS DAYS

1 0F 6

INSTRUCTIONS

TO OPERATE RELAY

AT PROGRAMMED

TIME AND DAY

WE

OFF

11:05

Timer

Reset

ERASES TIME

AND PROGRAM

DISPLAY MODULE: PROGRAMMING MODE

TIMER

1 ON

Day h+

TEST BUTTON: MANUALLY

CHANGES MODULE STATUS

16:40

m+

SA SU

TIME OF DAY

INCREMENTS
MINUTES

INCREMENTS
HOURS

BLOCK
INSTRUCTION
FOR SATURDAY

AND SUNDAY

TIME RELAY WILL
OPERATE (4:40 PM)

RETURN TO

Timer

OPERATING MODE

PRESS TO ENTER

PROGRAMMING

MODE AND TO

INCREMENT

INSTRUCTIONS

PN# 500-11800
Page 3 Rev. D, 10/12

Reset

INCREMENTS DAYS AND

CALLS UP BLOCK PROGRAMMING

Day

h+ m+

INCREMENTS
MINUTES

INCREMENTS
HOURS

5.1 BLOCK PROGRAMMING

A common requirement is that programmed on/off times will be the same each d ay 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 sym bol
which will again display the time and day of the week. The instruction s 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 t he security system a ctive 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-activa ted.
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 se lecting 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 th at 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 wi ll turn the system off. You could of course
void the entire weekly program and put in a daily instruction just to deal with the holida y, but
this is needlessly complicated and requires re-esta blishing 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 Tim e to turn o n Wednesd ay 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.

PN# 500-11800
Page 4 Rev. D, 10/12

The best way to understand this feature is to use an application as an example. Returning to
our example cited in section 5.3, a security system deactivates at 08:00 each morning and
resecures at 17:00 hrs. Suppose everyone's la te to work one day because (for in stance) of bad
weather. The facility will be completely unprotected. A better way to operate would be for the
first man to arrive each morning to deactivate the system for the day after which it
automatically reactivates at the end of the day. This is accomplished by connecting dry N.C.
contacts from an external device, to the First Man In terminals (3 and 4). This pu ts the Prime
Time into First Man In mode. When the unit executes an "on" instruction, the output relay
does not operate until the contacts on 3 and 4 open once. When they open, the relay
follows the "on" program which means energizing in the toggle mode or pulsing 1 second in the
double pulse mode. The First Man In terminals do not have any effect in the single pulse mode.
Subsequent state changes of the contacts on 3 and 4 have no further effect on the relay during
the time the display module is "on". When an "off" instruction executes, the state of the First
Man In terminals again have no effect. They act only to delay the operation of an "on"
instruction.

Returning to our example, let's say the security system consists of an electric lock with digital
keypad for entry. The Prime Time is used in the toggle mode. At night, the display module
reads "off" and power is sent to the electric lock to secure it through the Prime Time's outpu t
relay's N.C. contacts. One pole of the digital keypad's output relay will break power to the
electric lock allowing nighttime entry and the other pole's N.C. contacts connect to the First Man
In terminals of the Prime Time. If someone com es to work at 07:45 am, the Prime Time is stil l
"off" so they use the digital keypad for entry. When 08:00 comes, the display module switches
to "on" but the operation of the Prime Time output relay is delayed because of the closure
across the First Man In terminals from the keypad. When another man arrives at 08:10,
he also uses the digital keypad and with this first operation (after 8:00 am), the Prim e Time's
relay energizes and releases the lock so that all subsequent people can freely use the door
during the day. At 17:00 the unit goes into nighttime mode (off) and deenergizes the relay.
The same results can be obtained in the double pulse mode. The pulse that would occur when
an "on" instruction first executes is delayed until the first man in terminals open.

In addition to avoiding leaving a facility unprotected in the event that employees are late to
arrive, the First Man In feature can eliminate the need for holiday programming.
Returning to our example, if we define a holiday as a day no one comes to work, no one will use
the digital keypad so the electric lock will remain secure all day. When the display module
switches to "off" at the end of the holiday, the lock will simply continue secure an d then resume
its normal non-holiday operation the following day. If a particular manager comes to work on
the holiday with this operational concept, he can either leave the lock unsecured all day while he
is there, or change the display module from "on" to "off" by pressing the test button. This action
will resecure the lock. When the 17:00 "off" instruction seeks to execute, the unit will already
be off, so the lock will remain secure during the night as it should.

7. WIRING

Figure 3 shows three "typical" examples of wiring the Prime Time in actual applications. The
first drawing shows the most common use which is simply to swit ch a device or system on and
off in toggle mode. The second drawing shows use of the pulse mode in the most common
security industry application: that of arming and disarming an alarm pan el. Note that there is a
risk in using this set-up in that if the alarm panel is not in the "ready to arm" condition, the
pulse from the Prime Time will not arm the panel. When the next com mand comes up and the
panel should be disarmed, the panel will interpret the next pulse as another attempt to arm.
Therefore, the Prime Time should only be used to arm and disarm alarm panels in applications
where either they are always "ready to arm" or there is some monitoring which will quickly
detect the fact that there has been a failure to arm.

The third drawing shows the particular application example discu ssed in section 6 on use of the
First Man In feature with an electric lock and DPDT digital entry keypad. It is intended to display
the general principle as, obviously, other applications are possible. Finally note that the Prime
Time relay is a socket mount. If the relay is damaged from a load short circuit (for instance) it
can be replaced by simply plugging in a new relay. Replacement relays are available from
Securitron or locally from an electric product wholesaler. The relay part number is LY2-DC6 as
manufactured by Omron Electronics. If an Omron part is not available, the equivalent cross

PN# 500-11800
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from other manufacturers will work (be sure to specify a 6 volt DC coil). This relay physical type
is very common.

FIG. 3: PRIME TIME WIRING EXAMPLES

TYPICAL WIRING: TOGGLE MODE

POWER SUPPLY
12-24 AC/DC

1

2

PRIME
TIME

NO

TYPICAL WIRING : DOUBLE PULSE MODE

USE WITH ALARM PANEL SHOWN

POWER SUPPLY
12-24 AC/DC

1234

PRIME
TIME

LOAD

34

CCNCNC

NO

CCNCNC NONO

NOTE: JUMPER BLOCK SET TO

J1

NOTE: LOAD USES SAME POWER AS DT-7.
IF LOAD REQUIRES DIFFERENT POWER,
SUCH AS 115 VAC, RELAY CONTACTS
SHOULD BE ISOLATED FROM DT-7 POWER.

NOTE: JUMPER BLOCKSET TO J2
PANEL ARMS AND DISARMS AS DISPLAY

MODULE SWITCHES ON AND OFF

ALARM PANEL

KEYSWITCH

(ARM) INPUT

TYPICAL WIRING: TOGGLE MODE WITH FIRST MAN IN ACTIVE

USE WITH ELECTRIC LOCK AND DIGITAL KEYPAD FOR TIME CONTROLLED ENTRY SHOWN

POWER SUPPLY

NOTE: JUMPER

12-24 AC/DC

BLOCK SET TO J1

123

4

C

NC

PRIME

POSSIBLE SHUNT
OF DOOR CONTACTS
CONNECTED TO
ALARM SYSTEM

TIME

NC

C

CC

NC

NONO

DOUBLE POLE KEYPAD

NC

FAIL SAFE
ELECTRIC LOCK

OUTPUT RELAY.
OPERATES WHEN CODE
IS COMPOSED.

NOTE: SEE PARAGRAPH 6 IN INSTRUCTIONS FOR FULL EXPLANATION OF FIRST MAN IN FUNCTION

PN# 500-11800
Page 6 Rev. D, 10/12

8. DAYLIGHT SAVINGS TIME

When the time changes twice a year to and from Daylight Savings Time, the time in the unit
must be adjusted as with any clock. See section 2. for time setting.

9. POWER FAILURE CONSIDERATIONS

If power is removed from the Prime Time, it will lose both the time and its prog ramming an d will
have to be set up again from the beginning. In a DC application this can be forestalled by using
a DC power supply with its own battery backup to operate the Prime Time. This will not only
allow the Prime Time to operate in the event of a power failure, but will operate th e DC loads as
well.

If the Prime Time is to be operated on non-battery backed up external power, an AA cell may b e
added to the board in the space provided. Be sure to observe polarity. The AA cell backs
up the display module only. In the event of an external power failure, the Prime Time's relay
will not operate but the display module will retain the time and date as well as its programming.
The average commercially available AA cell should last at least 5 years in this application.

10. MAGNACARE LIFETIME REPLACEMENT WARRANTY

For warranty information visit www.securitron.com/en/site/securitron/About/MagnaCare-Warranty/

PN# 500-11800

Page 7 Rev. D, 10/12