Securitron DK-26 User Manual download pdf (Page 16)

PN# 500-16900

Page 15 Rev. D, 12/11

don’t violate egress building codes when employing a keypad on the inside of a door.

Check with your local building or fire department.

7.2 HARDWIRED CODE DISABLING

This means making a switch connection to the CPU board which will cause valid codes to not be

accepted. The DK-26 has two terminals marked “HCD” and “UCD” which will respectively

disable the Hard code and all User codes. Simply connect the SRC terminal to either of

these terminals via an external switch and the respective codes will not function while the switch

is closed. Alternately if you supply +12V or +24V from the DC+ terminal to either of these

terminals, it will have the same effect.

The main reason for doing this is to support

day/night operations. For example, you could

allow all User codes to be active during the day

but disable them at night by closing a switch

between SRC and UCD. The Hard code would be

the only method of entry at night. Or, you could

have no Hard code programmed so that there

would be no entry at night. This could be done by

timer controlled contacts from a timer such as

Securitron’s model DT-7. It’s finally possible to flip the codes (Hard and all User) so that, for

example, User codes are active only during the day and the Hard code is active only at night.

An SPDT switch or relay is needed to do this as the drawing to the right shows. Note that you

won’t be able to use one of these disabling features (Hard or User) if you have implemented the

door prop alarm (Section 6.4) or anti-tailgating (Section 7.4) features. These reassign one of

the terminals.

7.3 ALARM SYSTEM SHUNTING

The DK-26's lock control relay is of the double pole, double throw type. Note that in all the

other drawings in this manual, we show only one of the poles being used (C1, NC1 and NO1).

The most common use for the second pole (C2, NC2 and NO2) is to shunt out an alarm

system, which would be connected to the door when the DK-26 is being utilized. The idea is

that if the door opens without the DK-26 having been activated, an alarm signal should result.

When the DK-26 is employed to open the door, the alarm signal should be shunted.

The alarm system will be connected to a door switch or other detector at the door via two wires.

You will need to determine if this “loop” is closed when the door is closed and opens when the

door opens (the most common) or is open when the door is closed and closes when the door

opens. In the former case (closed when the door is closed), splice wires respectively from C2

and NO2 into the wires from the detector or switch. When the DK-26 operates, this connection

will close preventing the alarm loop from opening (alarm condition). In the latter case (open

when the door is closed), cut one of the alarm loop wires and splice wires respectively from C2

and NC2 into the ends of this wire. When the DK-26 operates, this connection will open

preventing the alarm loop from closing (alarm condition).

FIG 8 WIRING TO SHUNT ALARM SYSTEM ON DOOR

NC2 C2

NO2

DOOR

SWITCH

NC2 C2

NO2

DOOR

SWITCH

ALARM SIGNAL WHICH IS

CLOSED WHEN DOOR IS CLOSED;

OPENS TO ALARM

ALARM SIGNAL WHICH IS

OPEN WHEN DOOR IS CLOSED;

CLOSES TO ALARM

CUT EITHER

WIRE FROM

SWITCH

TO ALARM PANEL TO ALARM PANEL

SRC

REX UCD HCD

SPDT

SWITCH

OR RELAY

WITH THE CONTACTS

AS SHOWN, THE HARD

CODE IS DISABLED.

WHEN THEY SWITCH,

ALL USER CODES

WILL BE DISABLED.

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