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6.2. Dip switch positions
In addition to running the necessary wires for the desired mode, positioning the three dip switches located on the
lock printed circuit board determines the operation. These are accessed by removing the cover.
MARKINGS S1, S2 AND M ARE FOUND ON THE PRINTED CIRCUIT BOARD.
Switches S1 and S2 are used to set the timed re-lock. If an unlock signal is given to the lock but the door is not
opened the YD25K can automatically lock itself again after a selected time. This ensures that a door cannot be left
unsecured if it has been unlocked but not opened. The timer is factory set to 9 seconds but 0, 3, and 6 second
options are offered and selected by positioning the dip switches accordingly.
Switch M is used to select fail safe or fail secure mode. This is factory set as ordered and should not need to
be moved.
TIMED RELOCK
SWITCH POSITIONS
MODE
3 WIRE MODE
2 WIRE MODE
7. OPERATION
7.1. Three wire mode (Recommended)
In either fail safe or fail secure configuration, maintained connection of '1' to '2' will keep the YD25K unlocked
regardless of the door position. The following scenarios assume that the control signal is open at the start of the
operation sequence as a maintained connection will cause the lock to stay unlocked indefinitely.
7.1.1. Fail safe operation
Assume the door is closed and locked. Momentarily connecting '1' and '2' unlocks the door for a period of 9 seconds.
After the 9 seconds has elapsed if the door has not been opened the YD25K automatically locks again. If the door
has opened within the 9 second window (which is the case in normal operation) the timed re-lock is overridden and
automatic relocking occurs as soon as the door is closed. On closing, full power is applied to the YD25K 9 times in
15 seconds before the current is reduced and the lock goes into a holding mode to minimize heating and power
consumption. The YD25K will remain unlocked as long as the door is open.
7.1.2. Fail secure operation
Assume the door is closed and locked. Momentarily connecting '1' and '2' unlocks the door and over a 9 second
period full power is applied to the lock 5 times. If the door remains closed, after 9 seconds has elapsed the YD25K
automatically locks again. If the door has opened within the 9 second window (which is the case in normal operation)
the YD25K will remain unlocked and in a holding mode until the door is closed again and automatic re-locking occurs.
7.2. Two wire mode
In installations where running three wires to the lock is not possible or desired the YD25K can operate effectively on
two wires. Although the functions are reduced, as seen in the table below, controlling the lock this way still offers a
high security locking solution.
Multiple re-lock
FEATURES
3 WIRE MODE
2 WIRE MODE
0 second
S1 On & S2 On
Fail Safe
M Off
N/A
Multiple unlock
(fail safe)
(fail secure)
Yes 9x
Yes 5x
Yes 5x
Yes 5x
3 second
S1 Off & S2 On
S1 On & S2 Off
Auto re-lock
Yes
N/A
6 second
9 seconds - default
S1 Off & S2 Off
Fail Secure
M On
M On
Adjustable timed
Anti-Tamper
Yes
Yes
re-lock
Yes
No
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