PN# 500-16900
Page 5
Rev. D, 12/11
the lock. DC locks operated in this way must not draw more than 2 Amps. The positive
DC terminal connects to the common of relay #1 and either the NO1 terminal (if the lock is fail
secure) or the NC1 terminal (if the lock is fail safe) connects to the lock’s positive power input.
This is shown in dotted lines. You only connect one of these terminals. Note that some DC locks
are polarized and you must connect lock power correctly to positive and negative. Others are
not polarized and can be connected either way. Consult the lock instructions.
FIG. 4: DC LOCK - AC POWER WIRING
NC1
C1
NO1
A
C
IN
F
D
C
I
N
/O
U
T
+
TRANSFORMER
12 OR 24 VAC
DC FAIL SECURE
OR FAIL SAFE LOCK
MOV
IF FAIL SECURE
IF FAIL SAFE
NOTE: MOV NOT REQUIRED IF
SECURITRON MAGNALOCK IS USED
+
3.3.3 DC LOCK WITH DC POWER
Select a power supply of the same voltage as the lock (12 or 24). Make sure the capacity of the
supply is large enough to operate both the DK-26 and the lock. The DK-26 does not require
regulated power but certain specialized electric locks do, so follow the rule of matching the
power supply to the requirements of the lock.
DC locks come in “fail secure” and “fail safe” versions. A fail secure lock is secure when not
powered and a fail safe lock is secure when powered. All magnetic locks are fail safe. Figure 5
shows correct wiring. The positive DC terminal connects to the common of relay #1 and either
the NO1 terminal (if the lock is fail secure) or the NC1 terminal (if the lock is fail safe) connects
to the lock’s positive power input. This is shown in dotted lines. You only connect one of these
two terminals. Note that some DC locks are polarized and you must be sure to connect the lock
power wires correctly to positive and negative. Others are not polarized and it doesn’t matter
which way they are connected. Consult the lock instructions.
FIG 5: DC LOCK - DC POWER WIRING
NC1
C1
NO1
AC
IN
F
DC I
N
/
O
UT
+
POWER SUPPLY
12 OR 24 VDC
DC FAIL SECURE
OR FAIL SAFE LOCK
MOV
IF FAIL SECURE
IF FAIL SAFE
NOTE: MOV NOT REQUIRED IF
SECURITRON MAGNALOCK IS USED
+
+
DC POWER NEED NOT
BE REGULATED
Summary of Contents for Securitron DK-26
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