FREUND
MANUAL
15
9.
Additional notes about DC powered Electric Locks
Some electric locks do not come with F
actory installed protection for “kickback voltage” that can
occur when a lock is powered down.
If the lock you are using has no internal protection, we have included an IN4004 Diode for DC
powered locks. The Diode is shown in picture below.
When properly installed this diode
will keep “kickback voltage” localized at the lock.
FOR THESE COMPONENTS TO BE EFFECTIVE IN PROTECTING YOUR EQUIPMENT AGAINST
ELECTRICAL KICKBACK PLEASE FOLLOW THESE INSTRUCTIONS.
For electric locking devices powered with DC voltage
The diode must be installed across the DC powered lock. DC voltage is polarized the diode must
be installed in the direction shown in the illustrations. The side with the silver band must be
connected to the positive leg of power.
IMPORTANT: THE DIODE MUST BE INSTALLED AS CLOSE TO THE LOCK AS POSSIBLE. THE BEST
SCENARIO IS DIRECTLY ACROSS SCREW TERMINALS ON THE LOCK (IF AVAILABLE) AS SHOWN IN
FIGURE 2.
IF THE ELECTRIC LOCK HAS POWER LEADS INSTEAD OF SCREW TERMINALS, SPLICE IT IN PARALLEL
AS SHOWN IN THE EXAMPLE BELOW (FIGURE 3).
