ZK S900 - Page 15

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Connecting Door Lock
Although the S900 can supply power directly to a door lock, it is
recommended that the door lock be provided with an independent
power source in certain situations.
Provide an independent power source to the door lock if
:
1) the door lock voltage is not 12V DC;
2) the door lock runs on 12V DC, but requires more than 1.5A current;
-or-
3) the distance between the S900 and door lock is greater than 15 feet.