Originally posted by Vangelis
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It was also a bit of a night mare getting the timing right. Signal is sent to open gate, gate light strobe flashes (eu requirement these days) at the same time the solenoid is activated, after 3 seconds the latch is released and the gates open. 30 seconds later power to solenoid is cut and drop bolt drops. This actually keeps the gates locked in the open position (well one of the leaves anyway). And to close the gates it starts with the strobe flashing and the solenoid is activated and then de-activated about 30 seconds later. It actually only takes about 20 to 25 seconds to close or open the gates. But to allow for mechanical frictions, client not greasing the gate hinges etc, 30 seconds gives a safety margin. This was all done just using the lock interface on the gate controller, a few relays and one of those stairway timed relay devices.
Here is the link, they now do other types of solenoid locks.
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