How to wire a delay.

This may help you to understand time delay relays. The first example (NOTC) shows what you would be interested in.

You'd need to post an example for specifics.

You have 3v+ from the button, so you need a 3v delay relay added to the bridge side triggered by 3v. The buttonn starts both item#1 and the delay  relay for item#2. The input on the realy gets the 3v+. The load rating is how much powers the relay can safely switch (e.g. 12v 3a....3v 1a.....etc.

A module requiring very low amps(ma) at 3v to trigger it is ideal since you don't really know whats driving the 3v signal.

The load connection on the relay will get 3+ (or neg...visa/versa)

Forrest Jerome posted:

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I also have the Ott Machines sound board for the bridge. It also uses 14v accessory power and is triggered by a momentary 3v signal.

Are you sure about the trigger to the sound board?

Here are the Ott instructions from your earlier thread.

Rather than a "momentary" trigger, I interpret the instructions the 8 sec warning siren followed by the lifting sound requires the continuous application of motor voltage to the Ott trigger input.  Apparently when the motor voltage vanishes, the Ott board plays some kind of end-of-travel sound as if the bridge is locking into place or whatever.

While the Ott may trigger on "only" 3V (where did you find this info?), how many volts does the bridge electronics send to motor?  The bridge instructions suggests a power source of 12-18V AC.  I would think the motor voltage would be much higher than 3V.  Is it a DC motor?  Is the voltage always of one DC polarity (motor rotates same direction when raising or lowering)?

I suspect the Ott instructions were written for the original bridge, which I also suspect had different electrical connection configuration. 

Susan wired her board into the works inside the bridge, but still gets simultaneous operation of board and bridge. 

I see nothing in the board or bridge that would delay bridge operation until the warning siren has finished  

Bridge motor does operate at 14v AC. THE 3v trigger is what the bridge is supplying. Not sure if the board would work with something different (probably), but it does trigger with 3v. 

Forrest Jerome posted:

Bridge motor does operate at 14v AC..

Rather than playing 20 questions here's a generic $4 solution to delaying 14V AC by 8 seconds.  No soldering, no fussing with individual components, diodes, resistors, etc.

The first module converts 14V AC to 12V DC.  You need a meter to set the voltage. 

The 2nd module receives 12V DC, waits 8 seconds and closes its relay.  The relay delays 14V AC to the motor.  As soon as 14V AC power is lost, both modules turn off and the motor instantly loses power.  End result: 8 seconds delay to turn ON, 0 seconds delay to turn OFF.