Film-Tech Forum ARCHIVE: Help with Cooperator and curtain controls

This is topic Help with Cooperator and curtain controls in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by Bernie Anderson Jr (Member # 410) on 04-12-2008, 02:44 PM:

Hi Guys,

I'm working with a Eprad Cooperator and I'm trying to hook up a curtain control using a DPDT solenoid switch. The switching of the curtain will work fine, but what I need to do is power a 24vac solenoid (coil) using the inboard cue. At terminals 21 & 22 there is no 24v and I'm getting around 5v across the terminals and 0 when the cue goes through. Again, my only problem is I just need to energize the coil through the inboard cue foil. Any suggestions?

Thanks

Bernie

Posted by Mark Gulbrandsen (Member # 72) on 04-12-2008, 06:03 PM:

You could use a small 5 volt DIP relay to be operated by the inboard cue and that in turn would operate the larger curtain solenoid. What ever you end up doing it will probably have to be one or two extra relays before the curtain relay.

Mark

Posted by Rick Raskin (Member # 1561) on 04-12-2008, 06:12 PM:

Mark,

I was thinking the same thing. But wouldn't the 5V relay be energized most of the time and only de-energize when the cue foil is detected? I would think you would want the opposite behavior. You could use a relay with a set of contacts that close when the relay de-energizes, but I'd be concerned about the effect constant current in the relay coil.

Posted by Bernie Anderson Jr (Member # 410) on 04-12-2008, 06:18 PM:

I was thinking the same thing, but was hoping that I could get away thing something else.

Posted by Bernie Anderson Jr (Member # 410) on 04-14-2008, 09:13 PM:

Since I'm not relying on the automation for any curtain control (the curtain would only be controlled by a cue), can I just take the inboard cue out of the automation wiring and wire it directly to the coil via a transformer and relay? What's the voltage at the cue sensor? Any suggestions?