Needing some advice on ceiling mounted projection screens

5 Replies

Needing some advice on ceiling mounted projection screens

Posted by Chance Haugen on Jul 16, 2018 2:39 pm

Good afternoon all,
Here at West Texas A&M University, one of our banquet spaces is older and has older presentation equipment in the room.  In our effort to update the space and make the technology in the space somewhat updated, we installed new HD projectors in the space and adjusted the 4:3 screen to "look" 16:9.  Essentially we raised the stopping point for the screens to make it look like we had widescreen screens when it fact the screens were originally 4:3.  I know that it isn't the best option but in the world of trying to make due with what we had, we went that way.

The problem now is that one of the screens seems to have a mind of its own and extends past the set stopping point.  Does anyone have any ideas on why that is happening?  It's not the end of the world to fix it but I'd like to see if anyone has experienced this behavior.

Thank you for your input,

Chance Haugen
West Texas A&M University
chaugen@wtamu.edu
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Re: Needing some advice on ceiling mounted projection screens

Posted by Stephen Snipes on Jul 17, 2018 8:48 am

Chance,

You may just need to reset the stopping point again.  We had a screen do the same and we reset it and it has been working fine.  We also use Crestron to control our screens coming down so that may have something to do with ours.

Re: Needing some advice on ceiling mounted projection screens

Posted by Brent Sutphin on Jul 17, 2018 9:16 am

What brand/model of motorized screens are you adjusting? I've had issues with this before and it mostly just took time adjusting the limit switches. 

Re: Needing some advice on ceiling mounted projection screens

Posted by Eric Johnson on Jul 19, 2018 2:19 pm

Hello Chance:  On rare occasion the limit switch in the roller motor control box breaks and needs to be replaced.  Open the box at the motor and see if it has just skipped out and can be reset. If not, then order a replacement part and have an AV provider do the install. If you happen to have someone in-house that can change it out and adjust it, you can save a few hundred dollars.  Good luck on the repair.    Eric Johnson   University and Student Centers, University of Texas Arlington

Re: Needing some advice on ceiling mounted projection screens

Posted by Chris Jensen on Jul 20, 2018 12:19 am

Hi Chance,

There are different systems out there for travel limit.  I would bet that even though the limit adjusted you might have over used the limit screw range.  Typically you spec a screen with an amount of leader at the top so that the focal point drops in where you want it.  Sure you can alter that but you would still be leaving screen on the roller.  By leaving a good amount of material on the roller you might have a malfunction in the limit system.  I have seen tensioned screens installed to trim at different heights to make ratios although they never work well as you need to have the curve on the screen mature for it to work right.  

Without seeing your set up and heights it's hard to know exactly what you are dealing with.  I have seen far better success with masking kits instead of using the screen motor to limit travel.  For instance, if you have a tall space and want to cut the height, instead shorting how much unrolls, maybe it is wold be better to set up a short pipe and drape kit from the bottom on the floor.  You will still get a finished look at the top this way.

Again not know the space so sorry if this won't help, if in theater type setting with any flyable curtains you can bring in a boarder to mask from the top so the screen is still being used within its normal range.

That last thing I will mention is that there are some neat motors out there that have more sophisticated limiting systems.  Da Lite has a system now that is mated to the material and calibrated based on motor turns so that it is measuring the amount of screen you have unrolled.  You create set point and then recall them instead of relying on the physical limit screw that fall out of adjustment.

Re: Needing some advice on ceiling mounted projection screens

Posted by Chance Haugen on Jul 21, 2018 9:32 am

Sorry for the delay in getting back with you all. Thank you for the advice. over the last week, we had a tech here doing the programming for the creatron system. The entire system and it looks and works so much better. We will see how the new programming helps or hurts the screen adjustment. 

The screens are Draper screens. They are screens that are at least 15 years old. They are not self tensioning. as far as the space goes, it’s a banquet space. The screens are at the House left and right of the room. We have done the route of having ground support screens and it just gets really inconvenient with the different uses of the room and having to move the screens all the time. 

I dont really like having to ask about the screens because I know the better answer is to just replace the dang things but our budget just doesnt support that right now. 

I had our techs adjust the screens again but I’ll next time I’ll go look at the adjustment setup to see if they are broken. 

Thank you for your input. I’ll go look at the adjustment setup to see if that is the problem.