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what are the consequences of cutting power off without turning off?

thevesel

By thevesel
in Video & Projection

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thevesel Part-timer

thevesel

Posted
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Soon I need to use few projectors in a specific way for the first time: Project them only the first 10 minutes of a show. They are decent projectors, Hitachi CP-X5022 ,but the issue is when trying to power it off by remote it shows a confirmation text. To not ruin the mood of the show I don't want that. My only option is to either have it on but display "nothing" for the rest of the show which is several hours and waste lamp life, or cut the power off so that text won't show up. I've heard bumping the projector after doing that can damage the lamp which won't happen because of where it is, but other than that is there anything else that can and does happen when you do that I should be aware of? What I usually do is cover the lens by some sheet when turning it off so the text wont be visible but this time its out of reach.

 

 

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DrV Mentor

DrV

Posted
Posted
A remote controlled shutter (DMX if you are running lighting too) would surely be the answer.
IRW Mentor

IRW

Posted
Posted

Soon I need to use few projectors in a specific way for the first time: Project them only the first 10 minutes of a show. They are decent projectors, Hitachi CP-X5022 ,but the issue is when trying to power it off by remote it shows a confirmation text. To not ruin the mood of the show I don't want that. My only option is to either have it on but display "nothing" for the rest of the show which is several hours and waste lamp life, or cut the power off so that text won't show up. I've heard bumping the projector after doing that can damage the lamp which won't happen because of where it is, but other than that is there anything else that can and does happen when you do that I should be aware of? What I usually do is cover the lens by some sheet when turning it off so the text wont be visible but this time its out of reach.

 

 

 

Can you control those projectors via serial, or a browser-based interface? These sort of control interfaces usually don't throw up a confirmation message

Ynot Production Manager

Ynot

Posted
Posted

To actually answer the question posed by the OP...

 

The correct method of powering down the vast majority, if not all, projectors is to use the stand-by command, either by remote control (which yes will result in the confirmation text) or the network option (which usually doesn't, but CAN do depending on the model).

The reason for this is that whilst that douses the lamp, the cooling fan(s) will continue to run until the lamphouse temperature drops to the appropriate level, after which the whole machine goes into standby.

Cutting power to the machine completely means that NONE of that takes place, and there can be a certain amount of shock experienced by the lamp which WILL shorten its overall lifespan, and in some cases could cause it to blow, either at that stage or when it is re-powered.

The same principle is used on many discharge moving heads for exactly the same reasons.

AxlD1234 Apprentice

AxlD1234

Posted
Posted
Another option. Would you be able to have someone physically access the projector during the show? if so have someone go up there. Put a piece of paper, or cloth in front of the lens and turn off the power after that?
gyro_gearloose Mentor

gyro_gearloose

Posted
Posted
Cutting power to the machine completely means that NONE of that takes place, and there can be a certain amount of shock experienced by the lamp which WILL shorten its overall lifespan,

How does his work? Surely by cutting power to the lamp and then forcing air over it will force it to cool down faster than it otherwise would? Isn't there the outside possibility that this can shorten the lamp life, as opposed to letting the lamp cool down by itself? As the lamp is off you aren't going to make the projector get hotter by not putting the fans on as no more energy is being introduced in to the system.

adamharman Supervisor

adamharman

Posted
Posted

Surely by cutting power to the lamp and then forcing air over it will force it to cool down faster than it otherwise would? Isn't there the outside possibility that this can shorten the lamp life, as opposed to letting the lamp cool down by itself? As the lamp is off you aren't going to make the projector get hotter by not putting the fans on as no more energy is being introduced in to the system.

 

I think the issue is that the lamp is still extremely hot, and removing the forced are cooling allows localised hot spots which can weaken the glass bulb.

timsabre Production Manager

timsabre

Posted
Posted

Surely by cutting power to the lamp and then forcing air over it will force it to cool down faster than it otherwise would? Isn't there the outside possibility that this can shorten the lamp life, as opposed to letting the lamp cool down by itself? As the lamp is off you aren't going to make the projector get hotter by not putting the fans on as no more energy is being introduced in to the system.

 

I think the issue is that the lamp is still extremely hot, and removing the forced are cooling allows localised hot spots which can weaken the glass bulb.

 

It's not just the lamp, it's also the projector housing - if you pull the power there is a lot of heat there which suddenly is not getting removed by the fans. So the lamp temperature will rise sharply for a short time, as will the projector housing around the lamp. This is not good for any of the parts...

Shez Production Manager

Shez

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Posted
+1 for the network option - I have at least 30 Hitachi projectors here and can remotely switch them all off at the click of a mouse without any confirmation messages. It's easy and it's free.
Dave m Mentor

Dave m

Posted
Posted

+1 for a shutter. Easy enough to make your own if you have to using r/c model servos.

 

 

or an old CD drive from a PC

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