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This topic comprises 2 pages: 1 2
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Topic: MDI Masking-Curtain Control
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Martin Tremblay
Film Handler
Posts: 2
From: Joliette, Quebec, Canada
Registered: Apr 2001
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posted 04-09-2001 08:07 AM
Hi,I am working for MDI and I will try to help you with your motor. 1- It would be interesting maybe for you to call MDI when you have a problem with a motor. (450)755-3795 ask for me. 2- When you say your motor loses its positions, what exactly happens? 3- Is there any remote plugged to your motor? Normally we do not encounter such problems but it is always possible that your motor may be defective or that the power is not so clean so be sure to have a clean AC. Remember that the MDI motors use a non volatile memory so even with no power it would take about 40 years for the memory to fail.
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Martin Tremblay
Film Handler
Posts: 2
From: Joliette, Quebec, Canada
Registered: Apr 2001
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posted 04-10-2001 08:26 AM
Mr McLeod,MDI uses in its drives the Microchip memory IC #24C01 wich is guaranteed br Microchip to hold its data for over 40 years.(Non volatile memory databook 1995 page 3-105). You can encounter some problems if your AC is bad; I have seen some theaters that returned me several units have 120 Vac on the motor at rest but as soon as it was activated the AC fell to 70V.(Saw that only when I had to go there). You may loose your settings, if the motor is activated while there is a drop or a significant amount of noise in your AC; only then you may lose your settings. I will add, we are working on our motors to have a detection of lower AC, a checksum on the positions, a self check on power loss so the motor will resume to the position it had been asked to go and EMI filtering (optionnal). All that in our new series of masking motors that will be out soon. We have several thousand units all over the world that are working fine; yes there are some improvements to be done but we're on it!
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Leo Enticknap
Film God
Posts: 7474
From: Loma Linda, CA
Registered: Jul 2000
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posted 05-13-2016 01:33 PM
Just over fifteen years and a complete new software system for the AMX touch panel system that drives it later, I'm still having the same issue with this masking system at the Egyptian. The presets still wander, and #7 on the bottom doesn't work at all (it just goes to the extreme end if you call it, even after saving a position).
I think Mr. Tremblay could be onto something with the a/c. When the air handling unit kicks in, the worklights in the booth do dim momentarily. Presumably the motor start capacitors are sucking enough power to knock down the voltage somewhat, and if the masking control boards are that sensitive to a drop in line voltage, this could be behind it.
The positions wander enough such that for the more commonly used presets (1.37, 1.78, 1.85 and 'scope are the ones we use very frequently), I have to re-do them roughly every month. For the lesser used ones (e.g. Movietone, 1.66 and 70mm 2.20), it's before every show.
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