8mm Forum: Elmo GS1200 great condition $850.00

This is topic Elmo GS1200 great condition $850.00 in forum 8mm equipment for sale/trade at 8mm Forum.

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Posted by Julie Smith (Member # 4682) on February 08, 2015, 07:03 PM:

I have an Elmo GS 1200 for sale, it is from Germany so I bought a step up step down transformer to make sure I could run it. Everything is in good working order, it has the original manual (in German) and has been well cared for. I am wanting putting it on here before Ebay and I want $850.00..please email me with any questions and I will provide pictures, videos etc, Thank you
I think I posted on the incorrect blog new to me so not paying enough attention !!!

Posted by Douglas Meltzer (Member # 28) on February 08, 2015, 08:24 PM:

Julie,

I deleted the other posting. Best of luck on your sale!

Doug

Posted by Julie Smith (Member # 4682) on February 09, 2015, 06:34 AM:

Thank you

Posted by Pete Richards (Member # 2203) on February 24, 2015, 06:35 PM:

Would you be interested in shipping to Australia?

Posted by Gus Mikszan (Member # 4805) on April 16, 2015, 05:38 PM:

Just curious how the step down transformer worked out for you? Does the projector support 60 Hz operation? I am weary of units that were made for 50 Hz specifically as the motor will probably change speed if powered at the wrong frequency.

Posted by Maurizio Di Cintio (Member # 144) on April 17, 2015, 07:45 AM:

Gus, the motor is not mains frequency sensitive: that's because it is a DC motor, electronically controlled, with function generator. What you mention happens with AC motors.

Posted by Alan Rik (Member # 73) on April 17, 2015, 09:37 AM:

Yes like the difference between the Bauer T600 and the Bauer T610. The 600 uses an asynchronous motor which gets its speed off the herz. So when you use the projector it will always play fast if it was designed to work off of 50hz and is used in a country where the HZ is 60. But with the 610 it uses a DC motor where the HZ doesn't matter so it will play at the correct speed regardless of the country its in. think that's right?

Posted by Andrew Woodcock (Member # 3260) on April 17, 2015, 06:56 PM:

Rik you are right except you are quoting the UNIT of electrical Alternating Current by which an a.c. motor is governed, rather than the actual force which governs an A.C. Induction Motor which is the FREQUENCY of electrical alternating current.

Frequency when applied in terms of an AC current, is how many times per second the wave form alternates from +1 per second to -1 per second.

ie, a 2 pole ac 3 Phase induction motor rotates @3000rpm.
Why? Because it has 1 north pole and 1 south pole in every revolution that it makes.

Given that an A.C. Sinusoidal Wave Form consists of either 50 or 60 individual North & South Poles,dependant on your location in the world, in every one second due to the reciprocating sinusoidal wave form, it can be deduced that a 2 pole, 3 phase a.c. induction motor running at synchronous speed therefore rotates at 50 Cycles Per Second or 50Hz (Uk Mains Frequency) x 60 (seconds per minute) which equals 3000 RPM.

Similarly, in the U.S. A 2 Pole, 3 Phase A.C Induction Motor whose Electrical Mains Frequency is 60Hz (60 Cycles Per Second), will travel at a synchronous speed of 3600RPM due to the calculation of North & South Poles being 60Hz ( 60 North & South Poles Per Second) x 60 (seconds in a Minute of time).

Therefore as 4 Pole, 3 Phase a.c Induction Motor has twice as many poles, ie 2 Norths and 2 Souths, then it takes the 50 or 60hz Mains Frequency twice as long to complete one singular rotation.

Therefore the Synchronous Speeds for a 3 Phase 4 Pole motor are in the UK, 1500 RPM and in the U.S. 1800 RPM and so on as the number of poles expand ie 8 pole UK a.c. induction 3 phase motor =750 RPM Synchronous speed vs 900 RPM U.S. Synchronous Speed...

and so on and so forth...

The same principles apply to single phase A.C. Electrical Motors except they need a phase shift (or lag) to get them going I.e at least two phases or a capacitor to cause a phase shift.
Once locked on at synchronous speed they can happily run on just the one phase which is why the Cap Start method is used just for that... starting the motor.

[ April 17, 2015, 08:38 PM: Message edited by: Andrew Woodcock ]

Posted by Alan Rik (Member # 73) on April 17, 2015, 09:04 PM:

Haha! I knew you would know. [Smile]

That is a lot of information there.
I found out the hard way when I had a Bauer T600 and I was informed that it needed a US motor. The kind Derek Simmons once posted an ad for me in his newsletter where he asked if anyone had a US motor for a Bauer T600 projector for me.
Really great, great guy.

Posted by Alan Gouger (Member # 31) on April 18, 2015, 02:13 AM:

I am using a step up/down transformer for my Fumeo bought over seas. I run the projector at 18fps to make up for the 50 to 60hz difference, it works out well.

Posted by Martin Jones (Member # 1163) on April 18, 2015, 03:42 AM:

Andrew,
Since when was "HZ" or "HERZ" NOT the "frequency" of electric alternating current? "Hertz" is the modern term for "cycles per second".

Rik, you used the right term. Either that, or I totally wasted my time over the last 60 plus years!
Martin

Posted by Andrew Woodcock (Member # 3260) on April 18, 2015, 04:06 AM:

Yes of course, quite right Martin, I was just saying to Rik that it's the frequency of the waveform that governs the speed,with a simplistic explanation as to why. Hz are simply the units it is measured in.
Martin we could talk about resultant vectors etc but as said it was just to give Rik an understanding, that's all.

Posted by Martin Jones (Member # 1163) on April 18, 2015, 04:42 AM:

I think he already understood, otherwise he wouldn't have actually used the CORRECT term!
I'm afraid your convoluted (not simplistic to people without technical knowledge) explanation would only tend to confuse many members. Most already seem to understand that projector with AC motors run faster on 60Hz mains than they do on 5ohZ mains, and vice versa.
He certainly did!!
Martin

Posted by Andrew Woodcock (Member # 3260) on April 18, 2015, 05:01 AM:

Ok Martin, quite correct, just offering a simplistic explanation in layman's terms to why that is, that's all [Smile]

[ April 18, 2015, 06:35 AM: Message edited by: Andrew Woodcock ]

Posted by Alan Rik (Member # 73) on April 18, 2015, 08:07 AM:

Hi All,
I do appreciate the actual extra information! Its never too late to learn something new from someone who knows more...its the way we all learn more! No worries. [Smile]

Posted by Andrew Woodcock (Member # 3260) on April 18, 2015, 08:19 AM:

I always look upon new knowledge given to me, in exactly the same manner Rik.
I am fascinated with the knowledge that's out there from members of the forum. There appears nothing about films and associated equipment that someone on here doesn't know, it's just fantastic!! [Smile]

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