8mm Forum: SEIMENS 2000 Voltage Change?

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Posted by Marty Pinkerman (Member # 1523) on June 27, 2015, 08:04 PM:

I just received a BEAUTIFUL Seimens 2000 from Germany today.
My problem is that the voltage requirement is 220v. Do I need a step up transformer "110v to 220v" .... or is there an alternate wiring option inside the machine ?

I have a 120v resister for the lamp.

Can anyone help with this ?

Thanks

Posted by Thijs de Kort (Member # 4897) on July 02, 2015, 02:01 AM:

Hey Marty,
i think that you will need a transformer for the input source. Most machines that fly in overseas need one since they are build for a different power source. Also if you need any parts have a look here Siemens spare parts
Thijs

Posted by Josef Grassmann (Member # 378) on September 19, 2015, 10:48 AM:

Siemens 2000 has 110V AC motor built in.
Therefore you have to bridge wire wounded resitor on ceramic cross, behind projection bulb, simply tier off.
there are two resistors. At botton series resistor for motor (small wire diameter), above series resistor for bulb (thick wire diameter). When you bridge both resitors it should work.

Josef

Posted by Steve Klare (Member # 12) on September 19, 2015, 01:00 PM:

Is there a speed change to allow for the difference between 50 Hz. and 60 Hz. mains power?

With an AC motor this would take you from 24 FPS to almost 29!

Posted by Josef Grassmann (Member # 378) on September 24, 2015, 03:36 PM:

On Siemens 2000 speed is adjusted (stepless) from 16fps to 26fps.
There is a breaker contact wich opens circuit as soon as preadjusted speed = fps is reached.
Speed is independ from mains frequency.
At 60 Hz impedance of motor coils is higher, resulting in a smaller
current and lower wattage /torque. But I believe a Siemens 2000 can handle that.

Posted by Steve Klare (Member # 12) on September 25, 2015, 08:33 AM:

That's a new one on me! In power supplies we call this "bang-bang" regulation and even there I've only seen it once.

-kind of like driving a car: you step on the gas for a few seconds, then you let it off a few...

So I would imagine when this machine is running, you keep hearing the relay clicking as it closes to add more mechanical energy and then opens up and lets it coast down before it does it again.

I'm guessing there's a pretty substantial flywheel smoothing this out.

Posted by Paul Mason (Member # 4015) on September 26, 2015, 05:12 AM:

Although they used brushed ac/dc universal motors the Bell & Howell Filmosounds before 1960 used governor speed control switching the motor in and out at high speed.

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