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Running a Preston and a Bartech off the same 3pin Arri power out.


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#1 thomas-english

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Posted 01 August 2011 - 06:40 AM

I want to use the Digital Bartech (Heden 26VE) as the remote iris channel for the DoP. Make up a preston to preston short power cable with a little pigtail out to power the digital bartech. This way the bartech just velcroes onto the Preston wherever it is on the camera.

Is there enough power out of a single 3Pin RS out on the Arri Alexa to do both the Preston (one motor) and a Digital Bartech ?
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#2 JimBartell

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Posted 01 August 2011 - 10:40 AM

The power requirement of the BDR w/M26VE is very low, particularly when used for Iris control. I suspect it would be less than 500 mA, so you should have no problem.

Jim Bartell
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#3 Marc Alfonso

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Posted 05 August 2011 - 02:54 PM

Hi All

Alex and I just ran some tests in the Lab to get numbers.

fSTOP BDR with M26Ve Currents


Just to refresh everyone: 1000 mA = 1 Amp


12V

Calibrating - Moving 119.75 mA
Calibrating - First stop 546.25 mA
Calibrating - Second stop 540.75 mA

Motor - not moving 74.76 mA
Motor - moving 134.5 mA
Motor - moving under load 758.13 mA
Motor - stalled 1.38 A


24V

Calibrating - Moving 91.18 mA
Calibrating - First stop 481.79 mA
Calibrating - Second stop 497.17 mA

Motor - not moving 51.22 mA
Motor - moving 164.88 mA
Motor - moving under load 799.88 mA
Motor - stalled 2.55 A


Cheers,

Marc
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#4 thomas-english

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Posted 06 August 2011 - 08:54 AM

Thanks guys. This is a great setup to have remote DoP iris on an MDR1/HU1.


Hi All

Alex and I just ran some tests in the Lab to get numbers.

fSTOP BDR with M26Ve Currents


Just to refresh everyone: 1000 mA = 1 Amp


12V

Calibrating - Moving 119.75 mA
Calibrating - First stop 546.25 mA
Calibrating - Second stop 540.75 mA

Motor - not moving 74.76 mA
Motor - moving 134.5 mA
Motor - moving under load 758.13 mA
Motor - stalled 1.38 A


24V

Calibrating - Moving 91.18 mA
Calibrating - First stop 481.79 mA
Calibrating - Second stop 497.17 mA

Motor - not moving 51.22 mA
Motor - moving 164.88 mA
Motor - moving under load 799.88 mA
Motor - stalled 2.55 A


Cheers,

Marc


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#5 Kar Wai Ng

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Posted 06 August 2011 - 11:19 AM

Do you have numbers for current draw for Preston motors with the BDR?
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#6 Lawrence Karman

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Posted 06 August 2011 - 11:55 AM

max current draw on the Alexa accessory connectors is 2.2A according to the manual
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#7 Marc Alfonso

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Posted 09 August 2011 - 09:47 PM

Do you have numbers for current draw for Preston motors with the BDR?



I only have a Preston DM2 motor in the lab at the moment and will work on getting the data
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#8 Marc Alfonso

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Posted 10 August 2011 - 02:36 PM

Do you have numbers for current draw for Preston motors with the BDR?



fSTOP BDR Currents with Preston DM2 motor


12V

Calibrating - Moving 136.5 mA
Calibrating - First stop 231.25 mA
Calibrating - Second stop 279 mA

Motor - not moving 74.88 mA
Motor - moving 163.75 mA
Motor - moving under load 624.75 mA
Motor - stalled 1.29 A


24V

Calibrating - Moving 102.75 mA
Calibrating - First stop 222 mA
Calibrating - Second stop 287.25 mA

Motor - not moving 54.33 mA
Motor - moving 230.5 mA
Motor - moving under load 619.25 mA
Motor - stalled 1.87 A

Regards,

Marc
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#9 thomas-english

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Posted 10 August 2011 - 03:38 PM

Looks good to me!
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