Shared power ursa mini

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AbdoulUK

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Shared power ursa mini

PostWed Jun 19, 2019 8:19 am

Hi all,
I tried to ask before but didn't get a clear answer.

Is it safe to run a dtap cable from my monitor to the battery (or battery plate) connected to my ursa mini pro? I i only ask because of a previous thread speaking about circuit boards frying etc and was never clear on what was exactly being said about shared power.
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jerrygladh

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Re: Shared power ursa mini

PostWed Jun 19, 2019 8:33 am

Well, I smoked one G1 trying to connect VA to D-Tap battery plate.
Coluld be some fault with just that camera but I stick to battery now....
Worth mentioning is the excellent UK BM-service that placed a new camera
at my desk in Sweden in 4 days :-)

Jerry
DR Studio | Mac Pro 7.1 16c | 192 GB Ram | 2x RX 6900 xt | MBP M1
BM G2 | G1 | 3xP6kPro | Canon C300 M3, R5c, XF605
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AbdoulUK

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Re: Shared power ursa mini

PostWed Jun 19, 2019 2:46 pm

Thanks for letting me know. I was hoping to avoid batteries for the excess weight. Anybody else got any info on this?
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Denny Smith

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Re: Shared power ursa mini

PostWed Jun 19, 2019 4:39 pm

I use a BMD battery plate on the Ursa Broadcast (same body/power supply as a Ursa Mini Pro) and it has a DTap port on it that comes from the camera’s power supply, not powered directly from the battery from what I understand, which is why the power plate connects with a multi-pin Molex connector.

I connect my SmallHD Monitor to the BMD battery plate DTap, the EVF to the front 4-pin power connector (this is also a regulated 12-VDC connector) and power the camera, EVF and Monitor from the camera battery, via the Ursa. I do not connect directly to a DTap on the battery. If you do not have a EVF, you can use the front 4-pin xlr connector to power the monitor, just need the right cable, which are available.

That said, you need to take precautions to prevent a ground loop issue. First, turn off the camera and monitor before connecting power and SDI cables between them and the camera. When all is connected, turn on camera, turn on EVF (if using one) and or turn on Monitor. This way you are powering up the camera first (biggest startup power draw), then the Monitor. Power down before disconnecting.

Following the above practice, I have never had an issue. I would not power multiple devices directly from a battery like a camera battery without some type foe BDS (battery distribution system). With the Ursa/Mini the camera is the BDS.
Cheers
Denny Smith
SHA Productions
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carlomacchiavello

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Re: Shared power ursa mini

PostWed Jun 19, 2019 4:43 pm

The rule is to turn on devices from external to internal connections
I had battery plate that give power to camera, viewfinder, ssd with cfast to esata adapter, to va4k and so on by dtap
No problem. But I power up all before ursa


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Denny Smith

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Re: Shared power ursa mini

PostWed Jun 19, 2019 5:01 pm

Yes, except the front 4-pin XLR is not hot until you turn on the camera. However, I think the battery plate DTap is hot whenever a battery is mounted. I will check this.
Cheers
Denny Smith
SHA Productions
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Tim Schumann

Blackmagic Design

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Re: Shared power ursa mini

PostThu Jun 20, 2019 3:39 am

The D-tap on our URSA VLock Battery Plate and URSA Gold Battery Plate is regulated from the camera so you should be okay. We can't speak for third party plates but ours regulates the power out to the D-tap from the camera.
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rick.lang

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Re: Shared power ursa mini

PostThu Jun 20, 2019 3:54 am

I certainly can confirm that as I have the PD Movie wired to the BMD Battery Plate and the PD Movie loses power whenever I turn off the camera.


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Rick Lang
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Denny Smith

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Re: Shared power ursa mini

PostThu Jun 20, 2019 5:08 am

Ah, good p, thanks Rick, thought as much, but was going to confirm this, now I don’t.
Thanks Tim for confirming the DTap on the BMD plates.
Cheers
Denny Smith
SHA Productions

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