C70: C70 draining BP camera battery while attached to v-mount battery via D-tap

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drummondb

Well-known member
Could use help. My C70's seem to be draining the camera battery even when attached to a v-mount battery via dtap. Same issue using several different c70-to-dtap cables, including Kondor Blue.

As soon as I remove the camera battery, it kicks over to the v-mount battery, and the power remains uninterrupted. But as soon as I re-attach the camera battery, the OSD on the LCD shows the volt meter replaced with the BP battery remaining time.

Can anyone else confirm this? On older Canon cinema cameras, the camera battery is generally not depleted much while attached to an external battery.

video of phenomenon:
 
Hmm. I have a C70 and couple of those Core SWX batteries, but don't use V-mount batts on that camera. A good not-here resource is this Facbook group, which used to have a compact name but now has an unwieldy handle. Still, gets some traffic and there are some good people there:

Canon C50, C400, C80, C70, R5C and C-Series Professionals, Cinema EOS​

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Good luck!
 
Canon seems to think this is normal. From my testing, my v-mount battery and simply dtap cord read as DC in 14 V. That's when the main battery drains.

But when attach he official AC adapter, the C70 reads DC in 24V. And the battery does NOT drain while using that in tandem. I'm going to try a regulated cable to get the v-lock closer to 24V, and see if that works.
 
drummondb said:
Canon seems to think this is normal. From my testing, my v-mount battery and simply dtap cord read as DC in 14 V. That's when the main battery drains.

But when attach he official AC adapter, the C70 reads DC in 24V. And the battery does NOT drain while using that in tandem. I'm going to try a regulated cable to get the v-lock closer to 24V, and see if that works.
Click to expand...

I know nothing but if the input is expecting 24 and getting 14.4 its gonna think that supply is dead and switch to the interna.. Feed in 24 I guess.
 
drummondb said:
Could use help. My C70's seem to be draining the camera battery even when attached to a v-mount battery via dtap. Same issue using several different c70-to-dtap cables, including Kondor Blue.

As soon as I remove the camera battery, it kicks over to the v-mount battery, and the power remains uninterrupted. But as soon as I re-attach the camera battery, the OSD on the LCD shows the volt meter replaced with the BP battery remaining time.

Can anyone else confirm this? On older Canon cinema cameras, the camera battery is generally not depleted much while attached to an external battery.

video of phenomenon:
Click to expand...
The C70 is, like the XF705 and 605, and requires a 24 volt input. You need to use a regulated DC/DC converter to step up your 14.4 or 14.8 volt V-Mount batteries up to 24 volts. Like this unit, linked below, with a D-Tap plug and DC/DC converter in the line. We use similar units for the Sony FX9 and FX6 as they require a 20 volt input. VERY IMPORTANT!! ALWAYS plug the D-Tap into the battery first. Then plug the camera end in. Should you do it the other way around and when plugging the D-Tap in and make positive contact first, you can do serious damage to your camera.

In fact, to avoid any possibility of a short circuit connection, I use a separate switch operated V-Mount plates on all cameras. These plates have D-Tap outputs, along with multiple USB-A and USB-C ports. This way the D-Tap cable always stay plugged into the plate. And when having to plug into the plate, the D-Tap socket can remain dead until the switch on the plate is activated.

https://t.ly/B_hlI

https://t.ly/b2Pph

This is also worth reading if using V-Mount batteries. I've not experienced it, touch wood, but have seen this issue a few times.:

Quote:
"My advice is to take great care when using D-Taps to power accessories off the camera's battery. Always do all your power connections first, then check any accessories power up correctly before finally connecting the SDI or HDMI cables. And then do the reverse when disconnecting, SDI/HDMI disconnected first, power down the camera and accessories properly, remove the power connections last. It’s worth pointing out that many cameras from many manufacturers, including Arri, Canon etc. have suffered damage due to power surge issues related to D-Tap connectors.

Additionally, always power the camera up from the on/off switch and then switch it off and allow it to power down properly. Never remove or restore the power to a camera that is turned on. The camera's power switch does not connect/disconnect the power, it is a switch that instructs the camera to boot up or power down in a specific order, and it needs the power to the camera to be correctly connected and stable to ensure this all happens in the right order. If using a V-Lock adapter, you really need to avoid the camera suddenly losing power when the battery shuts off without warning."

You can read the rest of the article here:

https://www.xdcam-user.com/tag/d-tap/

Chris Young
 
cyvideo said:
The C70 is, like the XF705 and 605, and requires a 24 volt input. You need to use a regulated DC/DC converter to step up your 14.4 or 14.8 volt V-Mount batteries up to 24 volts. Like this unit, linked below, with a D-Tap plug and DC/DC converter in the line. We use similar units for the Sony FX9 and FX6 as they require a 20 volt input. VERY IMPORTANT!! ALWAYS plug the D-Tap into the battery first. Then plug the camera end in. Should you do it the other way around and when plugging the D-Tap in and make positive contact first, you can do serious damage to your camera.

In fact, to avoid any possibility of a short circuit connection, I use a separate switch operated V-Mount plates on all cameras. These plates have D-Tap outputs, along with multiple USB-A and USB-C ports. This way the D-Tap cable always stay plugged into the plate. And when having to plug into the plate, the D-Tap socket can remain dead until the switch on the plate is activated.

https://t.ly/B_hlI

https://t.ly/b2Pph

This is also worth reading if using V-Mount batteries. I've not experienced it, touch wood, but have seen this issue a few times.:

Quote:
"My advice is to take great care when using D-Taps to power accessories off the camera's battery. Always do all your power connections first, then check any accessories power up correctly before finally connecting the SDI or HDMI cables. And then do the reverse when disconnecting, SDI/HDMI disconnected first, power down the camera and accessories properly, remove the power connections last. It’s worth pointing out that many cameras from many manufacturers, including Arri, Canon etc. have suffered damage due to power surge issues related to D-Tap connectors.

Additionally, always power the camera up from the on/off switch and then switch it off and allow it to power down properly. Never remove or restore the power to a camera that is turned on. The camera's power switch does not connect/disconnect the power, it is a switch that instructs the camera to boot up or power down in a specific order, and it needs the power to the camera to be correctly connected and stable to ensure this all happens in the right order. If using a V-Lock adapter, you really need to avoid the camera suddenly losing power when the battery shuts off without warning."

You can read the rest of the article here:

https://www.xdcam-user.com/tag/d-tap/

Chris Young
Click to expand...
You can also pick up some SafeTap Dtap cables as a precaution. Plenty of places to get them, but I've bought stuff from Mutiny in the past and they do a good job.

 
DustinSchmidt said:
You can also pick up some SafeTap Dtap cables as a precaution. Plenty of places to get them, but I've bought stuff from Mutiny in the past and they do a good job.

Click to expand...
I hear people complain about the price of some of these protective D-Taps. I tell them they are mad making such statements, considering the protection they offer for the price vs the sometimes enormous bills you can encounter to fix your cooked camera.

Chris Young
 
UPDATE: I tried a regulated cable that delivers 24V from a v-mount's D-tap port to the C70, and as expected, the BP camera battery does NOT seem to drain while used in tandem with the v-mount.
 
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