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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › use castle esc as a low voltage alarm
07-04-2014 02:19 PM  6 years ago
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tomtek

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ga

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use castle esc as a low voltage alarm
I just read a very interesting post. A forum member uses his castle esc as a low voltage alarm. He sets the cell voltage to 3.7 on the esc and than checks motor interrupt. When the first cell reaches 3.7 the esc spools the motor down a little to let you know. If I am correct that 3.7 per cell would indicate you have used close to 80% of the pack. Am I missing something or is this an excellent way to manage voltage use without adding any more gizmos?
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07-04-2014 02:24 PM  6 years ago
Rob43

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Midland, MI USA

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I don't think it's quite that simple. Using a high LVC can be problematic, as it will dip to this voltage occasionally during the flight. But if the firmware in the Castle has sufficient delay times set for this, it might be useful. I just seem to recall a modeler at our field having a monitor on his plane with like 3.5v setting for an audible alarm, and it was constantly going off even when the pack was pretty close to full charge. Soon as he'd back off on throttle, the alarm would clear.Rob
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07-04-2014 02:34 PM  6 years ago
Pistol Pete

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Seffner, FL

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Am I missing something or is this an excellent way to manage voltage use without adding any more gizmos?
https://rc.runryder.com/t768829p1/

https://rc.runryder.com/t769429p1/

Yes, you read it correctly.
~~Enjoying the hobby one flight at a time~~
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07-16-2014 07:19 PM  6 years ago
ChristianM

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Oslo, Norway

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I am guessing that it was my post that you referred to:
I have the TM1000 on my X5 to report pack voltage. It logs it several time pr second and any spike below the alarm set point (3.7 V/cell) will trigger the alarm. If I land after the first instance of the alarm then I have used less than 50% of the capacity. So reading the voltage with the TM1000 directly does not work well and is quite frankly annoying.

I also have a Castle Creations ESC with a low voltage alarm which work really well. I set it to 3.7 V/cell and to oscillate the motor power when it triggers. It has some sort of averaging algorithm so it rejects the voltage drop peaks. With this setup I can forget about the timer and fly until I hear/see the power oscillate and land thereafter. I typically have 22%-25% capacity left in the battery with that setting. Love this feature.
Like I said in the post the method realy works great. You can choose how you want the ESC to respond after it hits the set point; reduce RPM, oscillate the RPM or reduce power. Personally I prefer the oscillation.

Christian
Burn fuel, be happy
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07-16-2014 10:01 PM  6 years ago
JKos

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Redondo Beach, CA

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> When the first cell reaches 3.7

Just a slight clarification... The ESC does not measure each cell individually. It is simply looking for total pack voltage to drop below the voltage per cell setting times the number of detected cells (which is done based on initial voltage).

- John
RR rules!
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07-17-2014 09:25 AM  6 years ago
ChristianM

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Oslo, Norway

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True. Good clarification.Burn fuel, be happy
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07-17-2014 08:07 PM  6 years ago
TurboRacer

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FL

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Do yourself a favor and get a handful of these:

5 for $10 on ebay.

They have adjustable voltage alarms - I set them at 3.6v. Once a cell hits that or lower, it screeches pretty loudly! I stick on on the balance tap of the battery every time I fly. Once it starts screaming at anything above half throttle on my airplanes - I know it's time to land. With the heli, I wait till it starts screaming while just hovering - then I know it's time to land.

Works perfect every time. Comes down with 3.75v in each cell. Perfect.
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07-17-2014 09:16 PM  6 years ago
JKos

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Redondo Beach, CA

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> 5 for $10 on ebay.

Unfortunately, the ones I received are not calibrated properly cell-to-cell which makes them pretty worthless. YMMV. The one name-brand one I bought is spot on.

But, yes, they are very loud and you will hear them while flying.

- John
RR rules!
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