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Voltwatch problems..

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Old 10-14-2006, 10:58 AM
  #1  
wheels down green light
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Default Voltwatch problems..

I have a voltwatch mounted in my Rascal 110, when I move any control surface the voltwatch lights up. The yellow and the lower red led flashes as well the green leds. I have checked all conections and polarity on the on board battery pack.

Any ideas are welcome

Thanks Mike Moyer AMA # 789755
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Old 10-14-2006, 11:05 AM
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cooperd
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Default RE: Voltwatch problems..

I've seen this also. It occurs when the battery pack is getting down on voltage in my case. My plane has large servos, two for AILs. If your battery is fully charge when this is happening, it may be that your battery pack is weak, incapable of putting out sufficient amperage without a large voltage drop. Check your pack with a digital voltmeter that applies a load as it reads the voltage.
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Old 10-14-2006, 11:25 AM
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rajul
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Default RE: Voltwatch problems..

What type of servos and battery pack are you using? If you're using digital servos, the current draw could be higher. Some NiMH packs have higher internal resistance which can cause this too.
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Old 10-14-2006, 11:53 AM
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Geistware
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Default RE: Voltwatch problems..

OK, help me better understand.
Are you saying that with no movement, none of the lights are lit?
Is the pack fully charged?
What pack are you using?
What servos are you using?
A little more informtion is needed.
ORIGINAL: wheels down green light

I have a voltwatch mounted in my Rascal 110, when I move any control surface the voltwatch lights up. The yellow and the lower red led flashes as well the green leds. I have checked all conections and polarity on the on board battery pack.

Any ideas are welcome

Thanks Mike Moyer AMA # 789755
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Old 10-14-2006, 01:53 PM
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Rodney
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Default RE: Voltwatch problems..

The Voltwatch is quite sensitive with little or no lag. What you are seeing is actual voltage depressions at the point your Voltwatch is plugged in. You are seeing the actual voltage drop that occurs for a millisecond or two every time you draw a gulp of currrent to drive the servos. There is a voltage drop somewhere between the battery and the point you plug in the Voltwatch. Small gage wiring in the switch harness or dirty switch contacts will agravate this indication. Your voltwatch is doing exactly what it is supposed to be doing and doing it well, it is telling you your installation would benifit by a better switch, larger gage wiring and/or a battery with less internal resistance or more peak current capacity.
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