Overvoltage protection

by Peter Harrison in 915iS Technical Questions 2 years ago

Is there any over voltage protection in the Rotax 'fuse box'. I am concerned what would happen if either regulator failed and overcharged the battery. Risk of fumes or fire. Is there a crowbar circuit to trip a fuse inside the black box we call the fuse box.

Or should I provision this protection elsewhere in my 915is system?

Re: Overvoltage protection

by Eric Page » 2 years ago

Eric Page

4 98 386

I asked a similar question recently about the 912iS (virtually identical electrical system to your 915iS). Here is that thread. My conclusion was that you have to implement your own OVP scheme.

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Re: Overvoltage protection

by Richard T. Schaefer » 2 years ago

Richard T. Schaefer

4 3 6

I use the Vertical Power VPX. It has an Alternator Field circuit.

You can use this to engage a Relay to pass the alternator citcuit.

The VPX has over voltage sensing and will automatically disables this circuit on over voltage.

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Re: Overvoltage protection

by Ken Lehman » 2 years ago

Ken Lehman

0 10 21

I use a 40 amp relay with crowbar activation on my 912iS. This also allows depowering the airframe in the event of smoke in the cockpit. Turning off the master will isolate the battery but 30 amps from the alternator is still available according to the rotax wiring diagrams.

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Overvoltage protection

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