Would be nice, in case the voltage on one of these internally regulated alternators used on so many experimentals (like mine), goes kind of high, kind of fast. Maybe, it would just be better if I added my own OV protection to protect everything?
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Built in over voltage protection?
- Thread starter mikey1ten
- Start date
khorton
New Member
If your alternator runs away, it will almost certainly take out all your avionics, not just the Dynon stuff.
I highly recommend you put in over voltage protection on the alternator, unless you can afford to risk the dollars and time to replace all avionics.
I highly recommend you put in over voltage protection on the alternator, unless you can afford to risk the dollars and time to replace all avionics.
- Joined
- Mar 23, 2005
- Messages
- 13,226
First, as is shown on the side of all EFIS and EMS units, the Dynon stuff will run up to 30V with no problems. On a 12V system, this is a lot of overhead.
Per a spec for piston airplanes (the name of which escapes me now), the units will also survive 60V for at least 1/10th of a second. The power supplies in the Dynon products are really robust. Almost everyone leaves them on during engine crank and shutdown with zero problems.
Per a spec for piston airplanes (the name of which escapes me now), the units will also survive 60V for at least 1/10th of a second. The power supplies in the Dynon products are really robust. Almost everyone leaves them on during engine crank and shutdown with zero problems.
I figured the Dynon might handle most problems. I will go ahead and add ov protection for everything. Can anyone recommend a good one for the ones with built in regulators? I like the built in regulators. Not so much trouble having to adjust them, once in a while. Thanks,for all info. Michael.
khorton
New Member
B&C Specialties sells an over voltage protection system. It was originally designed to work with externally regulated alternators, but they show how to use it to control a contactor in the alternator B lead (i.e. the big wire that the power comes from).Can anyone recommend a good one for the ones with built in regulators?
http://www.bandcspecialty.com/parts.html - look for the OVM-14 in the Miscellaneous Wiring Supplies section.
You also need an S701-1 Continuous Duty Contactor from B&C Specialties.
http://www.aeroelectric.com/articles/9003_ins.pdf - Installation instructions for the OVM-14 - see page 3 for internally regulated alternators. Note - the part number and vendor shown on the installation instructions don't match the B&C OVM-14, as the product was designed and originally sold by the AeroElectric Connection.
http://www.aeroelectric.com/articles/bltinreg.pdf - article about internally regulated alternators and over voltage protection systems by Bob Nuckolls from the AeroElectric Connection.