fstringham7a
Well Known Member
RE: Indicated Voltage Problem
I am just about to put my RV7A in the air but....I have one minor problem to solve. The Dynon EMS D-120 is not indicating TRUE voltage output both with the engine in operation or when running on the battery.
My electrical architecture is Z13/8 modified to have the B&C 40 amp alternator regulated by LR3C-14. The amp/current pick off shunt is in location A position as found in the Dynon EMS D-120 install manual page 3.12When the Master Battery/Main Alternator switch is actuated the Dynon shows 10.8 volt. When the Essential bus is actuated the voltage climbs to 12.8 with or without the Master on.
Every possible connection point has had a continuity check/voltage check completed. We have also followed the B & C LR3C-14 trouble shooting guide which had no neitive results so the LR3C would SEEM to be OK . All grounds have been checked for problems...one found.
But all (except using B&C trouble shooting guide)roads seem to lead to a bad LR3C-14.....but Bill at B&C thinks there has to be another problem....................In short every connection up to the regulator are 12.8 volts with the master on but once past the LR3C it read 10.8 at the power pin location #1 on the D-Sub. This indicated two things the problem is at the LR3C and the Dynon D120 is isolated showing it isn't the problem....................
We know the altenators ..... both main and aux SD8 are doing there thing because when we have ground run the engine the battery charge has been maintained
So where do I check next??????????????????????????????
Frank @ 1L8 ...RV7A... ready to fly?????maybe
I am just about to put my RV7A in the air but....I have one minor problem to solve. The Dynon EMS D-120 is not indicating TRUE voltage output both with the engine in operation or when running on the battery.
My electrical architecture is Z13/8 modified to have the B&C 40 amp alternator regulated by LR3C-14. The amp/current pick off shunt is in location A position as found in the Dynon EMS D-120 install manual page 3.12When the Master Battery/Main Alternator switch is actuated the Dynon shows 10.8 volt. When the Essential bus is actuated the voltage climbs to 12.8 with or without the Master on.
Every possible connection point has had a continuity check/voltage check completed. We have also followed the B & C LR3C-14 trouble shooting guide which had no neitive results so the LR3C would SEEM to be OK . All grounds have been checked for problems...one found.
But all (except using B&C trouble shooting guide)roads seem to lead to a bad LR3C-14.....but Bill at B&C thinks there has to be another problem....................In short every connection up to the regulator are 12.8 volts with the master on but once past the LR3C it read 10.8 at the power pin location #1 on the D-Sub. This indicated two things the problem is at the LR3C and the Dynon D120 is isolated showing it isn't the problem....................
We know the altenators ..... both main and aux SD8 are doing there thing because when we have ground run the engine the battery charge has been maintained
So where do I check next??????????????????????????????
Frank @ 1L8 ...RV7A... ready to fly?????maybe