I am helping a friend to troubleshoot a problem with his newly purchased RV10 and I was wondering if anyone has seen this issue or knows what the cause is. His plane has two B&C alternators, a 60A for the main and a standby. The output of both go to the VPX and on the VPX there are two CB for the Alt Field, one for each, which are connected to a physical switch on the panel.
The first observation: Not both Alt field CB can stay closed at the same time. When we flip the main Alt field On, the CB for that goes green but as soon as the second Alt field switch is turned On, the first CB jumps as the second one goes green. This means a manual process is required if the active alternator goes dead. This however might be the normal operation as VPX manual indicates that only one PlanePower alternator can be in the ON position which may also be true for B&C.
The second issue which is more puzzling and rather critical: If/when the primary alternator is operational, if the main battery gets disconnected, then we get an overvoltage for the Alt field CB and gets tripped and all power to the ship is dead. The normal draw that we see for the CB is about 2.8A. This does not happen if the standby alternator is operational, removing the cable from the battery has no impact on the alternator operation.
This plane has an electronic ignition that is dependent on ships power, so the first scenario will cause the fan in the front to stop working, hence the criticality of the issue.
Any/All info is welcomed and appreciated.
The first observation: Not both Alt field CB can stay closed at the same time. When we flip the main Alt field On, the CB for that goes green but as soon as the second Alt field switch is turned On, the first CB jumps as the second one goes green. This means a manual process is required if the active alternator goes dead. This however might be the normal operation as VPX manual indicates that only one PlanePower alternator can be in the ON position which may also be true for B&C.
The second issue which is more puzzling and rather critical: If/when the primary alternator is operational, if the main battery gets disconnected, then we get an overvoltage for the Alt field CB and gets tripped and all power to the ship is dead. The normal draw that we see for the CB is about 2.8A. This does not happen if the standby alternator is operational, removing the cable from the battery has no impact on the alternator operation.
This plane has an electronic ignition that is dependent on ships power, so the first scenario will cause the fan in the front to stop working, hence the criticality of the issue.
Any/All info is welcomed and appreciated.