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That is a good idea about the Bob Nuckolls list. I have a split electrical system, with a battery in the front for all of the radios and instruments, and then a battery in the rear for the engine systems. There is an isolator from the alternator, for charging both batteries. The only connec6tion tot he front is a #10 ground wire which runs between the two buses. I have pretty large cables (0 gauge I think) that connect from the battery to the engine block for ground, and the starter on the positive side. There is another tap on the positive side that feeds through a master relay to the distribution buss for the fuel pumps, coils, injectors, and EC-2. Most of the wiring from front to back, for sensors, relays, etc, run through a duct on the passenger side of the plane. The wiring duct on the pilot side of the plane has the EC-2 to panel wiring, and that is all. This set up worked fine for about three years. I had a problem with the ignition switch, which is a standard Cessna type ignition, with the mag test positions. The starter solenoid contact had some crud on it, and I had to hit the start position several times before it would engage the starter. I removed the ignition switch, took it apart, cleaned it up and reassembled it. That fixed the problem, but it seems that my starting difficulties began shortly after that. I have verified all connections from the ignition switch, as I do use the mag test positions to disable a set of coils at a time for the controller B test. I don't know if this answers your question or not.
Steve
Bill Bradburry wrote:
Steve,
Can you describe your wiring setup? Schematic and describe how the wires are
routed? Are you using one of the Aeroelectric architectures?
I also suggest you put this question to Bob Nuckolls list. (aeroelectric-list@matronics.com)
Bill B -----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Steve Brooks
Sent: Saturday, November 21, 2009 10:50 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Need a sanity check
I have been working on an issue for three weeks now, with very intermittent
spark when cranking the engine. Needless to say, it won't start either.
I have a spark plug out of each rotor, and have them clamped to a good
ground, so that I can see a spark on the front and rear rotor.
If i rotate the CAS by hand, or turn the prop by hand, I get good spark. When cranking with the starter, I get an initial spark, and then an
occasional spark on the front or rear rotor. Interesting, when I let off
the starter, I get a couple of good sparks as it coasts to a stop. Both controllers do the same thing BTW.
I had emailed Tracy, as at one time I thought that the EC-2 had an issue.
Tracy said that he had seen this symptom a couple of times before, and it is
caused by noise from the starter interfering with the CAS signal. He
suggested that I install a 1K resistor across each of the crank angle
sensors. I installed the resistors, but it did not cure the problem.
This morning, determined to get to the bottom of this, I removed the battery
cable running to the starter, and using a spare battery, and a jumper cable
for the ground, I cranked the starter with this battery, which was isolated
from the airplanes electrical system. It had good spark on both rotors ....
yeah !!!
So then, I decided to reroute the starter cable on the other side of the
engine, which keeps it away from the other wiring. I hooked it back up to
the aircraft battery, crossed my fingers and cranked the started. Same problem. I thought that perhaps the noise was getting into the EC-2, so I put the spare battery in the back seat (pusher aircraft), and
using some jumper clips, I hooked the EC-2 through a fuse to the isolated
battery. Same problem.
I had extended the CAS wiring when I replaced the engine, so I decided to
reroute the shielded CAS wiring, so that I could eliminate the unshielded
wires, which were about 12" long. Same problem.
I am struggling with what to try next. This problem started before I
swapped the engine, as it was very hard to get started, though for three
years prior to that, I had no issues, and it started easily.
Has anyone else seen this type of problem, or have any suggestions ?
Steve Brooks
Cozy MKIV 13BT
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