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1. 03:31 PM - B-lead protection and other things (Robert L. Nuckolls, III)
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| Subject: | B-lead protection and other things |
If you look at my schematic, the current shunt is located near the
alternator. If the 60 Amp circuit breaker is pulled, the 2 amp and 5
amp field breaker is closed. What will the voltage be at the
alternator output?
Very high . . .
With the open 60 Amp breaker, the regulator has no feedback or sense
of the alternator voltage. Does the field go "full on" and the
alternator voltage goes to max output? If so, what is this
output. The voltage at the shunt is directly connected to the Dynon
Skyview Engine monitor. If this goes above 30 Volts than this will
explain the damage to the Engine Monitor Module.
It's not that simple. Most instrumentation
INPUTS are not particularly vulnerable to
higher than normal voltages . . . but check
with Dynon on this.
I don't recommend circuit breakers in the
alternator B-lead . . . haven't illustrated
such a device in that location for longer than
I can recall. Please take your b-lead to the
HOT side of the starter contactor. Mount a mini-anl
CURRENT limiter next to the starter contactor
to protect the b-lead wire.
http://tinyurl.com/hudpg2g
You can buy a 'stock' mini-anl mounting
block . . . or make your own from a piece
of durable, insulating material. Phenolic,
delrin, etc.
http://tinyurl.com/h9ze97d
If you use a purchased mount similar to
that described above, remove and throw away
the 'set screws' provided to grip your
fat wires. Install REAL terminals on the
fat wires and bring them directly into
contact with the ANL tabs by having them
SHARE the same fastener.
Circuit breakers on alternator b-leads
was never an elegant idea . . . and if
opened accidently or due to nuisance trip
. . . the outcome can be unhappy.
I plan on installing a 18V MOV on each of the shunt sense lines to
ground. This will short out to ground if the alternator output
exceeds 18VDC and blow the two 1 amp fuses (not shown) to protect the
Dynon Circuits.
MOV's are also not a good idea . . . I
got suckered into considering them early
on based purely on their spec sheets. As
it turns out, the transorb is 100X more
suited to this task. Use at least 1500W
rated devices.
http://tinyurl.com/hjoc5aw
Bob . . .
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