Which error?


--
James H. Macklin
ATP,CFI,A&P

"RST Engineering" wrote in message
...
| In my last 40 years as a professional avionics engineer
have I seen this
| many errors in a single document.
|
| PLEASE take this post and TRASH it.
|
| Jim
|
|
|
| "Jim Macklin" wrote
in message
| news:22mqf.30260$QW2.2267@dukeread08...
| The 12 volt generator/alternator will be at 14-15 volts
| nominal when within the working range of RPM. The
voltage
| regulator should keep the voltage within that range
without
| any significant variation.
|
| Just what are you intending to be warned against? The
load
| meter gauge shows the load being carried by the
generator
| system, the ammeter shows whether the generator or
battery
| is supplying the power being used, An ammeter should be
| showing only a slight charge all the time as it keeps
the
| battery "topped off." If the battery is any good, the
| ammeter will return to low indicated charge within a few
| minutes after starting the engine. At a low idle, the
| battery will show a discharge because the generator is
not
| carrying the load and the battery is discharging to
carry
| what the demand is at the time. This is not a problem
in
| the short term, such as a power-off landing or glide,
but
| anytime that the engine is in the power range, the
generator
| [alternator] should be carrying all the load.
|
| Power relays need about 10 volts to stay engaged. If
you
| are building a home-built airplane, you could have a
yellow
| warning light at less than 13.9 volts and a red warning
at
| 12.8. Open cell no-load voltage is 2.2 volts or 13.2
volts
| on a lead/acid battery.
|
| Certificated aircraft require certificated parts. You
can
| get a cigarette lighter plug-in monitor.
|
|