Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml@lancaironline.net
Date: Mon, 01 Mar 2004 13:23:02 -0500
Message-ID: <redirect-3052946@logan.com>
From: Rumburg William J NNSY <RumburgWJ@nnsy.navy.mil>
Subject: RE: [LML] Re: LNN issue 45 - wiring LNC2 hydraulics with Bosch re
	lays
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"

 Scott Krueger:
< 1. Usually, a full bridge rectifier is capable of carrying quite a bit of
current (20A?) and is shown connected to the 50-60 Amp motor wires - the
indicator-light wire is typically 20 awg or lighter.  I suggest an in-line
fuse to protect that wire. > 
 
Bill Rumburg:
The light itself serves as a fuse. 
 
 Scott Krueger:
<2. While it is not shown in the diagrams, usually the relay coil power
comes from a fused/breakered source separate from the large motor
breaker...This is bad and has led to many relay problems in the past when
the motor breaker is pulled for electrical maintenance ... >
 
Bill Rumburg:
Although not shown, the relay coils are both fed from a single 5A Gear Relay
breaker connected to the main power bus (per the original Lancair diagram). 
Yes, a relay could inadvertently remain energized IF the Gear Pump breaker
was pulled AND the 5A Gear Relay breaker was not also pulled AND a low or
high pressure switch (corresponding to the position of the selector switch)
happened to close.
Yes, a foolproof way to avoid that would be to power the Gear Relay breaker
from the Gear Pump breaker OR you depend on the pilot's memory to always
pull (and reclose) the gear relay and pump breakers at the same time.
 
Bill Rumburg
N403WR