Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Mon, 01 Mar 2004 09:52:02 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3052447 for lml@lancaironline.net; Mon, 01 Mar 2004 08:44:15 -0500 Received: from Sky2high@aol.com by imo-m23.mx.aol.com (mail_out_v36_r4.14.) id q.68.3bb257a5 (3310) for ; Mon, 1 Mar 2004 08:44:11 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <68.3bb257a5.2d74982a@aol.com> X-Original-Date: Mon, 1 Mar 2004 08:44:10 EST Subject: Re: [LML] Re: LNN issue 45 - wiring LNC2 hydraulics with Bosch relays X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1078148650" X-Mailer: 9.0 for Windows sub 4042 -------------------------------1078148650 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Further to the wiring diagrams. 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. 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. Sometimes the coil breaker/fuse is shared with other minor devices. This is bad and has led to many relay problems in the past when the motor breaker is pulled for electrical maintenance, stopping the motor bursts from reacting to a hydraulic leak, releasing the pressure on the ground or other reasons WITHOUT deactivating the relay power source. This has caused relay failures after an intermittant relay is "picked" for a long period of time (especially true of the Ford relays). The relay fuse or breaker should be cascaded (wired) after the motor breaker so that when the moter breaker is pulled (deactivated) the WHOLE hydro-electric system is removed from any power source. Note that the "indicator" light will not show an engerized relay because the power for the light is from the motor power source. 3. An alternative relay wiring could have an Up and a Down indicator light wired from each relay coil or separate contacts on the relay so that it would be known that the relay was selected even though the motor was not powered. Note that the term "motor" was used in deference to Gary. Scott Krueger AKA Grayhawk Sky2high@aol.com II-P N92EX IO320 Aurora, IL (KARR) "...as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns - the ones we don't know we don't know." D. Rumsfeld -------------------------------1078148650 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Further to the wiring diagrams.

1. Usually, a full bridge rectifier is capable of carrying quite a bit=20= of=20 current (20A?) and is shown connected to the 50-60 Amp motor wires - the=20 indicator-light wire is typically 20 awg or lighter. I suggest an in-l= ine=20 fuse to protect that wire.

2. While it is not shown in the diagrams, usually the relay coil=20 power comes from a fused/breakered source separate from the large motor= =20 breaker. Sometimes the coil breaker/fuse is shared with other minor=20 devices. This is bad and has led to many relay problems in the past wh= en=20 the motor breaker is pulled for electrical maintenance, stopping the motor=20 bursts from reacting to a hydraulic leak, releasing the pressure on the=20 ground or other reasons WITHOUT deactivating the relay power source.&nb= sp;=20 This has caused relay failures after an intermittant relay is "picked"=20= for=20 a long period of time (especially true of the Ford relays). The r= elay=20 fuse or breaker should be cascaded (wired) after the motor breaker so t= hat=20 when the moter breaker is pulled (deactivated) the WHOLE hydro-electric= =20 system is removed from any power source. Note that the "indicator" lig= ht=20 will not show an engerized relay because the power for the light is from the= =20 motor power source.

3. An alternative relay wiring could have an Up and a Down indicator li= ght=20 wired from each relay coil or separate contacts on the relay so that it= =20 would be known that the relay was selected even though the motor was not=20 powered.

Note that the term "motor" was used in deference to Gary.=20

Scott Krueger=20 AKA Grayhawk
Sky2high@aol.com
II-P N92EX IO320 Aurora, IL=20 (KARR)

"...as we know, there are known knowns; there are things we kn= ow=20 we know. We also know there are known unknowns; that is to say we know there= are=20 some things we do not know. But there are also unknown unknowns - the ones w= e=20 don't know we don't know." D. Rumsfeld

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