Return-Path: Received: from empnet.com ([208.44.70.3]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Fri, 29 Sep 2000 18:51:33 -0400 Received: from ronb (e-162-IP131.empnet.net [208.205.162.131]) by empnet.com (Postfix) with SMTP id 752952CB84; Fri, 29 Sep 2000 15:56:55 -0700 (PDT) Message-ID: <00dc01c02a67$a36558a0$6e01a8c0@ronb> From: "Kirk Hammersmith" To: Cc: "Technical Support" References: Subject: Re: VMS startup problem. Date: Fri, 29 Sep 2000 15:50:17 -0700 Organization: Lancair Avionics X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Subject: VMS startup problem. > > I like the idea of the small 12 volt battery... is there no way to use a > single switch though? To prevent the voltage drop-out problem on the VM 1000, you could use a 12 Volt SPDT relay (P&B or Bosch) and wire accordingly (12 volt aircraft) (from starter switch)----------------------(voltage while cranking)-----------> Pin #86 (from ground bus)--------------------------------------------------------------------> Pin # 85 (from 12volt battery source*)-------------(fused 7.5amp)---------------------> Pin #87 (to 12 volt input on VM 1000 DPU)----------------------------------------------> Pin #30 NOT USED------------------------------------------------------------------------ -----> Pin #87a * needs to be a source that doesn't drop out while cranking; pick it up at the battery or on the hot side of the master solenoid. Install a 1amp diode on each of the power input wires going to the VM1000 DPU (bands facing the DPU). This circuit would allow normal operation while master is on or while running. When starting, you are activating this relay which is continuing power supply to the DPU while cranking. The relay only operates while cranking. Kirk Hammersmith Lancair Avionics (541) 923-2244 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>