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carlrai(at)aol.com
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 Posted: Sat Jun 23, 2007 3:04 am Post subject: GRT-EIS Tach input |
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Fellow Builders,
Currently close to completing wiring on an RV-9A. Among the last of the connections to complete are the tach input to the GR EIS.
I'm going to connect both mags to the input, using a switch to select L or R input for RPM drop at runup. Two toggle switches are used for the L and R mag on/off.
Do I need to connect the tach input directly to the mags using a seperate shielded wire or can I simply use a double faston tab at the toggle switch to continue the mag wire to the EIS input? I assume if a continuation is acceptable, it should also be shielded with the shield grounded at the mag switch end - for noise only, not as part of the grounding circuit to shut down the mags.
Any and all suggestions are appreciated.
Carl Raichle
Lutz, FL
AOL at AOL.com.
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peter(at)sportingaero.com
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| Posted: Mon Jun 25, 2007 2:17 pm Post subject: GRT-EIS Tach input |
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The tach input to the EIS is fine if it comes from the back of the mag switches. Don’t forget to put the 27Kohm resistors in series from mag switch to input change over switch. Doesn’t need to be shielded, but probably won’t hurt. See Bob’s notes on grounding P leads (IIRC should not be connected to earth at the mag switch end), any continuation wire should be grounded at one end only – probably EIS end – and will not form any part of the mag grounding circuit. The purpose of the 27Kohm resistor is to make sure that’s so.
Pete
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