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david(at)carter.net
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 Posted: Fri Jun 11, 2021 7:04 am Post subject: Locking 3P switch? |
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Please see attached diagram. I'm looking for a better solution than what I'm showing now for the "test/kill" connection on the SDS CPI-2 ECU. I believe it would be better if this was on the same switch as the power to the ECU & coil, so that the "test/kill" connection would be grounded any time the ECU & coil power supplies are switched off. Grounding this connection causes the ECU to stop firing the coils/plugs.
When power is removed from the ECU & coil primary supply connections, the ECU remains on & automatically switches to the backup power supply. The manufacturer's intent is that this is supplied by a dedicated battery with an unswitched supply rather than the Z101 engine bus, but that's not relevant to the question at hand.
Can anyone suggest a locking 3 pole switch similar to the Honeywell NT series, or another creative way to achieve this with more common switches?
Thanks,
David
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David Carter
david(at)carter.net (david(at)carter.net)
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supik
Joined: 22 Aug 2018
Posts: 70
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| Posted: Sun Jun 13, 2021 9:27 am Post subject: Re: Locking 3P switch? |
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Hi David,
here is a 3 way, lockable, double pole switch from APEM. I'm selling these, feel free to send me a PM..
https://www.ebay.com/itm/164244841780
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Igor
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johnbright
Joined: 14 Dec 2011
Posts: 165
Location: Newport News, VA
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| Posted: Mon Jun 14, 2021 8:49 am Post subject: Re: Locking 3P switch? |
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Re "N87BP_Engine_Bus_Detail.pdf" of 11 June 2021
I'm not seeing a failure mode that keeps the engine running if the SDS CPI-2 backup power wires are connected to the engine bus.
There is however an SPOF in the form of the single connection to the engine bus. The Bussmann 15600 fuse block can be modified to add a 2nd stud... ref attached three photos. In the case of Z101, the diode feed from the main bus goes to one stud and the relay feed from the battery goes to the other stud.
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John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
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