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esco
Joined: 11 Jan 2023
Posts: 5
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 Posted: Fri Jan 26, 2024 12:06 am Post subject: Z-12N based architecture review request |
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Team: I’d appreciate a review of my first draft architecture, based on Z-12N. Any credit goes to Mr. Nuckolls and many contributors; any errors are mine.
Aircraft: Vans RV-14A
Mission: IFR cross-country
Engine: electrically dependent (SDS EFI/I) IO-390.
Electric Power:
-main: B&C 60a externally regulated alternator
-backup: Monkworkz MZ30L 30a externally regulated generator
-battery: EarthX ETX900, approx 50 min power for engine bus only (18.6ah (at) 1c rate.)
Electric Load Analysis:
-Engine bus: <14a for SDS dual ECU, coils, injectors, fuel pumps...
-Main bus estimates: <35a max draw (avionics, flap motor, fans, lights...); <8a steady state; still working the "minimum essential avionics" estimate
I have considered Z-13, Z-14, and Z-101; 12N seems the best fit for my mission, skills, and planned equipment.
thank you
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| Filename: |
20240125_Z12N_Schematic_v3.pdf |
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1.66 MB |
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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| Posted: Fri Jan 26, 2024 3:15 pm Post subject: Re: Z-12N based architecture review request |
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The Monkworkz MZ30L is NOT wired like most alternators. Read the installation manual.
https://docs.google.com/document/d/1BckaSN06Lv4BYY07AfHk3YRvx8b60yybpX0qHB-Mymc/edit
Below is my interpretation of the owner's manual.
ALL of the wires from the MZ30L go to its regulator and no place else.
Not counting the wires between the generator and regulator, a minimum of 4
wires are required to be connected to the regulator. Regulator pins 1 & 6 go to
an enable switch. Regulator pins 17 & 18 go to the main power bus and ground
respectively. 10AWG wire could be used for pins 17 & 18. The fuselink would
then be 14AWG.
The other pins on the regulator are optional and are for an external indicator
light and signal outputs to a customer supplied ammeter.
The Monkworkz MZ30L is self current limiting. If overloaded, the output voltage
will automatically decrease to limit the current.
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Joe Gores |
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esco
Joined: 11 Jan 2023
Posts: 5
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| Posted: Fri Jan 26, 2024 5:06 pm Post subject: Re: Z-12N based architecture review request |
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Joe: thank you very much for the review.
I've read the Monkworkz installation manual a few times, and I'm working out the integration required. Bill Judge is very clear about the need to connect to the switched side of battery contactor- that is one of the reasons I chose the Z12 as a model.
As I learn and refine this, I'll add more details.
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esco
Joined: 11 Jan 2023
Posts: 5
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| Posted: Sun Jan 28, 2024 9:42 pm Post subject: Re: Z-12N based architecture...for RV-14A |
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Overview architecture updated to include MonkWorkz-specified installation.
Engine bus (approved by SDS) also attached.
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20230118 Eng Bus Schematic v1.1 .pdf |
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106.71 KB |
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102 Time(s) |
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20240128 Z12 140455 V2.pdf |
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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| Posted: Mon Jan 29, 2024 5:31 am Post subject: Re: Z-12N based architecture review request |
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Esco, your schematic shows 4 wires going from the MZ-30L generator to the aircraft electrical system.
The MZ-30L installation manual shows ZERO wires going from the MZ-30L generator to the aircraft electrical system.
All of the wires from the MZ-30L generator must ONLY go to the regulator. None go to the aircraft.
Only the regulator has wires going to the aircraft electrical system. The generator puts out 3 phase AC.
Therefore it can NOT be connected directly to the aircraft DC electrical system.
The generator can only be connected to the rectifier / regulator.
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Joe Gores |
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esco
Joined: 11 Jan 2023
Posts: 5
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| Posted: Mon Jan 29, 2024 7:52 am Post subject: Re: Z-12N based architecture review request |
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Joe: thank you very much!
You're absolutely correct.
I read the installation manual, specifically "2.2. Minimum Installation / Required Connections" several times... and still misunderstood. I'll make the updates tonight!
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esco
Joined: 11 Jan 2023
Posts: 5
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| Posted: Mon Jan 29, 2024 4:49 pm Post subject: Re: Z-12N based architecture review request |
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Revised to show MZ30L: all aircraft connections at regulator only.
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| Description: |
| Added MonkWorkz installation schematic |
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Download |
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20240129 Z12 140455 V3.pdf |
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297.96 KB |
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user9253
Joined: 28 Mar 2008
Posts: 1925
Location: Riley TWP Michigan
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N1921R
Joined: 31 Jan 2024
Posts: 8
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| Posted: Wed Jan 31, 2024 10:57 am Post subject: Re: Z-12N based architecture review request |
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| esco wrote: | | ... Bill Judge is very clear about the need to connect to the switched side of battery contactor... |
It is not necessary to connect the Monkworkz regulator current output to the switched side of the master contactor/main bus, only that it be disconnected from the battery somehow while parked to prevent its parasitic load from depleting the battery.
I show it connected to the engine/essential bus which is on the forward side of the firewall. This way the engine will run with the main bus offline, for instance in the smoke in the cockpit scenario. Snip attached. More complete PDF schematic in folder 1) / A) here
The OP has seen this but maybe others have thoughts.
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373.17 KB |
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John Bright, RV-6A N1921R, working on FWF.
Single battery, alternator on main bus, Monkworkz generator on engine/essential bus.
My links here |
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