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  #1  
Old 03-22-2021, 07:01 AM
rockitdoc's Avatar
rockitdoc rockitdoc is offline
 
Join Date: May 2020
Location: Fort COllins, CO
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Default PMag Switches

I would like to have the left and right PMag 'On' and 'Test' switches in one toggle switch each. I am going with a starter button instead of a key with left, right, both and start functions. The two switches would function having the first position, or down, 'Off' (no power to Pmag); the middle position 'On' (ship power to PMag); and the up position 'Momentary On' (ship power off, internal Pmag power on).

I have found many switches where the middle position is 'Off' with 'On' and momentary 'On' in up and down positions, but none appropriate for aircraft with an Off-On-(On) configuration.

Has anybody wired their system this way? What do you think of the idea?

S
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  #2  
Old 03-22-2021, 07:13 AM
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rockitdoc rockitdoc is offline
 
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I think I found it from Stein. Should have looked harder.

https://www.steinair.com/product/loc...est-on-on-mom/
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Begun 07-23-20
Emp Completed 11-12-20
Slo Fuse Completed 3-2-21
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QB Wings delayed until ?
Finish Kit expected 7-21
Thunderbolt EXP119 expected 7-21
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  #3  
Old 03-22-2021, 07:34 AM
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Walt Walt is offline
 
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Location: Dallas/Ft Worth, TX
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Default

Quote:
Originally Posted by rockitdoc View Post
I would like to have the left and right PMag 'On' and 'Test' switches in one toggle switch each. I am going with a starter button instead of a key with left, right, both and start functions. The two switches would function having the first position, or down, 'Off' (no power to Pmag); the middle position 'On' (ship power to PMag); and the up position 'Momentary On' (ship power off, internal Pmag power on).

I have found many switches where the middle position is 'Off' with 'On' and momentary 'On' in up and down positions, but none appropriate for aircraft with an Off-On-(On) configuration.

Has anybody wired their system this way? What do you think of the idea?

S
I like to keep it really simple for me and my customers, so I just install standard (locking usually) toggles for L/R ignition and breakers above those switches for the Pmags if they are using them. I think the 3 pos switches get confusing on exactly whats going on, takes too many brain cells.

With breakers is really obvious, pull the breakers and do a mag check.
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Last edited by Walt : 03-22-2021 at 03:08 PM.
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  #4  
Old 03-22-2021, 08:09 AM
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rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 3,751
Default 3 pos switch

I'm using the honeywell 3 position switches which work great, and are very high quality. One for each pmag.

https://vansairforce.net/community/s...0&postcount=55

Up is normal - pmags "active" and 12v to pmag
Middle is "pmag internal generator test" so pmags active with no 12v power
Down is off - no power and pmags grounded (inactive)

It's almost idiot-proof I think.

To do maintenance on the pmag I have another switch far on the other side of the panel that has an indicator light that shows the pmag has power for maintenance/timing.
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  #5  
Old 03-22-2021, 09:39 AM
rapid_ascent rapid_ascent is offline
 
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I have 2 PMAG test toggle switches (Honeywell TL series) which are normally on and then momentary for the test position. That way they are normally on without me doing anything. I have a standard Cessna style rotary ignition/start switch.
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  #6  
Old 03-22-2021, 10:36 AM
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Default Switches

Quote:
Originally Posted by rapid_ascent View Post
I have 2 PMAG test toggle switches (Honeywell TL series) which are normally on and then momentary for the test position. That way they are normally on without me doing anything. I have a standard Cessna style rotary ignition/start switch.
Do you know the specific Honeywell switch part number?
Off-on-momentary?
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  #7  
Old 03-22-2021, 11:05 AM
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Carl Froehlich Carl Froehlich is offline
 
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Location: Dogwood Airpark (VA42)
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Default

Make this easy. I use a nice locking toggle switch for ignition On/Off, and a pull breaker to provide power. The periodic tests to make sure the internal alternator is working is just momentarily opening the breaker.

I find this series of locking toggle switches to be of good quality and have a nice feel: https://www.alliedelec.com/product/n...21al/70192231/

Carl
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  #8  
Old 03-22-2021, 02:33 PM
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GeoffP GeoffP is online now
 
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Default 1TL1-8F

Quote:
Originally Posted by wirejock View Post
Do you know the specific Honeywell switch part number?
Off-on-momentary?
Larry, I bought Honeywell 1TL1-8F switches for this purpose (with a rotary switch for main ignition/start). Technically they're an ON-(ON), just don't connect to the momentary ON terminal. They've got a locking detent so you've got to consciously pull out & up to test, once released (i.e. by default) the P-Mag is on.
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  #9  
Old 03-22-2021, 04:03 PM
rapid_ascent rapid_ascent is offline
 
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Location: Dublin, CA
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I used the 1TL1-4. Here is a link to Digi-Key. I didn't see the need for the locking switch. The PMAG is supposed to keep working either way so I didn't think it was needed.

https://www.digikey.com/en/products/...hoCAzcQAvD_BwE
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RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
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Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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  #10  
Old 03-22-2021, 05:14 PM
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Veetail88 Veetail88 is offline
 
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My 8 is configured EXACTLY as you describe. Works great. Simple fast test of p lead and internal alternator function. 1800 RPM, right mag off (right switch down) tests right mag p lead. Temporarily push the left switch up killing power to the left pmag tests the right pmag internal alternator. Back to both (move right switch back to center on position) reverse the procedure for the pmag. Done in just a few seconds and simple.
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