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klehman(at)albedo.net
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 Posted: Thu Jul 30, 2009 11:41 am Post subject: Z-20: Fuse Links, Master Switch, Alt OV Disc. and OVM |
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Too many questions at once makes it daunting for one guy to tackle
quickly Dan. I'll take a go at the second part of your post. Maybe
someone more familiar with Z-20 will answer the first part. If not, post
the questions again that you still have.
Yes on the crowbar operation. The black box is very quick. But in
addition, the crowbar black box will trip the Circuit breaker to keep
the power off. Resetting the breaker will reset the circuit.
Alternator OV disconnect. With no power to the relay the alternator is
disconnected. Energizing the relay connects the alternator. The NC and
NO terminology has a history in electronics where normal means the
condition when the coil is not energized. No reference to airplane
operation.
Dynamo aka PM alternator. These units generate AC power not DC so they
need the two wires. The regulator also rectifies the AC into DC and then
regulates the DC output voltage.
Capacitor. Yes it will help filter noise. It also may assist the stable
generation of power if the battery fails or is disconnected. In my
machine I do not have the ability to disconnect the PM voltage regulator
from the battery and I do not have a capacitor and it all works just fine.
Ken
| Quote: | Crowbar OVM
In Z-20, the crowbar OVM is shown sharing terminal 4 of the master
power switch with the line to the alternator. For me, the crowbar OVM
is a black box. All I need to understand is what the 'net' function
of it is. When it senses a voltage above a certain value, does it
allow a current path to be completed through it to the panel ground?
If so, then there would be no current going to the alt OV disconnect
relay, which would then take the alternator offline. Is that how it
works?
Alternator OV Disconnect Relay
Am I right in assuming that in the normal engine operation with the
power master switch in the 'up' position, the power is applied
through the switch to the alternator OV disconnect relay, whose
magnetic field then pulls down the alt OV switch from the N.C.
position to the N.O. position? That had me confused at first, cuz I
figured 'normal' operation is when both the alternator and battery
are connected. I think I can interpret 'Normally Open, Normally
Closed' as being the 'unenergized' switch position, right?
Dynamo, aka PM Alternator
Z-20 shows just two wire coming off the alternator. One connects to
the voltage regulator at terminal 3, the other at terminal 1. There
is also a tach signal wire spliced into the terminal 1 wire. So both
of these wires are carrying current generated by the alternator to
the voltage regulator? If so, why have two leads instead of one, and
shouldn't there be a ground someplace?
Capacitor
Is the capicitor after the regulator for filtering out noise to the
radio? I know of someone who wired according to Z-20, but left out
the capacitor. I'm not sure why.
Cheers, Dan
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messydeer
Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA
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| Posted: Thu Jul 30, 2009 3:29 pm Post subject: Re: Z-20: Fuse Links, Master Switch, Alt OV Disc. and OVM |
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Thanks, Ken 
I'll post another topic with the any questions I still have in a few days. Chopping the topic up into smaller pieces is a good suggestion.
Cheers,
Dan
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