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How to build a 21st century protection board
How to build a 21st century protection board
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Old 14th November 2015, 12:27 AM   #1001
still4given is offline still4given  United States
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How to build a 21st century protection board
Quote:
Originally Posted by jwilhelm View Post
That looks better. You still have those dots in the silk though.
I got rid of some of them. Some are still a mystery. I will know to watch for them from now on. Too much into this one to worry about them. They are not hurting anything except the looks and all of them will be completely hidden once the parts are in place.
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Old 14th November 2015, 12:31 AM   #1002
jwilhelm is online now jwilhelm  Canada
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It's amazing how many hours can get burned up drawing a board. It does get much easier with practice though.
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Old 14th November 2015, 04:44 AM   #1003
kool lites is offline kool lites  Australia
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Default Truth Table 2

Terry your explanation would indicate the truth table would be as below.
It makes the tracks a little more complicated than needed, but works all the same.
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Old 14th November 2015, 05:52 AM   #1004
still4given is offline still4given  United States
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How to build a 21st century protection board
Yes that is correct except steps 3 & 4 are reversed. Inrush and Power overlap slightly.
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Old 14th November 2015, 06:02 AM   #1005
vzaichenko is offline vzaichenko  Russian Federation
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How to build a 21st century protection board
Quote:
Originally Posted by still4given View Post
Yes that is correct except steps 3 & 4 are reversed. Inrush and Power overlap slightly.
Exactly

0...0 - Power Off
0...1 - Inrush
1...1 - Overlap
1...0 - Power On
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Old 14th November 2015, 06:49 AM   #1006
kimschips is offline kimschips  Denmark
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Inrush relay is Constanly on when it's activated?
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Old 14th November 2015, 09:09 AM   #1007
kimschips is offline kimschips  Denmark
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Quote:
Originally Posted by still4given View Post
The "inrush" circuit switches on first to feed the mains voltage (120Vac) through a resistor to ease the inrush of current into to the filter caps. After about three seconds the "power" circuit switches on to bypass the resistor. After that the "Inrush" circuit switches off to relieve the inrush relay draw from the 12Vac transformer.
What do you mean by the inrush circuit switches off?
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Old 14th November 2015, 09:18 AM   #1008
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by still4given View Post
The "inrush" circuit switches on first to feed the mains voltage (120Vac) through a resistor to ease the inrush of current into to the filter caps. After about three seconds the "power" circuit switches on to bypass the resistor. After that the "Inrush" circuit switches off to relieve the inrush relay draw from the 12Vac transformer.
Quote:
Originally Posted by kimschips View Post
What do you mean by the inrush circuit switches off?
I hope that is not the way it works.
At Power ON the relays and controls should all be doing nothing.
The resistor current limiter should be in circuit.
Once the control circuit/s become active, the relay can activate to bypass the current limiting resistor/s. Thge relay is now active anmd draws coil energising current.
Quote:
Inrush relay is Constanly on when it's activated?
I see you asking a question, I will confirm that relay active after the delay is normal. Relay inactive (no current through coil) at start up and while power is OFF. This is the way most would design a control system.

A normal soft start (as different from a capacitor slow charge) is only needed until the transformer has built up it's operating flux to become a transformer, rather than a bundle of wire around a core. That start up for the transformer takes a few cycles of the mains waveform. It is generally recommended that the delay for the soft start be extended to be longer than 99ms.
Most adopt 100ms to 300ms. I can confirm that these delay timings all work.

There is no need to extend the soft start bypass delay to 3 seconds.
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Last edited by AndrewT; 14th November 2015 at 09:22 AM.
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Old 14th November 2015, 09:24 AM   #1009
kimschips is offline kimschips  Denmark
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I know how soft start works☺
Just a bit confusing now, i just read linear protection 1.1 There is a good explanation ☺
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Old 14th November 2015, 09:42 AM   #1010
AndrewT is offline AndrewT  Scotland
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Yes, I can gather from your post that YOU do understand.
It's the others that don't, or can't write their thoughts unambiguously.
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