@cjack posted:Do the PH135s have the same breaker circuit in them as do the PH180s?
No they do not.
Mike, I guess I mis-spoke...what I meant is that the PSX-1AC is FAR FAR SUPERIOR to the PH180 in the manner of notification that a short exists--sound and light. I find that valuable since my blocks are many and pretty carefully assigned, the PSX-1AC generally gets me awfully close to the problem. It works for me anyway. As has been stated several times in his thread, these things are not for everyone.
Don
I have four transformers, and when I lose power, it's pretty obvious which transformer tripped. I'm not sure I see how the PSX board is going to zero in any closer unless you're using a ton of them on each power drop to the track.
While some folks do not like the buzzer, I find it very useful. No matter what I am doing, if there is a short the sound immediately lets me know there is a problem. I also like the fact that when using the PSX's reset circuit, the power will not come back on until I'm ready, and the reset switch is easy to get at. One press, power is back.
I don't have to worry about doing anything with the PowerMaster or PH180.
I know there will be some who will come back and say how they don't need it, as with previous pro-PSX posts, but I say try it and you will like it.
Somewhat related here, QSI used to offer something called a Power Guard. It was a box with some TVS diodes and some LEDs that flashed when it sensed a spike. We used them on the clubs modular layout. If you have any doubts that TVS diodes are worth the trouble, think again. The LEDS would be flashing almost continually. The most common reason is dirty track coupled with worn pickup rollers bouncing up and down on the rails. They show up on the auction sites occasionally though really not more effective than a TVS diode, they could be a good tool for keeping track of the condition of your motive power and rails.
Pete
@Don Merz 070317 posted:The PSX-1AC is a cheap defense. We can discuss whether it's the first line or the second, but it's good insurance for me--saving just one loco repair repays the entire investment!
Don
Exactly my thoughts on the PSX-ACs. I like all the bells and whistles too, and there's nothing quite like the sound of a Sonalert going off!
@Norton posted:Somewhat related here, QSI used to offer something called a Power Guard. It was a box with some TVS diodes and some LEDs that flashed when it sensed a spike. We used them on the clubs modular layout. If you have any doubts that TVS diodes are worth the trouble, think again. The LEDS would be flashing almost continually. The most common reason is dirty track coupled with worn pickup rollers bouncing up and down on the rails. They show up on the auction sites occasionally though really not more effective than a TVS diode, they could be a good tool for keeping track of the condition of your motive power and rails.
Pete
For anyone interested, the first project in the 'OGR Electronics Projects List' is a spike detector that Stan2004 posted. Just below the spike detector is a neat little project forum member Rod Stewart made installing one of these in the roof of a caboose. Links to the original project postings are included for more details.
@Norton posted:I don’t see any way the PSX AC can be any faster than a 180 watt brick. This is for AC not DC. AC passes through zero 120 times a second. You can’t sense a short circuit when there is no current. Only as it approaches max voltage can it sense a change in current.
On a DC layout it can respond faster than 8 ms but not AC.
Folks are reporting no spark when shorting the circuit to test the PSX regardless of what the amp setting is. I like and depend on the PH 180 breaker too, but it can't shut of current that fast. How do explain that?
@turkey_hollow_rr posted:Folks are reporting no spark when shorting the circuit to test the PSX regardless of what the amp setting is. I like and depend on the PH 180 breaker too, but it can't shut of current that fast. How do explain that?
Simple, the PSX1-AC uses solid state switching to interrupt the current, the PH180, at least the older version, uses a relay to interrupt the current. So, think microseconds or less for the PSX and milliseconds for the PH180.
@Norton posted:I don’t see any way the PSX AC can be any faster than a 180 watt brick. This is for AC not DC. AC passes through zero 120 times a second. You can’t sense a short circuit when there is no current. Only as it approaches max voltage can it sense a change in current.
On a DC layout it can respond faster than 8 ms but not AC.Folks using these after a modern transformer, they are really only useful if you want to limit the current on a section to less than ten amps which is what a modern higher power transformer of at least 180 watts trips at.
Want to turn your Post War ZW into a modern transformer? Use a PSX1-AC.
Pete
Thinking about this, I don’e see a 8 ms issue for AC. True if a derailment occurs when there is no current, but then as the current rises and reaches the set current limit of the PSX, then the PSX will trip faster at that moment than a PH180 which has a relay in it. So yes, the PSX can respond faster than 8 ms…but not until it has to.
@Norton posted:I don’t see any way the PSX AC can be any faster than a 180 watt brick. This is for AC not DC. AC passes through zero 120 times a second. You can’t sense a short circuit when there is no current. Only as it approaches max voltage can it sense a change in current.
There is no current flowing only during those zero crossings, the rest of the time, the current is proportional to the load and voltage. During a short, the resistance drops to near zero, and current will rise to infinity. Obviously, thats not possible, but it does rise well above the trip point.
My guess is that the PSX-AC can trip about as fast as the sample rate allows it. Assuming the device is sampling the current somehow.
@O Scale Ange posted:I have four that I use to protect four districts on my layout. They are hooked up after two legacy ZW-L's. I run command only. I added the sonic alarm and wired in a control panel overload led that activates when the alarm sounds. These work great!
Ok I HAVE to ask what and where did you get those panel meters for voltage and amperage?
@zhubl posted:Ok I HAVE to ask what and where did you get those panel meters for voltage and amperage?
Not to mention the Atlas switch controls. I understood there was a relatively easy-to-fix issue with those controls. I wish Atlas would do the fix and put them back on the market. They are much nicer than the standard Atlas #56 switch control box.
@gunrunnerjohn posted:Simple, the PSX1-AC uses solid state switching to interrupt the current, the PH180, at least the older version, uses a relay to interrupt the current. So, think microseconds or less for the PSX and milliseconds for the PH180.
Exactly. I know you know, I know I know, and I'm sure some others know. But there seems to be reluctance by still another group to believe that is it possible for a micro processor to sense and cut current in sub-millisecond time intervals.
Those panel meters are RRAmpMeters, another product from the makers of the PSX-AC, DCC Specialties. Unfortunately for us in O gauge, we need the RRAmpMeter model IV for the higher current and the most expensive. Haven't done it yet, but I'll probably end up with one (maybe more?) someday. For some time now, I've been curious as to what they are like (in person) and how well they work.
@zhubl posted:Ok I HAVE to ask what and where did you get those panel meters for voltage and amperage?
rtr12 was correct. The panel meters are RRAmpMeters, another product from the makers of the PSX-AC, DCC Specialties. I purchased them from Tonys Train Exchange more than a few years ago, along with the PSX-1-AC. They work great as well.
@PGentieu posted:Not to mention the Atlas switch controls. I understood there was a relatively easy-to-fix issue with those controls. I wish Atlas would do the fix and put them back on the market. They are much nicer than the standard Atlas #56 switch control box.
I purchased the Atlas switch controls long before the recall on those. Since most of the Atlas switches on my layout are kind of long, #5, #7.5 and the Double slips, each one is using an Atlas 6924 relay along with the #57 switch controller. I hooked all this up many years ago with the help of Steve Horvath. Steve is a great guy and a great help to me in learning how wire all the Atlas switches and hook them up. I met him at York back around 2014. When he came out to Jersey, (from Montana) to visit family he spent some time with me here at my house.
I'm curious where others have mounted the external LEDs (power input on, power output on, power interrupted) and reset button on their layout. Did anyone create a mountable box?
Well doggone it turkey hollow, science sure got some bad press in the USA from 2016 through 2020--but surely not ELECTRONIC science I hope? I still want to believe in electronic science. It's important to me...
Don
@Don Merz 070317 posted:science sure got some bad press in the USA from 2016 through 2020
Don
Don, I don't think they're done with science as we know it. But I noticed they've started picking on "infrastructure". 
So, this was your thread that seems to be winding down, what are your thoughts on how you may proceed?
