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YD7432 Reverser - recommended length of the Sensor track

 

I've just started implementing two YD7432 reversers each using S1 and S2 sensors.
What is the recommended (or minumum) length for each of these isolated track sections for a correct operation? I know that the the "Track Out" must be as long as the longest train, but could find no mention about the length of the shorter sensor sections.
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Track is not yet laid so I can still adjust the plan according to your answer. Thanks in advance.
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longest Loco's length to be on the safe side.
 

I have it tested here with only 10cm length in H0. Also works, but that pre-requires your sections adjacent to S1 and S2 to also be suplied with a currecnt sensor.?
 

OK thanks Karst. My layout is also 00/H0 and the longest locomotive is about 28cm so with S1 and S2 planned at approx. 60cm each and the Track Out still having a length of over 4m I'm well within the specs.
All other track sections are supplied using YD6016 / DR4088 current sensors.
 

Ok, great setup ??
 

@karst.drenth
Could you please elaborate why it matters to have "sections adjacent to S1 and S2 to also be supplied with a current sensor" ?
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In a reversing loop, sections S1 and S2 are usually next to the turnout, which is not necessarily supplied from a detector (as it is not part of "monitored track", at least in TrainController).
I am currently using Litffinski reverse loop modules in combination with ESU 50094 detectors. In this case: S1/S2 sensor tracks are short (5-20 cm) and not monitored, only the loop between them.
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I am considering your YD7432 Reverser modules for my additional loops.
Do you think they will work with ESU ECoS when connected via S88 for occupancy monitoring?
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You ask whether the YD7432 will work when “connected via S88 for occupancy monitoring” – the YD7432 uses LocoNet to provide the occupancy reporting, not S88 ?

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From: [email protected] <[email protected]> On Behalf Of TrainZeal via groups.io
Sent: 08 January 2025 01:59
To: [email protected]
Subject: Re: YD7432 Reverser - recommended length of the Sensor track

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@karst.drenth

Could you please elaborate why it matters to have "sections adjacent to S1 and S2 to also be supplied with a current sensor" ?

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In a reversing loop, sections S1 and S2 are usually next to the turnout, which is not necessarily supplied from a detector (as it is not part of "monitored track", at least in TrainController).

I am currently using Litffinski reverse loop modules in combination with ESU 50094 detectors. In this case: S1/S2 sensor tracks are short (5-20 cm) and not monitored, only the loop between them.

?

I am considering your YD7432 Reverser modules for my additional loops.

Do you think they will work with ESU ECoS when connected via S88 for occupancy monitoring?

?
 

On Tue, Jan 7, 2025 at 06:01 PM, TrainZeal wrote:
Could you please elaborate why it matters to have "sections adjacent to S1 and S2 to also be supplied with a current sensor" ?
They don't have to be detected, but have at least the same voltage drop (1.1V) as the sensor tracks are measuring for. You also can (or better should if you have more Current-Sense detection ) power your turnouts through some anti-parallel diodes ( two in each direction ) By the way, doing so also imporves feedback reliability of other Current-Sensed section adjacent to turnouts.

In a reversing loop, sections S1 and S2 are usually next to the turnout, which is not necessarily supplied from a detector (as it is not part of "monitored track", at least in TrainController).
I am currently using Litffinski reverse loop modules in combination with ESU 50094 detectors. In this case: S1/S2 sensor tracks are short (5-20 cm) and not monitored, only the loop between them.
The YD7432 monitors all of it's sections, to be able to provide a complete, 2-way, block for control software.? S1 and S2 serve as "incoming" feedbacks, T.O. as occupation.

I am considering your YD7432 Reverser modules for my additional loops.
Do you think they will work with ESU ECoS when connected via S88 for occupancy monitoring?
Well that is a story by itsself... I designed the YD7432 to indeed have an s88 Bus... and I did that after consulting ESU whether their s88 Bus is galvanically isolated from the Track-Power. The Answer: Yes it is !
But then reality struck... As we finished the YD7432 it indeed worked very nicely on the ECoS ... until... you turn on track power... Then the feedbacks went bozo. ==> Not a 100% galvanic Isolation between track ground and s88 :'(

So unfortunately it does not work through the? ECoS' s88 bus. It works brilliant however with the ESU L.Net converter.

Greets,
Karst
 

@karst.drenth:
Your timely reply is very much appreciated. I will follow your advice and will be ordering YD7432 Reversers as well as an ESU L.Net converter.
Also, I am looking into connecting mon-monitored sections through two diodes in each direction as you suggested. So far I have not observed any voltage drop on sections monitored by ESU 50094 Detectors. But that might be because I was measuring on open circuit.?
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@Iain Morrison:
Thanks for trying to help. The reason I was asking about occupancy detection reporting via S88, is because this functionality is in the specs on yamorc.de page for YD7432 Reverser. According to the page the reverser's reporting capability via enhanced S88 is the same as via LocoNet. The problem, it appears, is in the ECoS which ?does not have galvanic isolation between the track ground and its s88 interface.

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