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NCE EB1 Circuit Breaker - is anyone using these with a YD7001 and DR5033 boosters ?

 

Hi
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My club, York Railway Modellers, purchased several NCE EB1 circuit breakers and we cannot get them working with our YD7001s and the DR5033 boosters without increasing the circuit breaker trip time in the command station and boosters to 300 ms (default is 96 ms).? I am concerned that setting the circuit breaker trip time in the command station and boosters to 300 ms could lead to damage to them or the decoders in the locomotives.
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Has anyone else used the EB1 with the YaMoRC command stations and the Digikeijs boosters?? If yes, could you let me know you set the CV in the command station and boosters.
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Thank You.? Jay Lennox.?
 

Jay,
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I have not used this combination before, but I have a couple of thoughts. What have you set the trip time on the NCE EB1 circuit breaker? I think the minimum setting is ~10ms. Can you try the minimum setting and see if it improves performance?
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Thanks,
Stuart
 

I use a couple of NCE EB1 with my Z21 in the accessory bus ?and only changed the current trip to 2.5A to ensure the EB1 trips before the Z21 or the booster. I wonder if you have reduced the current trip on the EB1?

Don’t seem to have any issues.?


Many Thanks

Iain Morrison


On Thu, 27 Mar 2025 at 16:51, Stuart Baker via <stuart_w_baker=[email protected]> wrote:
Jay,
?
I have not used this combination before, but I have a couple of thoughts. What have you set the trip time on the NCE EB1 circuit breaker? I think the minimum setting is ~10ms. Can you try the minimum setting and see if it improves performance?
?
Thanks,
Stuart
 

Stuart
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The trip time on the EB1 is controlled by CV130.? I have set CV130=1, which should give a 16 ms trip time.? In theory CV130 =1 when shipped from NCE - I purposely set it to make sure it was 1 after it did not work out of the box. To get the EB1 to trip before the DR5033, it had to set the DR5033 trip time to 300 ms - at 225 ms the DR5033 trips before the EB1.? I know this makes no sense.? Still investigating.
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Iain
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Good to know you have an EB1 working with a European brand command station.
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I have set the EB1 trip current at 2.2A - it is the 1.1 version of the EB1 and the trip current options we have are 1.5A, 2.2A, 3.3A, 4.1 A, etc.? We have the DR5000 set to supply the maximum 3000ma, or 3A in the configuration variables, so the maximum trip current I can set on the EB1 is 2.2A.
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Testing methods;
  • I am only doing testing on the workbench, using a momentary switch on the track outputs to simulate a short. The EB1s need to work when I install them on the layout to avoid disappointed club members :-)
  • I have tested with the YD7001 directly and used two DR5033s in combination with the YD7001 - same results.
  • I have tested these combination with two EB1s to ensure one is not faulty - same results.
I have spent about 12 hours over the last 10 days working on this.? I have a problem open with NCE support, but they have not been very helpful except to tell me that the EB1 always works as stated (which is exactly why the club decide to go with the EB1 so that we could isolate our yards from the mainline).
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Things I plan to try
  • Change CV130 to say 4, which should give a trip time of 64 ms, and then see how low I can make the DR5033 trip time.??
  • Add a Digitrax command station to the testing mix to see if the problem has something to do with the combination or YaMoRC plus Digikiejs and the EB1 - a long shot, but needs to be tested.
If you have any other thought please let me know.? ?Thank You.? Jay Lennox
 

It could be you're experiencing 'switch bounce'; no switches close in one clean motion, but instead bounce open & closed multiple times in a multiple msec or tens of msec interval before staying closed. Slow logic does not see this, but fast logic can. It could be that the EB1 is being fooled. Try? a different method of creating a short & see if anything changes.

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