Re: Increasing the DR5033 Short Circuit Delay to 300ms - what problems could happen ?
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Karst,
Note: I simply cannot understand why one would install such breakers.
The YD and DR power devices really are fast enough to adequately turn
off the power in case of a short.
Typically it comes from a desire to break up a layout into smaller power blocks than is strictly necessary based on booster power output. The breaker is less expensive than a booster and some can do auto reverse. The desire for finer granularity is usually driven by operating sessions where you don't want everyone on the power district impacted by one operator who tries to drive through a switch turned against them. But you could make the argument that it would be more elegant to use a booster for all of these smaller blocks, it would just cost you more money and you would have a lot more power supplies unless you cobbled together some sort of power distribution.
Regards,
Bob Gamble
On Wed, Apr 2, 2025 at 9:44?AM karst.drenth via <karst.drenth= [email protected]> wrote: On Sun, Mar 30, 2025 at 02:35 PM, Jay Lennox wrote:
Further, what would be the risks of doing this ??
Well... first I think one should solve the cause, not the symptom. Obviously the cause is that that ominous circuitbreaker does not come after it's specs... ;)
It will take longer for the DR5003 to detect a short, and hence power will be applied for 3 times as long at the site of the short,
?
Almost... the 5033 will detect immediately the short, it will "just" retry applying power until the short-delay expired. This could lead to a kind of low duty-cycle of power, since the re-engaging delay is set to about 10ms. it "could" be that because of this the circuitbreaker does not trigger...
which leads to a longer heating danger to whatever is causing the short.?
?
Correct, but not with the full power as described above. Mostly the power-pickups on the trains can take damage from this, since they are usually made of very thin material. I have seen them really glow yellow on certain Lima models...
Are there real risks to decoders installed in locos, etc ??
?
if the short is cause by the decoder, it is probably already too late. otherwise, shorts usually happen before the power enters the decoder.
Any other risks that anyone can think of ?
not that I can think of.
Greets,
Karst
Note: I simply cannot understand why one would install such breakers. The YD and DR power devices really are fast enough to adequately turn off the power in case of a short.
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- Bob
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Bob Gamble