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 EU07 double traction - compressors

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DB-47:
Hello everyone,

I have question or possible bug report for one certain behaviour when having double traction of EU07s. I have this consist EU07-477+EU07-1512+cargo wagons. After I unbraked trainset, I noticed after pressure drop in main reservoir, that only front locomotive's (EU07-477) compressor got running while second one's (EU07-1512) remained unactive as can be seen on provided screenshots (EU07-477 ... C and EU07-1512 ... c!) However when I had manually disabled compressor and had switched it on back after pressure dropped below 7,5 bar, both compressors started to run. The same behaviour I have also observed on ET42 (easily replicable), 2xEP05 and other EU07 derivates (EP07,EP08).

Does this behavior reflect the real world's behavior?

Best regards,
DB-47

Sojkolek:
Hi!
Did you ticked "Connector" option in "depot"?

Stele:
He did. There is [103] coupler flag on first screen.
Now I don't remember what exactly those exclamation marks acter "c" ment. In one time that was just preassure switch while in other cases that was fuse indicator. In first case, they might look only on local supply tank preassure and use only air from lead loco. In second case, fuse went off on second loko and you'd have to switch to it and reset it locally.

Farmadupe:
If I read the source code correctly, in the case of 2EU07, each locomotive will look only at its own main reservoir pressure when it decides when to activate the compressor. (Although if the locomotives are permanently coupled, then both compressors should activate at the same time?)

So assuming that only the first locomotive is supplying air into the brake pipe (and the brake handle of the second locomotive is in lockout position), I think it is possible that the main reservoir of the first locomotive will have slightly lower pressure, so the compressor of the first locomotive will activate and fill up the main reservoir of the second locomotive before the pressure gets low in the second locomotive.

Farmadupe:
I think the behaviour in real life may be different to Maszyna, it seems that there are several signals in the multiple unit connector related to compressor operation, including the pressure sensor "PG".

However to understand the correct logic I think it may be necessary to look at a relay diagram.

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