Powerhouse lockon

 

 It’s my understanding the powerhouse lock on is to protect the electronics circuits in newer engines with digital circuit boards.

I read that in order for the powerhouse lockon to work it needs 12 V AC. Min.

So if I am running a new digital locomotive in conventional mode on that track  I would not have protection from a short circuit when running at low speeds (below 12v).  Am I right?

 

Original Post

The TMCC Direct Lockon is ONLY designed to run with constant power for command operation.  It does not function below about 10-11 volts, and you'll simply lose track power.

There are better ways to protect your locomotives.

The PowerHouse 180 has an excellent circuit breaker, I've felt no need to augment it.  I'd just add a TVS suppression diode across the track feeds and run trains, that's what I do.

The TVS diode protects against voltage spikes caused by collapsing electromagnetic fields generated by the layout (relays, solenoids, motors, derailments etc).

A short video about those spikes:

Since the source is layout side, you want the protection layout side. Many people put them on the track, others put them on the output terminals of the transformer, and some do both!

With a ZW, it is easy to take 4 TVS diodes, shape them like this so they wrap around the binding posts, (A-U, B-U, C-U, D-U).

 

For our trains we recommend two models of TVS:

For power supplies in excess of 18VAC use the 1.5KE36Ca diodes.

If you only use supplies that are limited to 18 VAC then you could get by with 1.5KE33Ca diodes.

gunrunnerjohn posted:

The TMCC Direct Lockon is ONLY designed to run with constant power for command operation.  It does not function below about 10-11 volts, and you'll simply lose track power

I had never known about that before. That explains Mom's train jackrabbit starting after my brother took off with the command control, lol. You saved me (cost me ) a day on Moms carpet I bet.

ironman1 posted:

I guess I need to digest this.

Not really, they are cheap additional insurance, not a plan changer.

 Continue with whatever plans you have so far for command and just pickup extras before you plan your next huge derailment

You could go nuts and add them to each each loco and accessory, or just one per throttle, block. ..

. Mine has had PLENTY of derails without them.   BUT.. I don't care about the command either. 

 If one toasts, I'll bypass the command happily.

oops....I forgot I do have one on one track now, but thats it.

"Still trying to not shoot my eye out"

 

"Nursing insomnia one railcar at a time"

My aroma therapy? Smoke Pellets.

 





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