Author Topic: Setting top speed with Lenz decoders?  (Read 396 times)

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Cajonpassfan

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Setting top speed with Lenz decoders?
« on: June 01, 2018, 10:06:54 PM »
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How does one set the top speed in early Lenz decoders?

Back around 2000, I hardwired two Lenz decoders in a Kato PA ABA set A units (the B unit is a Kato shell on a LL dummy chassis, with an early Soundtraxx sound decoder and a *ooooge* vertically mounted speaker).

I recently dug these up to run them, and while the motor control is excellent, their top speed is way too high. I've since got in the habit of limiting all my passenger power to 50 smph; that was the limit on the fast sections of Cajon trackage, and mostly run them much slower than that. Unfortunately, these decoders don't seem to support Vmax, and I don't have the documentation (or have it lord knows where) :facepalm: I don't even know which version of Lenz decoder they are... But I have pictures!

So, anyone here have any idea how (or whether) it's possible to set top speed on these? Lenz info talks about "trim" but it's only in regards to acceleration/deceleration, not top speed.

Thoughts and suggestion appreciated. I'd like to keep these, as their motor control is excellent.
Thanks, Otto K.


jeffstri

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Re: Setting top speed with Lenz decoders?
« Reply #1 on: June 01, 2018, 10:25:47 PM »
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There's no single CV that controls the maximum speed with the old Lenz decoders. You will have to set CV29 to use the speed table (CV67 - CV94) and change the speed table CVs. The easiest way to do it is with JMRI.

Cajonpassfan

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Re: Setting top speed with Lenz decoders?
« Reply #2 on: June 02, 2018, 07:22:05 PM »
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Thank you, that's what I was afraid of... (Don't have JMRI and doing it manually is a pain).
Appreciate the response.
Otto K.