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I am trying to decrease the max speed on a loco with a? QSI, ver. 6. As discussed in the Comprehensive Programmer, I have set the Vstart to Zero and the Max Volts to One. On the Speed Table page "Use QSI Table or User table in CVs 67 through 94" is selected. The Quantum Speed Table is set to "User Defined Speed Table." Forward and Reverse Trim are both set to "128." No mater how low I drop the curve the locos maximum speed does NOT decrease.
What am I doing wrong? Thanks, Michael Boyle |
开云体育Michael, IN JMRI the two items you mention are are covered over two panes.
The first has V start and V max with the option above to use these
instead of the speed table - select this option. V start is
normally set at about 32 this gives a reasonable start. Use V max
for the top speed. Do not use the speed table option until you are totally OK with these settings. Gerry
On 2/12/2019 12:58 pm, Michael Boyle
wrote:
I am trying to decrease the max speed on a loco with a? QSI, ver. 6. As discussed in the Comprehensive Programmer, I have set the Vstart to Zero and the Max Volts to One. On the Speed Table page "Use QSI Table or User table in CVs 67 through 94" is selected. The Quantum Speed Table is set to "User Defined Speed Table." Forward and Reverse Trim are both set to "128." No mater how low I drop the curve the locos maximum speed does NOT decrease. -- Gerry Hopkins MMR #177 FNMRA Great Northern Downunder NMRA Australasian Region Contest & AP Chairman Web Administrator |
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Michael,
On 2 Dec 2019, at 12:58 PM, Michael Boyle <boyle10017@...> wrote:I think you'll find your QSI-specific answer here: <> Dave in Australia |
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Marc,
Yes, I "Write Changes..." each time. Dave, I set Vstart to Zero. I could not set Vhigh to Zero so I set it to One. If I'm interpreting the "Gotchas" comment this should have minimized the effect on the Speed Table. But even with the Step 1 of the Speed Table at 1 and Step 28 at 10 (a low, linear line) the loco goes like a wild stallion. Any thoughts? Thanks, Michael PS: Always looking for your latest post. - MB |
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Nick
Mike, I've looked at most of the responses and, as a BETA Tester for QSI, I noticed you mentioned the decoder was a Version 6, which relates to the ORIGINAL QSI decoders, NOT one that has been upgraded, am I correct ? In THAT instance, you have a problem. That particular version had the BASIC features of a normal decoder but NOT the advanced features like BEMF and speed tables . This is thanks to Mike's Train House and their frivolous law suit (that he LOST) stating he "invented" the DCC features . QSI and other sound decoder manufacturers had to cripple those features until the suit was settled, which took YEARS . Thanks MTH. If you really want to have those features, you MUST upgrade to the Version 7 chip, (available from QSI or Litchfield Station . (I am sure there are others but I do not know all of them.)? When I BETA tested the QSI programmer and the upgrade chips, those features were added as part of the upgrade. The upgrade chips run about $30.00 - $35.00 , are easy to install, and can be ordered with the type of loco you purchased or reprogrammed with any file you want using the QSI programmer and software from QSI. Trying to make the old chips work is like shoveling sand from the bottom of a hole. The original chip is unstable and a short circuit will usually reset them back to default CVs, which means that you will need to attempt to re-program them almost every time a short happens on the layout.? There are some that say it is possible but after doing this for almost 18 years, I can provide documentation about it if necessary . In any case, my strong suggestion is to purchase an upgrade chip , toss the old one into the circular file, and have a much better decoder for less than most silent decoders. Contact me off-list if you want the info. Respectfully, Nick Kulp "I'm not a failure. I started at the bottom and I found it easily attainable. Life is too short to set unattainable goals" - Nick Kulp
On Sunday, December 1, 2019, 09:06:37 PM EST, Michael Boyle <boyle10017@...> wrote:
I am trying to decrease the max speed on a loco with a? QSI, ver. 6. As discussed in the Comprehensive Programmer, I have set the Vstart to Zero and the Max Volts to One. On the Speed Table page "Use QSI Table or User table in CVs 67 through 94" is selected. The Quantum Speed Table is set to "User Defined Speed Table." Forward and Reverse Trim are both set to "128." No mater how low I drop the curve the locos maximum speed does NOT decrease. What am I doing wrong? Thanks, Michael Boyle |
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Michael and Nick,
On 2 Dec 2019, at 4:22 PM, Nick via Groups.Io <cornwall9@...> wrote:My comments in that JMRI support page were based on V7 QSI decoders (QSI documentation and owning a number). That probably explains the "folklore" I've heard about QSI decoders. The only problems I've encountered have been accidental resets due to motor magnetic fields from a passing loco and the almost-universal fail-closed reed switch (solved with sidecutters). Dave in Australia |
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Nick
Dave, Allow me to expand your knowledge a little more with "non-foklore" based on experience.? Picture this, You are in the middle of an op session with 15 friends. You are using a Digitrax system and have several OEM QSI version 6 decoder-equipped locos. As will happen, some operator runs an open switch, causes a short, and the session comes to a halt (Pre-PM42 days) . The offender "pulls" back the loco from the short area, The Digitrax system "reboots". (which feeds a heavy spike of PURE DC current onto the track because Digitrax older systems have a HUGE resonance frequency imbalance until they settle down.? Suddenly, ALL of the Version 6 locos take off at MACH 5 because the default settings include restoring the analog "conversion" to activate. Locos with strings of 20 hoppers with LIVE loads of coal, stones or ore literally FLY toward curves or through coal loading facilities or toward the sharpest curves not designed for high speed trains. (do NOT ask how I know this) . Cleanup will take DAYS as now there is coal, stones, and red ore everywhere that has been dumped by those trains. You also find locos in the turntable pit or smashed through the rear walls of the roundhouse because, it IS only plastic or wood. Some have even attempted to leap across the gap where you are using a gate or bridge to access the layout while someone needed to open it during this debacle. NOW you are talking about an exciting session where mere mortals have attempted to literally catch trains hell bent on self destruction. You BETCHA that I upgraded EVERY one of those suckers ASAP. Side note, Digitrax will sternly deny this problem as? they fixed it in later Boosters like the Zephyr but refused to upgrade older systems for FREE like their competitors . Have a good one, Nick Kulp "I'm not a failure. I started at the bottom and I found it easily attainable. Life is too short to set unattainable goals" - Nick Kulp Michael and Nick, My comments in that JMRI support page were based on V7 QSI decoders (QSI documentation and owning a number). > > Trying to make the old chips work is like shoveling sand from the bottom of a hole. The original chip is unstable and a short circuit will usually reset them back to default CVs, which means that you will need to attempt to re-program them almost every time a short happens on the layout. That probably explains the "folklore" I've heard about QSI decoders. The only problems I've encountered have been accidental resets due to motor magnetic fields from a passing loco and the almost-universal fail-closed reed switch (solved with sidecutters). Dave in Australia |
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Strangly ALL the QSI Ver 6 definitions in DecoderPro contain? Speed Table option. Even the older pre-V6 definitions contain Speed Table.
As per QSI manual : http://qsindustries.com/manuals/full%20dcc%20manual.pdf If CV5 = 0, 1 or 255 the value used for any calculation is 255.? This also affect all? Speed Table and User Defined Speed Table. So if you want to lower top speed, set CV5 =2 thru 255 " CV 5 sets a maximum voltage for the motor to any value between 2 and 255. A value of 0, 1, or 255 provides maximum motor voltage at maximum throttle. " So setting CV5 =217 would apply 85% of full available power.? A value of 128 in CV5 would be 50% power. Marc |
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Nick
Marc, I've worked with them since they have been around. Trust me, the instability makes setting them up, just not worth the effort if they do not get upgraded. One short circuit and they revert to defaults and only last as long as the next short. Nick Kulp "I'm not a failure. I started at the bottom and I found it easily attainable. Life is too short to set unattainable goals" - Nick Kulp
On Monday, December 2, 2019, 01:03:12 PM EST, <forfoum@...> wrote:
Strangly ALL the QSI Ver 6 definitions in DecoderPro contain? Speed Table option. Even the older pre-V6 definitions contain Speed Table. As per QSI manual : http://qsindustries.com/manuals/full%20dcc%20manual.pdf If CV5 = 0, 1 or 255 the value used for any calculation is 255.? This also affect all? Speed Table and User Defined Speed Table. So if you want to lower top speed, set CV5 =2 thru 255 " CV 5 sets a maximum voltage for the motor to any value between 2 and 255. A value of 0, 1, or 255 provides maximum motor voltage at maximum throttle. " So setting CV5 =217 would apply 85% of full available power.? A value of 128 in CV5 would be 50% power. Marc |
Michael Boyle