Joined: 12/08/2006(UTC)
Posts: 9,289
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When i read my MS2 data,it shows 17,7 volts as power.
So i wonder if i can reduce power voltage,when to use DCC and 2 rail?
I didn´t try it yet,so standing an question first are more safety. |
H0
DCC = Digital Command Control
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Joined: 16/02/2004(UTC)
Posts: 15,463
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Hi! Originally Posted by: Goofy  When i read my MS2 data,it shows 17,7 volts as power. I think the MS2 is showing off. Track voltage probably is around 16 V and should be no problem for two-rail H0 items. You cannot get 17.7 V track voltage when using an 18 V switching-mode power supply. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS  |
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Joined: 12/08/2006(UTC)
Posts: 9,289
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Are you sure? It shows same every time i use MS2 and check.  |
H0
DCC = Digital Command Control
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Joined: 16/02/2004(UTC)
Posts: 15,463
Location: DE-NW
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Originally Posted by: Goofy Are you sure? I am sure. The question is where do they measure the voltage - and how. My 18 V Märklin power supply delivers 18 V +/- 0.1 V. Inside the track box there is a bridge rectifier (voltage drop of two diodes). At the track stage there are two transistors (voltage drop of two transistors). You simply cannot get 17.7 V track voltage from 18.1 input voltage with two diodes and two transistors in between. Track voltage must be lower than that. Use a True-RMS volt meter to measure the track voltage. Or try switching-mode power supplies with 16 V or 14 V to get a lower track voltage. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS |
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Joined: 12/08/2006(UTC)
Posts: 9,289
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I know you have MS2 too.
Can you show the picture,when check at the voltage in the MS2?
You must only use same power feeder as i do,it´s 66361. |
H0
DCC = Digital Command Control
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 Joined: 23/02/2005(UTC) Posts: 801
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Originally Posted by: Goofy When i read my MS2 data,it shows 17,7 volts as power.
So i wonder if i can reduce power voltage,when to use DCC and 2 rail?
I didn´t try it yet,so standing an question first are more safety. Hi, The NMRA standard states: "Digital Decoders intended for "N" and 70 smaller scales shall be designed to withstand a DC voltage of at least 24 volts as measured at the track. Digital Decoders intended for scales larger than "N" shall be designed to withstand a DC voltage of at least 27 volts as measured at the track". So, why a 18V voltage on the track is a problem? Furthermore, I agree with H0: if your MS2 is fed with 18V DC, it's impossible to get 17.7V on track. Fred
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 1 user liked this useful post by efel
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Joined: 12/08/2006(UTC)
Posts: 9,289
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Originally Posted by: efel Originally Posted by: Goofy When i read my MS2 data,it shows 17,7 volts as power.
So i wonder if i can reduce power voltage,when to use DCC and 2 rail?
I didn´t try it yet,so standing an question first are more safety. Hi, The NMRA standard states: "Digital Decoders intended for "N" and 70 smaller scales shall be designed to withstand a DC voltage of at least 24 volts as measured at the track. Digital Decoders intended for scales larger than "N" shall be designed to withstand a DC voltage of at least 27 volts as measured at the track". So, why a 18V voltage on the track is a problem? Furthermore, I agree with H0: if your MS2 is fed with 18V DC, it's impossible to get 17.7V on track. Fred The NMRA standards says soo...but real for the difference scales. N scale recommend maximum 14 volt on the track,cause of the wheels and smaller motor etc... Topic is about how to fix the problem by reduce voltage to 16 volt. It´s my goal. If you too have MS2 and 66361,please check data in the MS2 and show with an picture,if you get same result or not. |
H0
DCC = Digital Command Control
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 Joined: 08/11/2005(UTC) Posts: 3,528 Location: Mullerup, 4200 Slagelse
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 Hurray, a new voltage / rectifier / diode topic.  I'm looking forward to see the detonations. Per. |
If you can dream it, you can do it! I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide. In case this is not legally possible: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.  |
2 users liked this useful post by Purellum
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Joined: 16/02/2004(UTC)
Posts: 15,463
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Originally Posted by: Goofy If you too have MS2 and 66361,please check data in the MS2 and show with an picture,if you get same result or not. I know the voltage reading of the MS2 is nonsense by design. Screenshots won't make a difference. Would be interesting if someone with a high-frequency true RMS voltmeter or an oscilloscope would measure the actual track voltage when using a 66361. |
Regards Tom --- "In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS |
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Joined: 08/11/2005(UTC) Posts: 3,528 Location: Mullerup, 4200 Slagelse
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I just measured, using a Fluke 189 True RMS multimeter. Output from the 66361 was 18,090 V DC. Track voltage was 15,418 V AC. ( Only multimeter was connected ) MS2 showed 18,3 V. Per. |
If you can dream it, you can do it! I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide. In case this is not legally possible: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
3 users liked this useful post by Purellum
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Joined: 12/08/2006(UTC)
Posts: 9,289
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Originally Posted by: Purellum
MS2 showed 18,3 V.
Per.
Then in case...it´s bug in the MS2. |
H0
DCC = Digital Command Control
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Joined: 08/11/2005(UTC) Posts: 3,528 Location: Mullerup, 4200 Slagelse
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No, it's a feature, to tell you the approximate voltage from the 66361. Nobody have promised that you could measure the track voltage. Per. |
If you can dream it, you can do it! I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide. In case this is not legally possible: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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Joined: 12/08/2006(UTC)
Posts: 9,289
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No it´s not feature. It´s default in the MS2. |
H0
DCC = Digital Command Control
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Joined: 08/11/2005(UTC) Posts: 3,528 Location: Mullerup, 4200 Slagelse
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It's a feature, chosen by Märklin. If you want a controller with a feature that lets you measure track voltage, then you have chosen the wrong controller. That is your fault, not Märklin's. Per. |
If you can dream it, you can do it! I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide. In case this is not legally possible: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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