mSD3 and SDS motor with capacitor "doubtful"

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mSD3 and SDS motor with capacitor "doubtful"

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jonas_sthlm		#1 Posted : 26 November 2025 11:52:30(UTC) Retweet
Joined: 12/10/2008(UTC) Posts: 1,044 Location: Stockholm, Södermalm		Does anyone know if it would be harmful for an SDS motor if you connect it to some type of power backup easy capacitor on +Ub/GND? I install them on others without any problems so... This installation has a buffer capacitor installed. BLDC Motor Controller für bürstenlose Motoren (C-Sinus, SDS und Maxon EC) Edited by user 29 November 2025 09:26:01(UTC) \| Reason: Not specified
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jonas_sthlm		#2 Posted : 27 November 2025 17:02:31(UTC) Retweet
Joined: 12/10/2008(UTC) Posts: 1,044 Location: Stockholm, Södermalm		I gave it a try with 1000uF 25V capacitor, but it doesn’t seem like the LED stays on for longer The sound module was connected here for39894Br189/441 with its original LokPilot V3.0 M4 decoder. I tried with a 2200uF 25V and connected an LED directly on capacitor, and it lights up when the power is cut but not the locomotive. So, the conclusion is that the capacitor doesn’t function with the standard SDS configuration when the GND (-) is connected directly to the engine It turned into a slightly simpler solution by using a direct cable Edited by user 29 November 2025 09:32:10(UTC) \| Reason: Not specified
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kiwiAlan		#3 Posted : 28 November 2025 14:03:08(UTC) Retweet
Joined: 23/07/2014(UTC) Posts: 8,600 Location: ENGLAND, Didcot		Originally Posted by: jonas_sthlm So, the conclusion is that the capacitor doesn’t function with the standard SDS configuration when the GND (-) is connected directly to the engine If you are connecting it directly to the chassis of the loco, no that will not work.

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jonas_sthlm		#4 Posted : 28 November 2025 14:49:12(UTC) Retweet
Joined: 12/10/2008(UTC) Posts: 1,044 Location: Stockholm, Södermalm		I don't follow you, doesn't ground with chassi... Follow the connection line as it goes into the connection for the SDS engine. This link has an interesting article, so fischer-modell.de can maybe be the solution...
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jonas_sthlm		#5 Posted : 28 November 2025 23:54:07(UTC) Retweet
Joined: 12/10/2008(UTC) Posts: 1,044 Location: Stockholm, Södermalm		It seems to work better with T44... It works with the LED staying on longer when standing still, but the movement stops immediately if it loses power I feel like there are just too many components on the circuit board for a capacitor to keep it running and AUX4, even with 2200uF. I’ll probably remove the capacitor if it doesn’t seem to provide more than LED functionality after some test driving. Edited by user 29 November 2025 10:03:01(UTC) \| Reason: Not specified
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