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Offline Ivan  
#1 Posted : 08 March 2020 09:51:23(UTC)

Joined: 08/08/2018(UTC)
Posts: 77
Location: Potsdam
Several Märklin users confirmed that electronic reverse units cause motors to run slower than expected.In my case it is 3318, depicted with Siemens Märklin reverse unit (often wrongly assumed to be a decoder).
One of Marklin users measured the electricity that flows into the motor, then replaced reverse unit with conventional (mechanical) reverse unit,and the loco run faster being supplied with more electricity (measured again).
It is obvious that electronic reverse units consume more power than conventional (mechanical) units.The cause of this phenomenon remains unclear, though.
Is it normal for at least some of electronic units to behave like this or capacitors lost capacity after decades of storage ? Or something else ?

I will run my 3318 with electronic unit because I am not an expert to change it.Besides,everything works fine (lights and direction change is flawless) except for slower speed compared with other locos at the same setting on white transformer.
And: Do not fix what is not broken.
Thanks for sharing your experience.

Offline JohnjeanB  
#2 Posted : 08 March 2020 11:40:21(UTC)

Joined: 04/02/2011(UTC)
Posts: 940
Location: Paris, France
Hi Ivan

I belive Märklin used multiple types of these electronic reverse units
- combined with electromechanical relay (e.g.: my 3309 Telex loco) around 1980
- purely electronic (I don't have any of those)
The idea was:
1- to avoid the jerk movement when an inversion pulse was sent
2- to stop the flash effect on bulbs at the same time
3- to provide a somewhat constant illumination of direction lights no matter what the selected speed was.

So it is possible in your case that some electronic components (transistors, etc) in series with the motor have a slowdown effect to correct the jerk movement.

This is the little I know about this sorry.
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Offline GaryTrooper  
#3 Posted : 26 March 2020 12:11:25(UTC)

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Joined: 26/01/2018(UTC)
Posts: 250
Location: Hailey, Idaho
I can confirm slower locomotive speeds with a Delta decoder set in analog mode compared to an electromechanical reversing unit. I have jumpered out a couple of Delta decoders and ran the locomotives, in one direction only, from a direct connection to the pickup shoe, with no decoder or electromechanical reversing unit in the motor circuit. The locomotives clearly run slower with the decoder in the motor circuit. I actually like the slower motor speeds and I haven't observed a reduction in power on steep inclines.
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Offline RayF  
#4 Posted : 26 March 2020 12:55:56(UTC)

Joined: 14/03/2005(UTC)
Posts: 15,694
Location: Gibraltar, Europe
I have never had the urge to run my locomotives at breakneck speed anyway, so I guess I welcome the fact that the speed is reduced when a decoder or other electronics is present.

As far as Delta is concerned, I find that in many delta locos the minimum speed at which the loco actually moves smoothly is way too high, so I have been methodically upgrading my Delta locos with modern decoders as time and money permits.
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Offline Purellum  
#5 Posted : 26 March 2020 12:57:56(UTC)

Joined: 08/11/2005(UTC)
Posts: 3,216
Location: Mullerup, 4200 Slagelse

Originally Posted by: Ivan Go to Quoted Post
Is it normal for at least some of electronic units to behave like this

Yes BigGrin

In a electromechanical relay the current is only passing a relay contact on it's route from tracks to the motor
and back to the tracks; the voltage is not being reduced in the relay contact.

In a electronic reverse unit the current is passing through diodes and transistors,
each of which reduces the voltage with approximately 0,7 Volts.

I expect the current to pass 2 diodes and 2 transistors on its way = 4 x 0,7V = 2,8V voltage reduction.



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