Transformer 6647 - actual voltage output

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Transformer 6647 - actual voltage output

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Danlake		#1 Posted : 09 February 2013 09:29:44(UTC) Retweet
Joined: 03/08/2011(UTC) Posts: 1,571		Short question regarding Marklin transformer 6647. Supposed to be 4-16V and yellow output of 16V. I got 230V in house and both of my brand new transformers are consistently giving 19.5V? As I will soon install more Viessmann signals (they are being powered from these transformers) I am just getting slightly concerned if the higher voltage can damage the LED in the long run? And what about other lights that normally goes with standard 14-16V used in model rail roading? Thanks in advance! Brgds - Lasse
		Digital 11m2 layout / C (M&K) tracks / Era IV / CS3 60226 / Train Controller Gold 9 with 4D sound. Mainly Danish and German Locomotives.


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Markus Schild		#2 Posted : 09 February 2013 11:03:23(UTC) Retweet
Joined: 14/01/2006(UTC) Posts: 1,802 Location: Wurttemberg		Hi Lasse, Measuring transformers without load always returns wrong results. Just connect a small bulb to the transformer and repeat the measuring. You will get something between 16 and 17 VAC. Regards Markus
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Danlake		#3 Posted : 09 February 2013 11:31:31(UTC) Retweet
Joined: 03/08/2011(UTC) Posts: 1,571		Thanks Markus, I learned something new today! Brgds - Lasse
		Digital 11m2 layout / C (M&K) tracks / Era IV / CS3 60226 / Train Controller Gold 9 with 4D sound. Mainly Danish and German Locomotives.


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H0		#4 Posted : 09 February 2013 12:44:08(UTC) Retweet
Joined: 16/02/2004(UTC) Posts: 15,440 Location: DE-NW		16 V is the output voltage you should get with 230 V input voltage and 32 VA load. Less load, more output voltage. As Markus wrote, measuring without load gives a useless result.
		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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cookee_nz		#5 Posted : 14 February 2013 10:03:26(UTC) Retweet
Joined: 31/12/2010(UTC) Posts: 3,992 Location: Paremata, Wellington		Originally Posted by: H0 16 V is the output voltage you should get with 230 V input voltage and 32 VA load. Less load, more output voltage. As Markus wrote, measuring without load gives a useless result. Also, what is the rated input of the Trafo on the label, is it 230VAC or 220VAC? Even though NZ is a 240v supply country, there are LOTS of 220v trafo's to be found here, in fact 240v ones are more rare. Did you find the output more in line with what you expect with a load on? Interesting. Steve
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H0		#6 Posted : 14 February 2013 11:12:49(UTC) Retweet
Joined: 16/02/2004(UTC) Posts: 15,440 Location: DE-NW		For about a decade now, Europe has a unified "compromise" voltage of 230 V and all recent M* products (including 6647 and 66470) are for 230 V. IIRC my 6647 gives slightly more than 18 V without load.
		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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Danlake		#7 Posted : 14 February 2013 14:24:09(UTC) Retweet
Joined: 03/08/2011(UTC) Posts: 1,571		Originally Posted by: cookee_nz Originally Posted by: H0 16 V is the output voltage you should get with 230 V input voltage and 32 VA load. Less load, more output voltage. As Markus wrote, measuring without load gives a useless result. Also, what is the rated input of the Trafo on the label, is it 230VAC or 220VAC? Even though NZ is a 240v supply country, there are LOTS of 220v trafo's to be found here, in fact 240v ones are more rare. Steve Hi Steve, Are we not on 230V in NZ http://www.trustpower.co.nz/index.php?section=79 My transformer is labelled 230VAC and bought from Germany. I will check with load on once I get back home from work - in 3 weeks time... Brgds - Lasse
		Digital 11m2 layout / C (M&K) tracks / Era IV / CS3 60226 / Train Controller Gold 9 with 4D sound. Mainly Danish and German Locomotives.

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cookee_nz		#8 Posted : 14 February 2013 20:43:19(UTC) Retweet
Joined: 31/12/2010(UTC) Posts: 3,992 Location: Paremata, Wellington		Originally Posted by: Danlake Originally Posted by: cookee_nz Originally Posted by: H0 16 V is the output voltage you should get with 230 V input voltage and 32 VA load. Less load, more output voltage. As Markus wrote, measuring without load gives a useless result. Also, what is the rated input of the Trafo on the label, is it 230VAC or 220VAC? Even though NZ is a 240v supply country, there are LOTS of 220v trafo's to be found here, in fact 240v ones are more rare. Steve Hi Steve, Are we not on 230V in NZ http://www.trustpower.co.nz/index.php?section=79 My transformer is labelled 230VAC and bought from Germany. I will check with load on once I get back home from work - in 3 weeks time... Brgds - Lasse Just checking you were all paying attention It's true, a little knowledge can be dangerous, (mental note to self, double check what you write....). Yep, you're quite right, 230v is the 'official' rated supply, with a tolerance of +/- 6% which gives you anywhere from around 215v right up to 243v. Usually my checks have been on the high side, just checked now (with a Fluke meter), 238.6v (with load). I also happen to be doing my current loco testing with a 240v Trafo so I just seem to have 240v 'stuck' in my brain. My 240v is therefore retracted, and in the words of a certain MP using silly language recently, I apologise unreservedly 230 230 230 230 Let's see if that sticks Otherwise, looks like I'm back to electric-school 101. Thanks
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