Pure Sine Wave MRC Power Pack Question regarding voltage drop

First things first, specifically WHAT make/model of transformer are we talking about?

If this a MRC Pure Power transformer, the diodes drops do cause conventional stuff to slow down typically.

Hi John,

It's an MRC Pure Power AC transformer, model AH501. 

Does that help?

Thanks,

Drew

@Drewski1992 posted:

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I remember reading in the manual on this type of transformer that it said that it is normal for the voltage to drop when the horn or bell buttons are pressed.  The manual said this is normal and is not considered to be a defect in the product.

However, I notice that when I have speed control turned on that the locomotive does not slow down significantly if at all when these buttons are pressed.

It depends on the definition of "this type of transformer".  Engine slow-down upon pressing W or B in conventional mode is a widely reported behavior - so, yes, to your point others have noticed this.  For example, see this OGR thread.  Here's another thread which digs a bit deeper into the nuts-and-volts but it does get somewhat tedious.  That is, there are other "types" of transformers where it is "normal" for the voltage (and engine speed) to increase when the W or B button is pressed.

Separately, regarding the MTH PS speed control.  This may be too-much-information but what the PS engine electronics does with speed-control ON is to ignore changes in the track voltage when W or B is pressed.  In effect, the engine "remembers" the speed it was going before W or B... and attempts to keep that speed until W or B is released.

And thank you for posting the videos which clearly demonstrate the issue.

Thanks for your help Stan! I have to admit though it’s pretty annoying when you’re wanting to press your horn or bell buttons and you get a drop in voltage like that in conventional mode! Do Williams engines respond the same way to the AH501 MRC pure sine wave power pack?

Thanks,

Drew

Also does anyone know how Williams engines respond to the MTH Z750?