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9 replies

DZ-2502 LED indicator behavior

Len BLen BOGR Forum Member

Today I installed 4 DZ-2502 remote pushbuttons (for the DZ-2500 model switch motor) and connected them to switches. The pushbuttons are wired red to accessory power buss wire, 14VAC (same buss powers the switch motors), black to common and white to the switch. When the switch indicator is green, the button shows green as well, but the red indicator on the button is also lit, albeit very dim. When the switch indicator is red, the button behaves normally and only shows red. There are no other problems and the button operates the switch just fine.

 

The first picture shows the strange indication when the switch indicator is green. The switch is red in the second picture and the pushbutton indication is normal.

 

I checked the wiring and do not see a problem. Any ideas?

Green

Red

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Last edited by Len B
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Steve HorvathSteve HorvathOGR Forum Member DIGITAL SUBSCRIBER

Len

Have you tried disconnecting the wiring from all but one of the 2502? Try shooting the problem on just one machine to find what seems to affect all the controllers. Once you find the problem if it still exists on one switch motor the rest will most likely work ok. You just want to prove there is no interference from one that might affect all. Did you have the Z1000 switch motors working on these switches before?

 

Steve H

zstuff finish 008

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  • zstuff finish 008: Some z1000/2500 switch motor & controllers
Len BLen BOGR Forum Member

Hi guys, thanks for the pointers. I ran a few tests this morning and concluded it is definitely some sort of interference or current problem, possibly a ground loop condition.

The devices themselves (2502 pushbuttons connected to 2500 switch motors) are not the problem. It is just odd the problem only affects one bank of buttons on a circuit that carries several more, so it is a local problem of some type. Fortunately, the buttons still operate the switches which means I can take my time troubleshooting.

Len BLen BOGR Forum Member

I completed some additional tests and wanted to provide one more update before I call it a day. I also sent an email to Z-Stuff asking for some guidance.

 

Completely isolating a switch motor and pushbutton from the layout wiring did not resolve the issue. Running the same test again with a different switch motor and pushbutton had no effect. Changing the transformer and even the wall outlet circuit also made no difference. I tried various other combinations involving wiring, voltage levels and power supply combinations and the problem remained ever present. I even changed the proximity of the pushbuttons and wiring connections to the transformer location to see if that made a difference. None of these changes had any effect on the behavior of the errant red LED.
 
Much to my surprise, closer inspection of the two pushbuttons I already had on the layout that I thought didn’t have this problem revealed a slight issue as well - it just isn’t as pronounced and so I never noticed it.
 
What I concluded is that when the pushbutton is in a green aspect, there appears to be bleed-over to the red LED that increases in intensity as the voltage increases. I’m just not sure if it is reflected light from the green LED or there is really current on the red LED when there should not be.
 
I am sure there are thousands of 2502s in service around the hobby. I will be curious to learn if others have run across this issue or it is unique to something in my environment. Maybe I will ask around at York if I end up going.
 
Cheers

 

Last edited by Len B
Len BLen BOGR Forum Member

Cjack,

 

Thanks for the thought. I am not familiar enough with the circuit to say one way or the other. By isolating the components and trying different transformers in those isolated tests I've concluded this behavior is not related to my layout, which I suppose is somewhat good news in that I am not dealing with a wiring issue. I'll see what the Z-Stuff folks have to say and take it from there.

Len BLen BOGR Forum Member

Okay, one last update to tell you how my situation worked out...or didn't.

 

Apparently, a dimly lit red LED when the indication is green is normal behavior for this push button / switch motor combination; this is straight from the horse's mouth. I find it rather odd and indicative of a design flaw, but I guess it is what it is. I won't lose any more sleep over this item.

 

Thanks again to those of you who responded.

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