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Re: [TowerTalk] HDX-555 relay settings

To: <>
Subject: Re: [TowerTalk] HDX-555 relay settings
From: "Doug Rehman" <>
Date: Mon, 30 Aug 2010 16:02:29 -0400
List-post: <">>
My Tri-Ex LM354-HDSP has a delay circuit for the up side and one for the
downside. As the time is set by a fixed resistor, I'm not sure what the
intended delay is, but I'd estimate it to be around two seconds. (Both
delays are identical.)

My understanding of the delay is that it serves two purposes:

1) To eliminate the possibility of the motor continuing in the original
direction if the direction is attempted to be immediately reversed

2) To allow the tower to gently stop before the direction is reversed

Although yours is from a different manufacturer, the same theory should

(Running for ARRL Southeastern Division Director- please check out my
website at 

> -----Original Message-----
> From: [mailto:towertalk-
>] On Behalf Of Ed Magnuson
> Sent: Monday, August 30, 2010 2:39 PM
> To:
> Subject: [TowerTalk] HDX-555 relay settings
> I am new to this group and hope this is an appropriate question. I
> an HDX-555 from a ham's  widow and have had a problem with the time delay
> relays that control the motor drive. I wish to replace the two plug-in
> relays in the control box and have substitutes on hand but am not certain
> what the settings should be. The range is .1 to 10 seconds. Does anyone
> what settings I should select and if so, should they be the same in both
> relays or different from the left to the right one as I face the box?
> The relays are the Dayton 8-pin 5X828f solid state.  A small knob on each
> sets the timing.
> I am asking here since US Towers is unresponsive.
> Ed, W1MAG


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