Re: Blinking red LED; C&K MD's

[Jim <alarminex@xxxxxxx>]

On Dec 4, 4:03=A0pm, cha...@xxxxxxxxx wrote:
> Taking over old system containing C&K =A0DT435 and DT460S motion
> detectors. =A0Installed NX8E and connected the MD's.
>
> PROBLEM: =A0Red LED's on all of the MD's blink continuously every second
> or so. =A0Why? Pulsing continues long after power-up. Have powered
> down/up several times.
>
> Yellow and green LED's cycle on and off as their respective
> technologies are tripped, indicating to me that neither pir nor
> microwave have gone to sleep. Red LED's light after yellow and green
> LED's light, causing normal relay transfer. =A0All appears to be normal
> except that after the MD's reset, the red LED continues to flash every
> second or so, and never stop. System keypad green ready light
> extinguishes when there is movement, and lights when the MD's reset.
> indicating MD relays are functioning properly.
>
> I have read the 435 manual (do not have a 460S manual), but I did not
> see an explanation for the pulsing red LED. =A0Red LED's continue
> pulsing long after power-up.
>
> Brought two 640S to shop workbench. =A0Applied 12 volt battery, without
> charger. No pulsing red LED, even during power-up. =A0All LED's operate
> properly. Units perform perfectly.
>
> Anyone have an answer?

Ummmm In the DTS 420/435/450 installation instructions, mentioned on
pages 2,8 and 10, it says that a flashing Red LED is a micro wave
failure indicator. It even mentions that the flashing red LED will
override the disabling jumper for the red alarm LED.

The installation instructions are just a small 18 page booklet.