Reply To: Power supply recommendation for older M1s

[Paul]

I am also having trouble posting links into this forum, my two last posts with further details never posted.

One was about that firmware update, but its an old 2009 release before the new energy standards came into effect and subsequently there was a mention from David that he was adding changes to at least the Ness firmware to take support it up to 20V (I assume he meant DC).  I have been unable to get a hold of any M1 firmware notes from Ness so cannot verify if this voltage support ever got released.  Also not seeing any Rev M markings above zone 1.

Great we agree 16VDC will not cut it.  I’ve been discussing with another installer we both believe the advise from the local support technicians to use 24VDC is likely very bad advise, and from past experience we have found the local distributor not to be willing to replace hardware when their recommendations cause damage so unless we can find firmware release notes or some proof of 24VDC being supported by the M1 its probably too risky to try their advise.

I might hunt around a bit more to see a an AC power pack can be sourced via some off market channel or order a custom built transformer, failing that will try a 18VDC 3amp pack but it would be great if we could come to a definitive answer.

Next worry is with M1G’s tend to fail at the worst time if something is wrong such as inadequate power. We may hookup a new supply and find they work ok for weeks until an alarm event occurs, high power event or minor power brownout then their internal circuitry forces an immediate restart essentially meaning they are unstable and very difficult to identify what causes it.  Another reason I’m trying to avoid determining the DC power supply sizing by trial and error.