brucecampbell Posted May 15, 2018 Share Posted May 15, 2018 I've been using the HC300's relay to run a 12v relay switching a waterfall. The waterfall stopped working, yet C4 still showed as on and off. I tested the voltage at the relay running the waterfall pump and I'm only getting around 2 volts. Any thoughts on what has gone wrong with the Hc300? Link to comment Share on other sites More sharing options...
dinom Posted May 15, 2018 Share Posted May 15, 2018 The relay doesn't provide voltage by itself, it is just acting as a switch. What is the source of the 12V power? Is it a separate power supply (i.e. wall wart)? Or is it the 12V port of the HC300 Contact connector? Link to comment Share on other sites More sharing options...
brucecampbell Posted May 15, 2018 Author Share Posted May 15, 2018 I'm using the 12 V from the HC300 contact as the source of power. The HC300's relay is the switching. it runs a 240v relay which runs the waterfall pump. All has been working well for 2 years. It stopped working recently and putting a volt meter on the circuit shows only 2-3 V coming from the controller. Link to comment Share on other sites More sharing options...
Cyknight Posted May 15, 2018 Share Posted May 15, 2018 I'd say you know the answer, the contact is burned out. Easy fix is to get a separate 12v powersupply and use it instead. Link to comment Share on other sites More sharing options...
brucecampbell Posted May 15, 2018 Author Share Posted May 15, 2018 I think I need to do some more testing - I just realised I am also using the contact for a garage door sensor - which is working fine. Would this mean the 12v is likely still working? or does a contact still work with only 2-3 V flowing? When you say the contact is burned out - what does this mean exactly? Thanks Link to comment Share on other sites More sharing options...
thegreatheed Posted May 18, 2018 Share Posted May 18, 2018 Yes, a contact would still sense only 2-3V. When you tested, did you test between 12V and GRD directly on the back of the HC-300? Or did you test somewhere else? Link to comment Share on other sites More sharing options...
brucecampbell Posted May 18, 2018 Author Share Posted May 18, 2018 29 minutes ago, thegreatheed said: Yes, a contact would still sense only 2-3V. When you tested, did you test between 12V and GRD directly on the back of the HC-300? Or did you test somewhere else? So far I have only tested the voltage at the independent relay out in the pool's pump shed. I have not yet had time to test at the controller, but I did notice my driveway sensor which also uses the 12V contact to power the unit is no longer working - pretty sure that is using the HC300's 12v power supply too. Link to comment Share on other sites More sharing options...
brucecampbell Posted June 26, 2018 Author Share Posted June 26, 2018 Finally getting around to sorting out my driveway sensor... I need some advice to ensure I get this connected up right. I was powering the sensor using the 12V and GND - I will remove these wires and power the device using an independent 12V supply. I am sensing using 12V and SIG. >> If the controller no longer outputs enough voltage to be sensed, how do I wire this up? Link to comment Share on other sites More sharing options...
zaphod Posted June 27, 2018 Share Posted June 27, 2018 I would be wary of the power supply on that HC-300. I have had a few PS'es go bad on those units, but maybe you have different/better ones in NZ than we have in NA. Link to comment Share on other sites More sharing options...
brucecampbell Posted June 27, 2018 Author Share Posted June 27, 2018 So far the only problem I have is with the 12V contact output. Would this issue be directly related to the HC's power supply? - Is it easy to replace the power supply - from memory these are internal right? Link to comment Share on other sites More sharing options...
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