Hi Hugh again Just to clarify the set up: The SSR controls the AC power from the inverter to the heating load. It switches partway through each half cycle and thus controls the power to the load. The input to the SSR requires a power supply 8-32 V present all the time it is working. I suppose it might be feasible to take this from the AUX but as this will be pulsing PWM I don't want to rely on that. Its a supply voltage to the input and not a control signal and for that reason I want to take it from the main battery which happens to be a 24 volt one which is ideal. The control signal is 0-10 volts DC and this controls the amount of power the unit delivers smoothly. I want to get this from a capacitor that charges off the aux output so that is turns the PWM into an analog voltage signal that controls the SSR and controls the load. I do this all the time with tristar outputs so it does work. I have just never done it with the AUX of a FM80 controller.
So my question again is simply this. Can I connect the ground of the AUX to the inverter batter ground negative? Most likely it is already connected, but I'd like to know if connecting it will damage the FM80. I am also trying the outback forum. thanks for any help Hugh On 5 Dec 2014, at 18:44, Hugh Piggott wrote: > hi wrenches, > > I am installing some load controls for a client who has a FM80 controller. I > don't have experience with this product. It has a 12V aux output that I wish > to drive an SSR but the wiring is complicated by the fact that this SSR also > needs a power supply as well as a control signal. I want to use 24V nominal > system battery for the SSR power and AUX for the signal. Can I connect the > grounds together? > > Additional info. I am using a phase control SSR driven by a 0-10 volt signal > to control an AC load with phase angle shift control. I plan to put an RC > filter that converts the PWM output of the AUX from the CC to give an analog > voltage output that determines the loading of the inverter. Crydom MCPC2450 > > thanks for any help before I go on site next week > Hugh > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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