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<div class="moz-cite-prefix">I don't believe the aux is PWM. It
should be a straight 12 v 200 mA output as I recall. Its just
enough to run a battery fan, or a 12 v relay. You shouldn't need
anything else. Being current limited, it doesn't even need a
fuse.<br>
Also you need to run both leads (pos and neg) from the aux output
to the control side of the relay. It is its own output and you
will probably cause unfortunate things to happen if wired in
common with anything else. I usually use signal wire with
multiple conductors, so trying to get away from one control
conductor is fool hardy anyway.<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
On 12/5/2014 3:09 PM, Hugh Piggott wrote:<br>
</div>
<blockquote
cite="mid:D683A8E4-679C-43B2-98B6-CD7E3CA90467@scoraigwind.co.uk"
type="cite">Hi Hugh again
<div>Just to clarify the set up:</div>
<div>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.</div>
<div>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.</div>
<div>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.</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>thanks for any help</div>
<div>Hugh</div>
<div><br>
<div>
<div>On 5 Dec 2014, at 18:44, Hugh Piggott wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div style="word-wrap: break-word; -webkit-nbsp-mode: space;
-webkit-line-break: after-white-space; "><span
class="corners-top"><span></span></span>
<div class="postbody">
<h3 class="first"><span class="Apple-style-span"
style="font-weight: normal; font-size: medium; ">hi
wrenches,</span></h3>
<div class="content">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?<br>
<br>
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<br>
<br>
thanks for any help before I go on site next week<br>
Hugh</div>
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