[RE-wrenches] common ground on fm80 aux output?

Fri Dec 5 17:43:39 PST 2014

Hi Roy,

The fm-80 has two different diversion options. 

Diversion:relay
 And
Diversion: solid state. ( which is PWM)

Jay
Peltz power

> On Dec 5, 2014, at 5:34 PM, "Windsine Inc." <windsine at gmail.com> wrote:
> 
> oh ok, now figured out what your doing. The aux output on the FM80 is not PWM. Im pretty sure the classic can do PWM out of the aux port however. I know this is for an AC load, but is your primary goal to protect the batteries from over charge? Or to control rotor RPM?
> 
> RoyR
> 
>> On Fri, Dec 5, 2014 at 7:28 PM, Windsine Inc. <windsine at gmail.com> wrote:
>> I agree with Jay, a meter should tell you. If I were you, I would just go for isolation anyway, and add a secondary relay (electro-mechanical -a small one) driven by the FM80 aux. This would make sure you have the isolation you need n
>> 

>> RoyR
>> 
>>> On Fri, Dec 5, 2014 at 6:09 PM, jay peltz <jay at asis.com> wrote:
>>> Hi Hugh
>>> 
>>> I use 3-32vdc SS relays all the time powered from the AUX relay ( xantex, classic,outback). 
>>> They work just fine in fast and slow PWM 
>>> And switching both AC or DC, with correct relay of course. 
>>> 
>>> As to connecting the ground, that I can't tell you. But your ohm meter should tell you no?
>>> 
>>> Jay
>>> Peltz power
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>>> On Dec 5, 2014, at 2:09 PM, Hugh Piggott <hugh at scoraigwind.co.uk> wrote:
>>>> 
>>>> 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
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>> 
>> 
>> -- 
>> Roy Rakobitsch
>> NABCEP Certified Small Wind Installer®
>> NABCEP Certified Solar PV Installer®
>> NYSERDA eligible Small Wind installer
>> Certified Advanced Tower Climbing, Safety & Rescue
>> Wind/PV Design Engineer
>> Windsine LLC
>> 631-514-4166
>> www.windsine.org
>> 
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> 
> 
> 
> -- 
> Roy Rakobitsch
> NABCEP Certified Small Wind Installer®
> NABCEP Certified Solar PV Installer®
> NYSERDA eligible Small Wind installer
> Certified Advanced Tower Climbing, Safety & Rescue
> Wind/PV Design Engineer
> Windsine LLC
> 631-514-4166
> www.windsine.org
> 
> This communication is for use by the intended recipient and contains information that may be privileged, confidential or copyrighted under
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> constitute a contract offer, a contract amendment, or an acceptance of a contract offer. This e-mail does not constitute a consent to the use of sender's contact information for direct marketing purposes or for transfers of data to third parties.
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