[RE-wrenches] Gen set problems

Tue Jun 15 08:01:16 PDT 2010

Transfer delay of 30 is too long with sensitive electronics.   This
means that when the AC input drops to 110VAC the inverter waits 30
cycles before we disconnect from the genset. 

If the Ac transfer control is set to Grid instead of GEN then you would
have to program these settings into the ADV/FX/GRID set points.   When I
visit sites I will usually program both GEN and GRID equal.    

Steve Higgins. 

Sr Application Engineering Mgr

Sub-Saharan Africa Business Dev Mgr. 

Outback Power Systems. 

19009 62nd Ave Ne 

Arlington Wa 98223

360-618-4313

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jeff
Wongstrom
Sent: Tuesday, June 15, 2010 6:37 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Gen set problems

Hello Steve,

In my case, I tightened the voltage window to 110 lower, 125 upper and
the transfer delay to 30.  This made no difference.  I did not confirm
SETUP/FX/INPUT ...ac transfer control set to GEN.

On Jun 15, 2010, at 7:15 AM, Steve Higgins wrote:

William, 

Check to make sure what Input you have selected... go to
SETUP/FX/INPUT... Verify that you have the Ac Transfer control set to
Gen. 

Make sure that you have adjusted the transfer delay cycles in the right
screen...  ADV/FX/GEN under Transfer delay cycles... I would set this to
0. 

As Mick said.. Check the Lower limit on the AC Voltage...  ADV/FX/GEN...
AC2 Gen Lower Limit I would adjust this up to 110-112? 

What does he have the cool down timer set to?  

I would suggest 5-10 minutes Look under... ADV/MATE/AGS/SETUP...  I
would set this to at least 5-10 minutes just to let the genset cool off
before shutting off. 

Steve Higgins. 

Sr Application Engineering Mgr

Sub-Saharan Africa Business Dev Mgr. 

Outback Power Systems. 

19009 62nd Ave Ne 

Arlington Wa 98223

360-618-4313

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of William
Miller
Sent: Monday, June 14, 2010 10:32 PM
To: RE-wrenches
Subject: [RE-wrenches] Gen set problems

Wrenches:

I have a customer that has a problem with a new generator.  He has two
VFX3648 inverters in Outback stacking.  He acquired a new generator, a
Kohler 12RES, a reputable make and model.  Below is a description of the
problem:

The 12RES seems to be operating OK except for one problem.  At the end
of a charging cycle, when the gen automatically shuts down and load goes
back to the inverters, all lights, TVs, etc., flash, one TV shuts off,
and a GFI trips.  This has happened every time.  It did not happen with
the 15RES or the smaller back-up gen (which was disconnected manually).
With the 15RES the same GFI would occasionally trip while the unit was
charging and handling house load, but never at the auto shutdown point.
I replaced the GFI, but it still trips.  There are three GFIs in the
house, but only one--always the same--trips.

I suggested he adjust the AC2/Gen transfer delay to a lower number.  He
reduced it to minimum and this did not resolve the problem.  I also had
him verify that the AC source is selected as generator, which it is.

Do you have any suggestions?

Thanks in advance,

William Miller

Please note new e-mail address and domain:

William Miller 
Miller Solar
Voice :805-438-5600
email: william at millersolar.com
http://millersolar.com
<http://millersolar.com/> License No. C-10-773985

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