[RE-wrenches] Help me understand Gen vs XW

[Sandra.Herrera at schneider-electric.com]

Hello Wrenches, 

There are certain generators which the XW series inverters find very 
difficult to qualify. This is due to the fact that generator coils are 
wound in different ways, and even though you may have the voltage and 
frequency within specs, there are additional high frequency harmonics on 
the generator output that will cause the XW inverter not to accept it. 

The critical area of the generator waveform is "zero cross"  if there is 
ringing at zero cross the generator waveform frequency looks like a 
multiple of 60 Hz. The scenario would be rejected by most inverters and it 
is correctable using a 15uF 360 VAC oil filled motor run capacitor.
This distortion is greatest for an unloaded generator. Typically the wave 
smooths out under load. As mentioned here before you could add a load to 
the generator to prove this point, or check the waveform with an 
oscilloscope. I know this is not a permanent solution, but it is a good 
troubleshooting step.
I don’t disagree with my tech support colleagues about updating the 
firmware to V1.07, the changes made on this rev. makes the XW more 
tolerant to generators waveform.
To get the latest firmware rev. you can go to our website or email me 
directly.
Thank you for the opportunity to participate on the wrenches list,
_____________________________________________________________________________________ 


Sandra Herrera  |   Schneider Electric   |  Renewable Energies Business  | 
  UNITED STATES  |   Sales Application Engineer 
Phone: +425-263-0211  |   
Email: sandra.herrera at schneider-electric.com  |   Site: 
www.schneider-electric.com  |   Address: 161-G South Vasco RD, Livermore, 
CA 94551 USA 

*** Please consider the environment before printing this e-mail 




From:
jay peltz <jay at asis.com>
To:
RE-wrenches <re-wrenches at lists.re-wrenches.org>
Date:
09/09/2011 09:59 AM
Subject:
Re: [RE-wrenches] Help me understand Gen vs XW
Sent by:
re-wrenches-bounces at lists.re-wrenches.org



Agreed but it will help with diagnostics.



jay 

peltz power
On Sep 9, 2011, at 9:08 AM, William Miller wrote:

Jay:

I disconnected the AGS and the problem persisted.  Adding a load may help 
but I did not test this.  This would require a permanent load and might 
not be desirable.

William





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