Hi Riu Li,

Now, add 0.28 Na+ ion to your system.

Check your topology, it doesn't add up somewhere. The sum of the
partial charges should be integer (taken into account a rounding
error).

Cheers,

Tsjerk

On 4/23/07, Rui Li <[EMAIL PROTECTED]> wrote:
Dear all,

When I use grompp,it warns:
NOTE:
  System has non-zero total charge: 1.172000e+01

So I add 12 Cl- in my system.
Then I use grompp again,it warns:
NOTE:
  System has non-zero total charge: -2.799983e-01

How can I make the total charge zero?




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--
Tsjerk A. Wassenaar, Ph.D.
Junior UD (post-doc)
Biomolecular NMR, Bijvoet Center
Utrecht University
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