Matthias,
The Fortran runtime error means that the program has attempted to take the log of a number outside the domain of the function (typically a number less than or equal to zero).Running Type 1223, for some input values TRNSYS stops and the following error message appears. (See attachment) What should I do? Any suggestions?
As usual, the first step is to check your parameters and input/output connections, use the TRACE command to check the inputs/outputs, try constant-input cases, and use the debugger (if you are familiar with the debugger it might be the fastest option, even to detect a wrong parameter...). I would put a breakpoint before the lines you suspect of being the cause of the problem and go step-by-step from there.
In case of "Type 1223", which I assume is the "Detailed Chilled Water Cooling and Dehumidifying Coil by S. Gabel" in ASHRAE's secondary toolkit, you seem to be lucky because I only found two calls to the log function (in the SATPRESS subroutine). Both take the log of a temperature in Kelvin, which could indicate that you have a unit problem (deg C instead of K) or that something in the simulation causes the temperature to go below the absolute zero. This, of course, only holds if the error occurs in Type 1223 (it might be a problem caused by Type1223 that generates the log domain error in another Type).
Good luck, Michaël Kummert -- _________________________________________________________ Michaël Kummert Solar Energy Laboratory - University of Wisconsin-Madison 1303 Engr Res Bldg, 1500 Engineering Drive Madison, WI 53706 Tel: +1 (608) 263-1589 Fax: +1 (608) 262-8464 E-mail: kummert@engr.wisc.edu SEL Web Site: http://sel.me.wisc.edu TRNSYS Web Site: http://sel.me.wisc.edu/trnsys