You can use the WebAdmin Interface to configure the Chronos component. Open the General pages in the Settings realm, then open the Others page:
Log: Use this setting to specify the type of information the Chronos component should put in the Server Log. Usually you should use the Failure (unrecoverable problems only), Major (Chronos task completion reports), or >Problems (failures, completion reports, and non-fatal errors) levels. When you experience problems with the Chronos component, you may want to set the Log Level setting to Low-Level or All Info: in this case the Chronos processing internals will be recorded in the System Log. When the problem is solved, set the Log Level setting to its regular value, otherwise your System Log files will grow in size very quickly. The Chronos component records in the System Log are marked with the CHRONOS tag.