Run time of my script in php only lasts 30 seconds

I have the following problem when I run my script in php only lasts 30 seconds cutting the same that is not an excess process, what happens is that I am importing information and probe changing in ini :

max_execution_time=300
max_input_time=600
memory_limit=256M

also on command line

ini_set('max_execution_time', 300); 
set_time_limit(300);

The worst thing is that by checking the configuration of php.ini the directive if you show it to me with the change, the safe_mode is in off .

I can not think what else to do.

Thanks