Apertif: lessons learned operating a Phased Array Feed array

Apertif is the phased array feeds (PAFs) system operational on the Westerbork Synthesis Radio Telescope. This paper will cover various aspects of the system describing how the instrument is operated on a daily basis. Focus will be given to the use of new technology adopted for the hardware monitoring, automation of operational routines, calibration of the instrument and the results and lessons learned by operating it.