Detailed Product Description HPS2DN15...840 series is a sort of current-controlled intellectual soft starter newlydesigned on the basis of HPS2S, HP2D/DH and adopting the most advanced digitalprocessor to regulate voltage. Its unique intellectual electronic circuit providesperfect controlling and protective functions: linearity acceleration start,pump start, pump stop control, preset low voltage operation, preset both of parameters for soft start and soft stop and switch each other freely, monitor loadstatus and automatically change to the light -load and energy-saving pattern,protective function of testing motor insulation, phase loss, short circuit, protectionagainst over-load, etc. With RS 485 and Profibus protocol, which realizesfull micro-controller and monitoring.