Direct drive system for electric servo pump 1.PC pump,Beltless,Reverse rotation prevented 2. ... Stars Progressing Cavity Pump Pumping Units, Direct drive system for electric servo pump---NAS-B SeriesThis system contains Control cabinet, Servo driver and AC ... designed by Stars itself, matching perfect, service convenient. Main Parameter System Series SML Control cabinet Model No. HX-600HX-1000HX-1500 ...