... it also covers the most common advanced technology: PLC, frequency converter, encoder, step motor, servo motor and automation ... System compositionXK-MX6B model is composed of three-pump frequency conversion constant pressure water supply subsystem, PID control liquid ... DC/DC1 pcs2DP interface moduleEM2771 pcs4) Frequency converter: Siemens MM 420 series frequency converter.5) Touch screen: WEINVIEW ...