1.frequency inverter converter multi-function,high torque 2,accurate,stable 3.manufacturer 4.CE ISO9001 Technical characteristics1.perfect matching for fan and water pump,it is able to control 7(6+1)sets of pump at most2.circulated soft starting function,internal intergrated clock chip,convenient for timing control 3.It is able to set six pressure segments everyday,adapting to change of actual ...