One control three constant pressure water supply frequency conversion speed control circuit a

1 and 2 are fault output terminals ; 6 and 7 are analog feedback current input terminals; 6 and 8 are analog output
terminals; 19 and 20 are forward running terminals; 11 and 20 are programmable digital output terminals . The working principle is similar to Figure 5-23,
except that it only controls three motors.