The green/yellow wire is ground, and the blue and brown wires are the power wires for the Grundfos Pump. The pump works with 30-300VDC or 90-240VAC power, and it doesn’t matter which way the two power wires are connected on the Grundfos CU200 controller. As long as the ground wire to Grundfos pump is located in correct position on CU200 controller then the two power wires can be connected in either terminal.
How do i wire the Grundfos CU200 controller
