PhaseShift
Senior Member
Can someone tell me what the difference between a 3-wire and 2-wire RTD is? What does the third wire do?
Also I have seen a case where one of the wires (maybe the 3rd wire) is connected to a common bus with wires from other multiple rtd's on the same motor. The third wire going back to the instrument was also connected to this bus. Is this correct? In one case this common bus was grounded.
Also I have seen a case where one of the wires (maybe the 3rd wire) is connected to a common bus with wires from other multiple rtd's on the same motor. The third wire going back to the instrument was also connected to this bus. Is this correct? In one case this common bus was grounded.