It’s confusing the experienced technicians – the wiring for KCD2-STC-EX1
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This post was last edited by windsorwin1 on 2017-6-24 10:42. Should the four-wire Hart transmitter be connected to terminals 1 and 2, or to terminals 3 and 4? Could someone provide a more authoritative explanation for this diagram? Which two terminals are connected to 2 wires, and which two terminals are connected to 4 wires?
The green part is the safety barrier, the blue part is the display area; the signal output is connected to terminals 3 and 4, and HART can be connected directly to these two terminals to enable operation
1, 2 connect to passive signals (such as two-wire transmitters)； 3, 4 connected to active signals (such as four-wire instrument outputs)
Single-channel safety barrier, input (1,2 passive, 3,4 active； (Choose 1 of 2) Output 5,6
Only those with a four-wire output are passive signals; passive and active cannot be confused
1 and 2 are active two-wire systems; the four-wire system uses 1 and 2 for power supply, while 3 and 4 serve as passive input signals. 5 and 6 represent the output current, and 5 and 7 represent the output voltage, which is a voltage signal in the range of 1–5V
1.2 is connected to passive signals, that is, 4-20mA signals with a 24V voltage applied to them; 3.4 is connected to active signals, that is, four-wire instruments