A
Hi everyone here,
We have a 2-wire differential pressure ABB transmitter (0-2 bar), and supplied by (29 VDC).
The problem is that: the operators said there was a different readings between the DCS and local screen of the transmitter. I've checked it on the site, and found there was some water leaking inside the transmitter. Then I dried it up after removing the supply wires, and then I get the wires back, but unfortunately it doesn't power up again. While I've tested it with an external 24 v source, it does work ok. I guess the problem lies somewhere either in the PLC's analog input card (S7-300) or the supply cable.
Would anyone lend me a hand, and help me on how to test the Analog Input terminals assigned to this transmitter?
Note: After taking the supply wires back in the transmitter , I measured the voltage. it has been about 3.4 v (rather than 29 v). when I take them off the transmitter, it reads (29 v)again. What is the reason do you think behind such voltage drop?
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Thank you so much in advance..
My best regards.
We have a 2-wire differential pressure ABB transmitter (0-2 bar), and supplied by (29 VDC).
The problem is that: the operators said there was a different readings between the DCS and local screen of the transmitter. I've checked it on the site, and found there was some water leaking inside the transmitter. Then I dried it up after removing the supply wires, and then I get the wires back, but unfortunately it doesn't power up again. While I've tested it with an external 24 v source, it does work ok. I guess the problem lies somewhere either in the PLC's analog input card (S7-300) or the supply cable.
Would anyone lend me a hand, and help me on how to test the Analog Input terminals assigned to this transmitter?
Note: After taking the supply wires back in the transmitter , I measured the voltage. it has been about 3.4 v (rather than 29 v). when I take them off the transmitter, it reads (29 v)again. What is the reason do you think behind such voltage drop?
---------------
Thank you so much in advance..
My best regards.