Issues regarding the wiring from the ITCC to the turbine electro-hydraulic converter
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Hello everyone. I would like to ask why 4 wires are used for the control signal wiring from the ITCC (Triconex) system distribution cabinet to the electro-hydraulic converter at the turbine site. I’ve heard that the electro-hydraulic converter has two coils; so do these two pairs of wires each transmit half of the 4–320 mA current? It means something else, such as differential current, for example. Also, I would like to ask: after the turbine is tuned up and put into operation, will a current of 320 mA actually be used? How can one determine the actual control current range of a turbine valve that is already in use? Thank you!
This post was last edited by ssln123 on 2017-12-30 09:58. One wire is supposed to provide 24V DC, another outputs a speed control signal of 4-20mA, another one is for position feedback; the purpose of the fourth wire is not clear and requires reference to the manual.
The 4 wires for the control signal of the electro-hydraulic converter: 2 control signal wires, 2 power wires, and 7 wires for the electro-hydraulic converter itself.