Interested to Buy Any Domain ? << Click Here >> for more details...
what sud u do if u dont get feedback from control valve?
- 1 Answers
- 7435 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / carl_ellis
There's two kinds of feedback from a control valve:
a) the change of the process variable because the valve
position changes
b) position feedback directly from the positioner to the
controller/control system.
We'll assume that the question is directed at the loss of
position feedback signal from the loop's positioner.
1) Position feedback cards are options on smart
transmitters and need to be initialized after installation.
Has it been initialized?
2) DC power is typically loop power for position feedback.
Is the loop power supply still functioning?
3) Has the position feedback card or its wiring been
disabled or removed?
4) If the position feedback loop is intrinsically safe, is
the loop's I/S barrier open circuited?
5) Has the loop wiring been changed in some manner so as to
affect the position feedback signal integrity?
Carl Ellis
Measure First
| Is This Answer Correct ? | 8 Yes | 0 No |
Post New Answer View All Answers
please send data bank of quetions answers on analytical instrumentation.
Why are the uses 24vdc in industries
What is exact difference between the panel earthing and system earthing in DCS system. What is the value of resistence.
Which Signal hart communicator work? If there any signal change when hart connect while transmitter in line ?
in differential pressure transmitter,min&max pressure range for hp&lp
What is the basic difference between Modbus and CAN Open Protocols
what is the usage of QDV & VOLUME BOOSTER
The Design Calculation of Level Transmitter For Different Structure open & Closed Vessel, Eg. Diff. Level Tx., Capacitance For Continous Operation
1. what is modbus cable? 2. what kind of communication we are using for the interface of DCS, ESD and Third party cabinets? 3. What is serial communication and peer to peer communication?
Isometric drawings are generated during _________________ phase of a project
why is not useing in boiler skin thermocople
Decibel.
give some question relative instrument fitter?
how is work pressure switch& level switch?what is the principle of this?
Explain pH, Conductivity.
