Answer / satishkumar

first, check the SOV coil is working or not and then check
the power supply from DCS to sov coil.

Answer / raffi

Signal(Soft PB) for SOV to open in Manual and Auto are same (DO)
While your are running in AUTO. it is working with interlock/logic i.e feedback from other IOs

While in Manual mode you should press the SOV button to open after change the mode to manual

If it not working in AUTO then Check the malfunction of feedback signal IO card or carryout the loop checking for feedback signal to sort out the issue

Answer / fellyc

Assume that both Manual Command (PB) and Auto signal comes
from the DCS ( Same DO).
If it works in Mamual Mode and not in Auto Mode, then check
the logic for an interlock or permissive.

Answer / ganapathi s.b

First check DO out put came or not. if signal not come check Do module, if signal came then check sov coil Resistance value
either open or short.this is main problem of not working in Auto mode.

Answer / raja

Need to be check the DCS I/O cart the DI cart digital output cart some time give fault signel the I/O cart malfunction

Answer / sriram

Either manual mode u operate from dcs then the DO card is good. so check the interlock

Answer / hansdas b.jaiswal

If you are operate solenoid valve with out load so please
connected it a power cylinder or actuator some time
solenoid valve not works in auto mode with out load.

Answer / govarthan

whether card is not working sov not working in man mode also i think ter s an external interlock check it..

Dead weight tester & comparator for calibration , which is more accurate , what is the application.

1 Answers   Bapco Bahrain Petroleum Company,

Can any body tell me about SAP MAINTINANCE MODULE. WHAT IS its function and application. And study material Source about it. I shall be very thankful.

0 Answers  

For 150 mtr cable run from DCS panel to transmitter (24 VDC with 4-20 ma output), need cable size. 1.5 sqmm is suitable?

2 Answers   NA,

PLS TELL ME THE FUNCTION OR PRINCIPLE OF CREEP RELEIF VALVE..

3 Answers  

i want formula for flow control.am doing project in flow control using orifice . i know value of the flow level(Q) . upstream(p1) pressure, orifice diameter(Do) , pipe diameter(Di) and oil viscosity(Vi) how can i calculate downstream pressure

0 Answers  

How will you change the action of a control valve?

1 Answers   CCIE,

in split range control system we are using two control valves,but we have only one positioner and one feed back link.so how we use this one feed back link for two control valves?

2 Answers  

how to calculate range of Dp transmitter

1 Answers  

what is output of FOUNDATION FIELD BUS transmitter

0 Answers  

CAN YOU USE MOVING COIL METER FOR MEASURING A.C?

2 Answers   DVC,

what is axial shift n what is differential expansion in turbine? how many sensor probes r mounted for this n how it works?

2 Answers   Apple,

key phaser where is use and work

0 Answers   BAP,