Posts from...
Today, Thursday, October 30, 2014
Topic: Information resources, documentation.
from the Forum department...
Instrument Learning Materials?
Posted by Dave on 30 October, 2014 - 7:54 am
New instrument engineer, could use some help!
Topic: Power generation equipment control.
from the Power generation department...
Generator and Capacitor Bank
Originally posted by fluidflow on 22 July, 2014 - 1:04 am
Totally stumped by the recent brawl over utility of capacitor bank in power generation.
New Replies:
Some useful information. Take care G.Rajesh...
FF... Please play particular attention to Candl_Pete's excellent post. He was able to illustrate...
FF, further to my earlier post, see the following Control.Com thread: ...
FF, problem is clearer. Following is a summary, based on information provided to date: A)...
Topic: Power generation equipment control.
from the Operations department...
Steam turbine shutdown
Originally posted by C. Reihl on 25 October, 2014 - 7:52 pm
What is the proper sequence for shutting down a combined cycle plant? Gas turbine or Steam Turbine first?
New Replies:
Hey! At our 2x1 plant we have 2 GE MS7001FA's exhausting to HRSGs that provide steam to an...
this makes no sense to me! How do they maintain enough steam to operate the turbine? Do they close...
I'm an combined cycle operator and We shutdown the steam turbine before the Gas turbine. the reason...
Topic: Continuous process industries, DCS questions.
from the Forum department...
Blockage in Impulse Lines/ Filling Glycol
Posted by Nasser on 30 October, 2014 - 3:23 am
What is the best practice when you have blockage in impulse lines for flow transmitter how can clear the blockage?
what is the best equipment to fill glycol in level dp cell in both H & L sides?
Topic: PLCs and related questions.
from the Maintenance department...
Issue with a Siemens 331 AI card
Originally posted by Chris on 28 October, 2014 - 8:31 pm
Experiencing an issue with an output on an AI card. Have a valid analog signal from the field device to the remote I/O PLC, but nothing from there to the control PLC.
New Replies:
Measure the voltage to ground at the AI terminals. It sounds to me like the voltage is outside what...
Hello David, Thank you very much for the response and I apologize for the lack of information...
You haven't told us what kind of signal is coming from the level transmitter (presumably 4-20mA),...
Topic: Engineering and workplace issues.
from the Instrumentation department...
Why shield should be at one end in cabinets
Originally posted by Sudheer on 13 July, 2013 - 10:38 am
When instrument shield connection to ground, why connect at one end of the cable, especially internal cables?
New Replies:
You can do whatever you want with your shields:^). The idea behind grounding one end only is that...
Srbg, What you are describing is entirely possible--and would be correct as long as the shield...
Thanks for the info. I am particularly interested in why cannot we make our shield continuous...
Topic: Engineering and workplace issues.
from the Forum department...
Grounding Current Transformers
Originally posted by gautam on 29 October, 2014 - 1:17 am
Need for grounding of secondary terminal of current transformer.
New Replies:
Gautam... Q1: The ground-terminal protects endangerment of human life if there is a...
It serves several purposes, one being safety in case of an insulation breakdown. Since the...
Topic: Sensor technologies.
from the engineer department...
Radar Level Transmitter in Fiber Board Factory
Posted by helen on 29 October, 2014 - 11:06 pm
Is radar level transmitter suitable for fiber board factory?
Originally posted by John Correa on 28 October, 2014 - 10:55 pm
Are there some useful technician instruments for finding faults in electrical equipment
New Replies:
You can make some really good guesses with a voltmeter. If the ends show a low voltage there's a...
Topic: Communications systems and equipment.
from the Solar department...
Modbus Training Courses
Originally posted by Kyle on 19 December, 2013 - 9:37 pm
Looking for Modbus training courses
New Replies:
I created a course on uDemy called Mastering Modbus RS485 Network Communication for persons wanting...
Topic: Communications systems and equipment.
from the Forum department...
RS485 to Analog Input Conversion
Originally posted by cherrypi on 20 October, 2014 - 3:38 am
Is it possible to convert (multiple) readings being transmitted through RS-485 communication to analog signals?
New Replies:
Thank you Walt. I do agree with you, however the powers-that-be still requested for the research to...
Thank you Curt! This is exactly the kind of stuff I was looking for....
Topic: Communications systems and equipment.
from the Forum department...
SLC500 Communications with Unitronics PLC
Originally posted by Rodger on 17 October, 2014 - 1:38 am
Setting up communications between a Unitronics PLC and SLC 500 PLC
New Replies:
I think the simplest thing to implement here would be Modbus. The Unitronics can be a Modbus master...
Topic: Power generation equipment control.
from the Thermal Engineering department...
Thermal Efficiency Improvement of a Combined Cycle Power Plant
Posted by Sreesankar J on 29 October, 2014 - 3:18 am
Thermal Efficiency Improvement of a Combined cycle power plant by absorbing excess Flue gas temperature without altering any design parameters.
Topic: Engineering and workplace issues.
from the ELECTRICAL/INSTRUMENTATION department...
Why IRP Used for Interface Between DCS and MCC
Posted by VINNY on 29 October, 2014 - 12:50 am
Why is an IRP panel is used between DCS and MCC?
Posted by Josh on 28 October, 2014 - 11:58 pm
The consequence to run cathodic protection DC cable and instrument cable (most 24 VDC) cable in same cable tray.
Topic: Power generation equipment control.
from the Forum department...
Changing SRV Valve setting
Originally posted by 8784597 on 16 October, 2014 - 4:28 pm
I need help to change the set point for SRV open position.
New Replies:
rwailikhalid, FPRG is a control signal database signal name for P2 Pressure Reference (Fuel...
where i can find FPRG?...
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Citect Modnet driver
Originally posted by kk on 19 February, 2014 - 12:43 pm
MODBUS TCP I/O driver modnet not responding to input discrete tags, but is able to read all analog input register data and able to respond to output discrete tags.
New Replies:
Hi i use multiple modnet device for my I/O device. The problem is the output response...
Topic: Power generation equipment control.
from the Power Generation department...
Gas Turbine control - Hardware Part Trip of L4
Originally posted by Neo on 19 October, 2014 - 8:02 am
When Hardware causes the trip of L4
New Replies:
Neo, I'll try to answer your questions, but I'm not clear on at least one of them. Yes; you...
Very happy to see the detailed discussion. Go ahead for great success. Take care G. Rajesh ...
CSA: I read and reread your response,and it really helps! And thanks for your drawings. ...
Originally posted by mohanad on 26 October, 2014 - 1:48 am
I want to send a signal via MODBUS to Emerson DCS
New Replies:
CuriousOne, If I only had a nickel for every time I have heard that refrain I would be a very,...
It is a simple as changing a couple of text files and restarting interfaces....
Topic: Information resources, documentation.
from the Fire alarm department...
Speaker Strobe for Class 2 Div 1 Rated Area
Posted by Bob on 28 October, 2014 - 10:31 am
Explosion proof/dust proof equipment needs
Topic: Local and wide area networking in factory automation.
from the LITTLE GRASSHOPPERS department...
MODBUS Radio Network
Originally posted by JIMMY SALDIVIAS on 26 October, 2014 - 10:29 am
How many radio receivers do I need in a MODBUS EIA-485 network using VERIS H8830?
New Replies:
Thank you Koen for your help. Where can I get hands on a document who explains how these radios...
Routing is automatic. All H8830 devices create one RS485 network so all devices on the RS485...
Topic: Power generation equipment control.
from the Instrumentation department...
Mark V A6 state
Originally posted by G.Rajesh on 22 October, 2014 - 12:33 pm
Mark V <C> at A6 state after modify and download IO.ASS and IOCFG
New Replies:
Thanks Bob for your feedback. No we couldn't locate the card as when it was at A6 and found...
Topic: Engineering and workplace issues.
from the INSTRUMENT department...
Grounding Problem in Siemens DCS
Originally posted by RAJESH on 26 October, 2014 - 4:50 pm
In DCS panel the resistance measured between power earth and signal earth vary from 24 ohm to 160 ohm in different panels.
New Replies:
My apologies, I see now that I misread your post. You should not have that much resistance...
You need to be specific not only with the resistance magnitudes you describe but also how you are...
> resistance between power earth and signal earth is varying from 40 ohm to 120 ohm. It...
Topic: Engineering and workplace issues.
from the Automation Safety department...
AB or Siemens Equivalent Safety Product as Sick's Flexi-Loop
Originally posted by Weida on 23 September, 2014 - 11:49 am
Is there any Allen Bradley or Siemens safety product that has similar modular capbilities as Sick's Flexi-Loop system?
New Replies:
Looking forward to reading more. Great article. Much thanks again. Much obliged....
Topic: Information resources, documentation.
from the Forum department...
Electric Motor Driven Actuator
Originally posted by Qasem on 26 October, 2014 - 8:10 am
Actuated valve in remote location where no instrument air availability.
New Replies:
what is the valve controlling/modulating? There are many options. Rexa has options that are all...
Topic: Communications systems and equipment.
from the ModbusTCP department...
PROSOFT MVI56-MNET Slave Response Time
Originally posted by Cris on 17 September, 2014 - 2:27 pm
PROSOFT MVI56-MNET communication response time and performance
New Replies:
I just tested this with Modscan32 and the MNET unit was replying as fast as Modscan32 could request...
Topic: Power generation equipment control.
from the DLN combustor department...
Humming in DLN combustor V94.3A
Originally posted by GTEGAT on 3 June, 2009 - 2:14 am
How to fix the humming in combustion chamber when Gas turbine is loading or unloading.
New Replies:
Your GT should have low frequency humming (10-30Hz). If it is the case you should check if the...
Topic: PLCs and related questions.
from the Petroleum Refinery. department...
Analog Input Cards for Programmable Logic Controller.
Originally posted by Mr. Samar on 25 October, 2014 - 2:53 am
PLC card - High Channel density drawbacks.
New Replies:
Is the resolution the same on the 16 and 32? If so the 32 may react a little slower depending on...
Topic: Human-Machine Interface and SCADA.
from the I might be wrong but I doubt it. department...
Thoughts on High Performance HMI
Originally posted by ih on 24 October, 2014 - 7:56 pm
How to implement the ideas in the book "The High Performance HMI" without meddling in code layer?
New Replies:
The effort is worth it, if you have the right goals defined at the start. Easier training of new...
Topic: Power generation equipment control.
from the Protective Relaying department...
Transformer Differential Relay Protection during Open-Phase
Originally posted by Amrit Pandey on 17 October, 2014 - 4:55 pm
Transformer Differential Relay Protection during Open-Phase. Possibility of the relay to trip during line to ground fault or open conductor outside the zone of the differential scheme?
New Replies:
Phil, I am emailing you my excel sheet and wiring diagrams. -Amrit...

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