Posts from...
Today, Tuesday, September 23, 2014
Topic: Power generation equipment control.
from the Gas Turbines department...
What Is CEMS Used For?
Originally posted by Daneezy on 20 September, 2014 - 3:53 pm
What is CEMS used for and how does it operate in Power Generation gas turbines (GE Frame 9e)?
New Replies:
> thanks a million..nice contribution.. Happy you were satisfied! Wish we understood why...
thanks a million..nice contribution.....
Just some clarification.... In general, a CEMS (Continuous Emissions Monitoring System) is a means...
The continous emmissions monitoring system is used to monitor the output of the exhaust stack. The...
Topic: Power generation equipment control.
from the Forum department...
excitation control
Originally posted by Kamel on 30 September, 2012 - 3:37 am
excitation control
New Replies:
One more answer: You did not say how much you say this MV auxiliary bus-bar voltage change. 10V?...
One more question: where is the limit point between Generator terminals and grid? The other...
Topic: Power generation equipment control.
from the Power Generation department...
When Will 88CR start?
Originally posted by Neo on 10 September, 2014 - 10:27 am
GT start up sequence, when will 88CR get started?
New Replies:
Neo, It would probably be better if you asked off-topic questions like this in new, separate...
CSA: Before reading your last response, I want to ask another question. I have this discussion...
Neo,
 >  L3RS    L1S       L4       L1XX    L5EX   L3SFLT    L1X
...
CSA: Thank you so much for your detailed and helpful response. After reading your response...
Neo, You didn't post L1X.... It's kind of critical to the whole discussion. And, it's also kind...
Originally posted by Arosha on 21 September, 2014 - 9:55 am
What is the standard to connect multiple remote ESTOPs serially to Estop Monitor Relay
New Replies:
One thing to remember is if you are using 24 VDC E-Stop circuits, the length of cable becomes...
I doubt there is any international standards for such things. The main issue may well be that...
Topic: Power generation equipment control.
from the Forum department...
Gas Turbine Effect on Refrigeration Cycle
Originally posted by Sadiq on 22 September, 2014 - 2:27 pm
How does gas turbine efficiency effect the refrigeration cycle?
New Replies:
Sadiq, If I understand the question correctly, the efficiency of the gas turbine will not have...
Topic: Engineering and workplace issues.
from the Automation Safety department...
AB or Siemens Equivalent Safety Product as Sick Flexi-Loop
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?
Topic: Power generation equipment control.
from the Generator Control department...
Generator Voltage
Posted by TexasPower on 23 September, 2014 - 11:22 am
What determines how fast the voltage collapses if you remove the field current?
Originally posted by Daneezy on 22 September, 2014 - 4:48 pm
Please what is the difference between a standard combustor and a DLN combustion system?
New Replies:
Daneezy, First of all, there are many "flavours" of DLN--and while some of them are...
Topic: Application Questions and Problems
from the Water Treatment department...
Chlorine Pacing for Water Treatment Plants
Originally posted by Don Best on 26 June, 2001 - 7:59 pm
What kind of control strategy is most often used to pace chlorine (Sodium Hypochlorite) at a Water Treatment Facility or Reservoir?
New Replies:
The thing is that you need to decide what your dosage rate per GPH is and work backwards from...
Thank you for this post. It helps me a lot on how to control the pump speed and stroke for sodium...
Topic: PLCs and related questions.
from the Forum department...
Encoder input module in PLC
Originally posted by sensorless on 23 September, 2014 - 4:58 am
For a 1700 ppr encoder input, is it necessary to use a High Speed Digital Input module in PLC?
New Replies:
You have to look at a couple of things. One is whether you need a quadrature signal or whether a...
Topic: PLCs and related questions.
from the Forum department...
Synchronizing Two ABB DCS Controllers
Posted by haroon0023 on 23 September, 2014 - 3:47 am
One type of status reading of ABB DCS says they are Synchronized, but other says they are 35% in Synchronized.
Topic: Human-Machine Interface and SCADA.
from the Forum department...
Web based HMI for Greenhouse
Originally posted by Bogaat on 20 August, 2014 - 1:41 pm
Looking for an affordable OPC Web based HMI solution
New Replies:
We have a NAP OPC system. We also have a Touch HMI-PLC used on greenhouses as well as data logging....
The easiest way to build your own web UI is to use Opto22's Groov. Its a browser based operator...
Topic: Power generation equipment control.
from the Automation List department...
What makes a generator increase load
Originally posted by kumarash on 10 August, 2008 - 3:49 pm
What makes a generator coupled to a gas turbine increase load when load raise command is issued to Mark V
New Replies:
You are right. I think an easier way to look at it would be through water turbines. here is how: ...
Topic: Continuous process industries, DCS questions.
from the Instrumentation department...
Thermocouple Temperature Drops Suddenly
Originally posted by Litto on 22 September, 2014 - 2:06 am
Unexplained temperature drop while process is running
New Replies:
A drop to 100 is indicative of a short creating a false junction. A drop to zero is indicative...
If you are dealing with 950C as opposed to 950F, it could be a problem with the thermowell or the...
Somewhere between the hot junction and the analog input there's a short circuit in the extension...
Topic: Engineering and workplace issues.
from the No Power Source At the Tank department...
Wanted: Simple and Inexpensive Automated Pump Control System Solution
Originally posted by M Jensen on 4 January, 2012 - 9:10 pm
Looking for a simple and inexpensive pump control system to automatically fill water tank. No power source at the tank. Pump is 700 meters from tank.
New Replies:
I am the original poster and am grateful for all the suggestions, expert advice, and links to...
We are working on such a kit. Our preliminary designs have proved to work at 1.5 miles away with...
Topic: Sensor technologies.
from the control department...
4 wire vs. 3 wire RTD
Originally posted by KAKIL on 3 October, 2007 - 12:00 am
What is the difference between 4 wire RTD and 3 wire RTD?
New Replies:
3 wire is more than adequate at that distance. your vendor can better inform you as it depends...
For a 10m cable, which is the best options? 2 wire/3 Wire/4 wire RTD. I am going to test the...
Topic: Software, including programming, OS issues, etc.
from the Forum department...
Sliding Mode Control - MATLAB
Posted by Andrew on 21 September, 2014 - 7:39 am
Need help simulating sliding mode controller using MATLAB/SIMULINK
Topic: Power generation equipment control.
from the Forum department...
Mark V Diagnostic Alarms
Originally posted by Ivan on 18 September, 2014 - 11:18 am
Mark V TMR control panel, MS5001P, Diagnostic Alarms
New Replies:
Hello everybody, I investigated this issue with SVL and DV sirnals during these holidays on...
Ivan, We had a similar problem last year. We we're getting Voter Mismatch alarms for SVL (Bus...
Often when cards are zapped by stray voltages, the isolation circuits (caps) can hold charge that...
I once had a lightning strike in the switchyard and somehow voltage managed its way to the 125DC...
Ivan, When the generator breaker is closed it's typical for GE-designed synchronizing circuits...
CSA, Today I have investigated this issue more deeply by myself and found the next: - All...
CSA, These alarms occur more often when generator breaker closed already (approximately every...
Ivan, When do these alarms occur? During normal full speed operation with the generator breaker...
Originally posted by Psahu on 18 September, 2014 - 10:49 am
Are controller tag details for control logix is available on ethernet/IP? Using 1756-EN2T module in controller chassis for communication.
New Replies:
Psahu, It is depend on what third party devices you would like to connect. Can you be more...
The Ethernet/IP protocal is well defined in the spec for it. Best bet is to either buy the spec and...
Topic: Engineering and workplace issues.
from the Software department...
Using MODBUS in Visual Basic 6
Originally posted by Riccardo on 29 August, 2005 - 4:49 pm
Tooling:
MODBUS device
Visual Basic 6 sp 6
Ethernet Communication Port 502
New Replies:
my name is James Lin ...... my email " mpjames573t@hotmail.com " ...
Topic: Software, including programming, OS issues, etc.
from the R & D department...
Enable Register Read in LabView
Posted by Ajay Waghmare on 20 September, 2014 - 3:44 am
When reading registers in MODBUS using LabViewm, how do I read data from registers at addresses 43XXX?
Posted by Beavis Cleavis on 19 September, 2014 - 1:07 pm
Bus contains isolated and non-isolated slaves. Considerations when connecting everything together?
Topic: Power generation equipment control.
from the Simulation department...
Automatic Volage Regulation
Originally posted by Dave on 6 August, 2013 - 1:25 pm
Question on the behavior of AVR after synchronization.
New Replies:
Engr.. Is it correct in saying that adjusting vars when operating in auto just changes generator...
Engr... Reur 29-May-14 post,"Can u explain please what happen in reality?" Are you...
Originally posted by connected on 14 September, 2014 - 2:31 pm
Problem with SCADA system that supervises electrical power flow for a residential building. Connected with Modbus RTU over RS485 daisy-chained 2-wire. The communication on the bus seems to be destroyed with Schneider PM750 connected.
New Replies:
> By the way,, does it exist any utility to check the serial interface of the Pm75? I'm thinking...
By Lynn August Linse on 18 September, 2014 - 4:08 pm -
If you expect lightning/grounding damage, what I have done a few times is power everything off...
I've been researching this problem today and tried both biasing of the bus, different common/shield...
Topic: Continuous process industries, DCS questions.
from the Forum department...
WDFP QLC Card Download
Posted by Kevin Williams on 18 September, 2014 - 12:27 pm
Problem downloading to QLC card with LC Loader
Topic: PLCs and related questions.
from the Forum department...
Yokogawa DCS Analog Module AAI143
Originally posted by Ariel on 15 September, 2014 - 2:45 pm
Difference between analog mA value and their correspondent raw value.
New Replies:
I checked the Tunning parameters and there is an error. Maybe is a good idea to do an offline...
Topic: Power generation equipment control.
from the Mechanical Engineering department...
Frame 9e Bearing Drawings
Posted by Mk6TA on 18 September, 2014 - 8:31 am
Bearing #1 drawings for a GE Frame 9e are missing.
Topic: Engineering and workplace issues.
from the Forum department...
DCS analog input problem
Originally posted by mahmoud fawzy on 4 September, 2014 - 7:10 pm
DCS Analog input signals didn't work with ADAM card
New Replies:
Mr. Fawzy, That's a very interesting observation. A common for all channels is what allows...
Topic: PLCs and related questions.
from the Instrument and Control department...
Siemens S5 CPU 922 Run and Stop LED Do Not Turn ON
Originally posted by Syed Waqar Azeem on 11 September, 2014 - 1:05 am
Run and Stop LED on front of Siemens S5 922 CPU doesn't turn ON on powering of rack. Only BASP LED on front of CPU is turned ON.
New Replies:
We have started getting a fair number of service calls for S5 units. They are closing in on thirty...
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:
Hint - prosoft has very good tech support....

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