Posts from...Today, Tuesday, September 23, 2014
from the Gas Turbines department...What Is CEMS Used For?
What is CEMS used for and how does it operate in Power Generation gas turbines (GE Frame 9e)?
> 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...
By 309EGuy on 21 September, 2014 - 6:25 am -
The continous emmissions monitoring system is used to monitor the output of the exhaust stack. The...
from the Forum department...excitation control
One more answer: You did not say how much you say this MV auxiliary bus-bar voltage change. 10V?...
By Mine on 20 September, 2014 - 8:42 am -
One more question: where is the limit point between Generator terminals and grid? The other...
from the Power Generation department...When Will 88CR start?
GT start up sequence, when will 88CR get started?
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...
> 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...
from the Forum department...Emergency Stop Wiring for Multiple Remote ESTOPs
What is the standard to connect multiple remote ESTOPs serially to Estop Monitor Relay
By Russ Kinner on 23 September, 2014 - 12:50 pm -
One thing to remember is if you are using 24 VDC E-Stop circuits, the length of cable becomes...
By Bob Peterson on 21 September, 2014 - 12:41 pm -
I doubt there is any international standards for such things. The main issue may well be that...
from the Forum department...Gas Turbine Effect on Refrigeration Cycle
How does gas turbine efficiency effect the refrigeration cycle?
Sadiq, If I understand the question correctly, the efficiency of the gas turbine will not have...
from the Automation Safety department...AB or Siemens Equivalent Safety Product as Sick Flexi-Loop
Is there any Allen Bradley or Siemens safety product that has similar modular capbilities as Sick's Flexi-Loop system?
from the Generator Control department...Generator Voltage
What determines how fast the voltage collapses if you remove the field current?
from the Gas skid department...Difference Between Standard Combustor and DLN Combustion
Please what is the difference between a standard combustor and a DLN combustion system?
Daneezy, First of all, there are many "flavours" of DLN--and while some of them are...
from the Water Treatment department...Chlorine Pacing for Water Treatment Plants
What kind of control strategy is most often used to pace chlorine (Sodium Hypochlorite) at a Water Treatment Facility or Reservoir?
By Bob Peterson on 23 September, 2014 - 9:47 am -
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...
from the Forum department...Encoder input module in PLC
For a 1700 ppr encoder input, is it necessary to use a High Speed Digital Input module in PLC?
By Bob Peterson on 23 September, 2014 - 9:41 am -
You have to look at a couple of things. One is whether you need a quadrature signal or whether a...
from the Forum department...Synchronizing Two ABB DCS Controllers
One type of status reading of ABB DCS says they are Synchronized, but other says they are 35% in Synchronized.
from the Forum department...Web based HMI for Greenhouse
Looking for an affordable OPC Web based HMI solution
By ICPDAS on 22 September, 2014 - 6:53 pm -
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...
from the Automation List department...What makes a generator increase load
What makes a generator coupled to a gas turbine increase load when load raise command is issued to Mark V
By rafael on 22 September, 2014 - 3:29 pm -
You are right. I think an easier way to look at it would be through water turbines. here is how: ...
from the Instrumentation department...Thermocouple Temperature Drops Suddenly
Unexplained temperature drop while process is running
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...
from the No Power Source At the Tank department...Wanted: Simple and Inexpensive Automated Pump Control System Solution
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.
I am the original poster and am grateful for all the suggestions, expert advice, and links to...
By Jfuess on 21 September, 2014 - 10:38 am -
We are working on such a kit. Our preliminary designs have proved to work at 1.5 miles away with...
from the control department...4 wire vs. 3 wire RTD
What is the difference between 4 wire RTD and 3 wire RTD?
3 wire is more than adequate at that distance. your vendor can better inform you as it depends...
By san on 21 September, 2014 - 7:15 am -
For a 10m cable, which is the best options? 2 wire/3 Wire/4 wire RTD. I am going to test the...
from the Forum department...Sliding Mode Control - MATLAB
Need help simulating sliding mode controller using MATLAB/SIMULINK
from the Forum department...Mark V Diagnostic Alarms
Mark V TMR control panel, MS5001P, Diagnostic Alarms
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...
By visitor on 19 September, 2014 - 10:51 pm -
Often when cards are zapped by stray voltages, the isolation circuits (caps) can hold charge that...
By CuriousOne on 19 September, 2014 - 9:49 pm -
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...
from the networking department...Information regarding tag in Control logix over Ethernet/IP
Are controller tag details for control logix is available on ethernet/IP? Using 1756-EN2T module in controller chassis for communication.
By Ikhtiander on 21 September, 2014 - 3:44 am -
Psahu, It is depend on what third party devices you would like to connect. Can you be more...
By Bob Peterson on 20 September, 2014 - 9:48 am -
The Ethernet/IP protocal is well defined in the spec for it. Best bet is to either buy the spec and...
from the Software department...Using MODBUS in Visual Basic 6
Visual Basic 6 sp 6
Ethernet Communication Port 502
Visual Basic 6 sp 6
Ethernet Communication Port 502
By china taiwan on 20 September, 2014 - 6:04 am -
my name is James Lin ...... my email " email@example.com " ...
from the R & D department...Enable Register Read in LabView
When reading registers in MODBUS using LabViewm, how do I read data from registers at addresses 43XXX?
from the Modbus department...Non-Isolated and Isolated Modbus Slaves on Bus
Bus contains isolated and non-isolated slaves. Considerations when connecting everything together?
from the Simulation department...Automatic Volage Regulation
Question on the behavior of AVR after synchronization.
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...
from the Forum department...Power Meter Destroys Modbus RTU Bus Communication?
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.
> 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...
from the Forum department...WDFP QLC Card Download
Problem downloading to QLC card with LC Loader
from the Forum department...Yokogawa DCS Analog Module AAI143
Difference between analog mA value and their correspondent raw value.
I checked the Tunning parameters and there is an error. Maybe is a good idea to do an offline...
from the Mechanical Engineering department...Frame 9e Bearing Drawings
Bearing #1 drawings for a GE Frame 9e are missing.
from the Forum department...DCS analog input problem
DCS Analog input signals didn't work with ADAM card
Mr. Fawzy, That's a very interesting observation. A common for all channels is what allows...
from the Instrument and Control department...Siemens S5 CPU 922 Run and Stop LED Do Not Turn ON
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.
By Bob Peterson on 17 September, 2014 - 5:26 pm -
We have started getting a fair number of service calls for S5 units. They are closing in on thirty...
from the ModbusTCP department...PROSOFT MVI56-MNET Slave Response Time
PROSOFT MVI56-MNET communication response time and performance
By Bob Peterson on 17 September, 2014 - 5:19 pm -
Hint - prosoft has very good tech support....
Mandrell: "You know what I think?"
Doctor: "Ah, ah that's a catch question. With a brain your size you
don't think, right?"
-- Dr. Who