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The threads that wouldn't die...
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
Fortune
In seeking the unattainable, simplicity only gets in the way.
-- Epigrams in Programming, ACM SIGPLAN Sept. 1982
-- Epigrams in Programming, ACM SIGPLAN Sept. 1982
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Posts from...
Friday, September 19, 2008
Fr. 9E GE gas turbine main hydraulic oil discharge pressure get change suddenly without leakage and any other reason.
Trying to learn Modbus from ground up. Looking for good, understandable resources.
New Replies:
By Mark on 19 September, 2008 - 11:58 pm -
By Mark on 19 September, 2008 - 11:58 pm -
You should find this page helpful:
http://www.simplymodbus.ca/FAQ.htm...
I want to learn Binary code...
New Replies:
By Andy R on 19 September, 2008 - 11:46 pm -
By Andy R on 19 September, 2008 - 11:46 pm -
Binary is EASY. VERY easy. It's just getting the hang of it, that's all.
Okay, let's take 111...
cannot establish communication between a PC connected and PLC linked through a RS232 port after downloading the program.
New Replies:
By Roy Matson on 19 September, 2008 - 11:46 pm -
By Roy Matson on 19 September, 2008 - 11:46 pm -
Hi,
Why not just change the connector on the cable you have to suit your laptop? Are you also...
An exhaust diffuser converts velocity of flue gases into static pressure so that flue gases coming out at high velocity of a GT exhaust do not damage HRSG components?
What difference can it make if I connect a transformer primary with two phases from a three phase supply?
New Replies:
By Roy Matson on 19 September, 2008 - 11:41 pm -
By Roy Matson on 19 September, 2008 - 11:41 pm -
Yes, it's OK to connect between two phases provided you protect both primaries with a fuse or 2...
How to calibrate SITRANS pressure transmitter?
New Replies:
By Bob Peterson on 19 September, 2008 - 11:40 pm -
By Bob Peterson on 19 September, 2008 - 11:40 pm -
Pretty much the same way you calibrate smart ones except you have to adjust the span and zero with...
Maximum length of RS 485 cable between 2 devices
New Replies:
By Roy Matson on 19 September, 2008 - 11:37 pm -
By Roy Matson on 19 September, 2008 - 11:37 pm -
I see several posters give 1200 meters. I am not disputing that, but is it really practical?
I...
By Issac Issachar on 19 September, 2008 - 1:48 am - "No maximum bus length is given for RS485, but ends up around 1200 meters at 200kbps or 50...
By VAM on 19 September, 2008 - 1:35 am - The longest distance supported by the serial communications is 100ft, normally that value applies...
By Patrick on 19 September, 2008 - 1:12 am - Hi there,
The cable length is depended on what baud rate that is used. For more info:
...
By Tom Chubb on 19 September, 2008 - 1:08 am - It's dependent on the speed.
Can't remember off the top of my head....
By Raju D.S on 19 September, 2008 - 1:06 am - By using RS-485, a maximum of 32 devices can be connected in daisy chain network. And the maximum...
Communications issue
New Replies:
By Bob Peterson on 19 September, 2008 - 11:36 pm -
By Bob Peterson on 19 September, 2008 - 11:36 pm -
You can't, but AB has several options to do this. They aren't free but are not real pricey either....
Could anyone please explain the actual requirement of Extension Neck in RTD sensors?
I am investigating the need for remote control products within automation.
New Replies:
By CAC on 19 September, 2008 - 11:32 pm -
By CAC on 19 September, 2008 - 11:32 pm -
Hi, and thank you for your input.
Your suggestions are very valuable to me, so this is great....
Cross current in synchronized generators neutral cable
New Replies:
By blackstoneboy on 19 September, 2008 - 11:31 pm -
By blackstoneboy on 19 September, 2008 - 11:31 pm -
Do you mean the gensets are loaded?...
By blackstoneboy on 19 September, 2008 - 2:04 am - Hi there..
What is the rated power of your generators?? Try to lower the droop from the AVR to...
Why there is no exhaust (duct) back pressure high protection for Frame9E GT (MarkIV control in my case)?
New Replies:
By speedtronic on 19 September, 2008 - 11:28 pm -
By speedtronic on 19 September, 2008 - 11:28 pm -
Thanks CSA for your answer.
I have mentioned in my previous post that all our GTs run in...
By CSA on 19 September, 2008 - 2:04 am - Different packagers of GE-design heavy duty gas turbines had different philosophies regarding unit...
With reference to GE frame9E GT Excitation system(rotaduct/rotating diodes), why DC excitation voltage is not directly applied to rotor?
New Replies:
By blackstoneboy on 19 September, 2008 - 11:24 pm -
By blackstoneboy on 19 September, 2008 - 11:24 pm -
We cannot apply DC voltage directly to it since it is rotating....
Consider pros and cons of PCS7 as DCS for power plants.
New Replies:
By josef on 19 September, 2008 - 11:24 pm -
By josef on 19 September, 2008 - 11:24 pm -
Comparable to the CEMAT or BRAUMAT library is the PPL (Premium Plant Library) for PCS7. This...
DLN1 Tuning
New Replies:
By CSA on 19 September, 2008 - 2:12 am -
By CSA on 19 September, 2008 - 2:12 am -
One needs to be very careful when changing splits; very careful. And, this condition is also...
Have a waterfall churning out 12KW from an induction generator. My local utility gave me a new electronic meter that records the absolute kWh. So now when I send them excess power they charge me for the privilege! My old spinning disk meter was more fair even with an anti reverse ratchet!
New Replies:
By blackstoneboy on 19 September, 2008 - 2:12 am -
By blackstoneboy on 19 September, 2008 - 2:12 am -
Try to check power factor of your system. If the PF goes capacitive, definitely you will have...
from the electrical department...
Terminal (load) voltage changes in single alternator due to change in driving torqueEffect of varying the driving torque of single alternator on load voltage (load connected is purely RESISTIVE).
New Replies:
By blackstoneboy on 19 September, 2008 - 2:07 am -
By blackstoneboy on 19 September, 2008 - 2:07 am -
Hi...
As we always observed, the frequency is directly proportional to the voltage. If we vary...
I have a question about unequal load sharing of generators.
New Replies:
By blackstoneboy on 19 September, 2008 - 2:01 am -
By blackstoneboy on 19 September, 2008 - 2:01 am -
Hi Nimra.
What is the controller you are using when you do paralleling?? You should have master...
Output reduced 10% with fogging. What can be the possible reason?
New Replies:
By CSA on 19 September, 2008 - 1:52 am -
By CSA on 19 September, 2008 - 1:52 am -
This question has been asked before; see this thread...
The role of control systems engineering
New Replies:
By Curt Wuollet on 19 September, 2008 - 1:51 am -
By Curt Wuollet on 19 September, 2008 - 1:51 am -
As long as you have a loop a Bode plot applies. As long as you sample, Nyquist applies. Automatic...
By CTTech on 19 September, 2008 - 1:47 am - It seems that you have already formed an opinion. In the old analog control systems, you may be...
Looking for options for hardware/software that interface Fieldbus sensors to a Windows/Linux PC or a SBC running an RTOS.
We are facing a problem of Mark V controllers <R>, <S>, <T> whenever lightening strikes near by electrical switch yard.
New Replies:
By CTTech on 19 September, 2008 - 1:43 am -
By CTTech on 19 September, 2008 - 1:43 am -
This is what I find interesting. C core is not part of the power loss. Although, ALL cores are fed...
By Tushar on 19 September, 2008 - 1:32 am - I think processor's (R, S, T) toggle switches in <PD> core are not grounded. Please check the...
Upgrade of AB Process Portal A
New Replies:
By Rob on 19 September, 2008 - 1:40 am -
By Rob on 19 September, 2008 - 1:40 am -
The answer to both your questions is of course Yes. You can upgrade any version of PPA and the...
I would like to know how to use LCC/DCC keypad.
A request for information about Modbus RTU
New Replies:
By Nick Jacobi on 19 September, 2008 - 1:37 am -
By Nick Jacobi on 19 September, 2008 - 1:37 am -
Thanks everybody for the replies, this should be more than enough information to go on. If there's...
I am trying to simulate a regenerative power supply using Simplorer.
Mark V HMI upgrade possibility?
New Replies:
By CSA on 19 September, 2008 - 1:32 am -
By CSA on 19 September, 2008 - 1:32 am -
dinster,
I think you have two options: Buy a new HMI from GE, or buy one of the third-party...
How do I calculate the average value of the wind direction when 0° and 360° are the same?
New Replies:
By Robert Scott on 19 September, 2008 - 1:14 am -
By Robert Scott on 19 September, 2008 - 1:14 am -
Rik,
I tried some examples using your eigen-vector method and using the method I proposed:
...
Oscillations in control system.
New Replies:
By Hans H. Eder on 19 September, 2008 - 1:10 am -
By Hans H. Eder on 19 September, 2008 - 1:10 am -
Integral time still seems very low to me (of course, without having seen your response curves)....
What is PI thread in DeltaV
New Replies:
By Graham Burnikell on 19 September, 2008 - 1:08 am -
By Graham Burnikell on 19 September, 2008 - 1:08 am -
PI is a propriety Data Historian from the Vendor OSISoft (http://www.osisoft.com). It has been used...
Flow measurements are not constant in the C2H2 pipeline.
New Replies:
By Rohit Chandak on 19 September, 2008 - 1:04 am -
By Rohit Chandak on 19 September, 2008 - 1:04 am -
There are few technologies that can handle this application with perfection. VERABAR Flow Element,...
Empty summary
New Replies:
By Joern on 19 September, 2008 - 1:04 am -
By Joern on 19 September, 2008 - 1:04 am -
Fanuc's Ethernet based protocol is called Focas. As far as I know, there is no OPC server...
Having problem in PLC giving CPU error.
New Replies:
By zahid on 19 September, 2008 - 1:01 am -
By zahid on 19 September, 2008 - 1:01 am -
Replace the battery and reprogram the CPU.
...
Can I measure steam flow using smart ld301 tramsmitter?
Installation of Positive type Flow-Meter
New Replies:
By Rohit Chandak on 19 September, 2008 - 1:00 am -
By Rohit Chandak on 19 September, 2008 - 1:00 am -
Let me have your details to send installation manual on our PD Meter device which should help you....
Does anyone know of a manufacturer for V-cone flowmeters?
New Replies:
By Rohit Chandak on 19 September, 2008 - 12:59 am -
By Rohit Chandak on 19 September, 2008 - 12:59 am -
There are few companies in China & Hitrol (I think I spelled it correctly) in South Korea which...
Compressor bleed valve problems in power plant.
New Replies:
By Ero on 19 September, 2008 - 12:57 am -
By Ero on 19 September, 2008 - 12:57 am -
Hi,
We had some problem with CDP bleed valve last time. I checked servo controller and again...
About encoder in brushless motor
New Replies:
By Fabri on 19 September, 2008 - 12:56 am -
By Fabri on 19 September, 2008 - 12:56 am -
>Are you talking about phasing the motor
>to find commutation? <
I don't know. The...
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