Search results

The grid frequency in India is famous in the rest of the world for it's fluctuations. It is not representative of the rest of the world, and as such machines don't typically behave like they would in other parts of the world. Over- and under-frequency relays in India are not set to more typical...

If you're having problems with flame detection it's likely that something other than the style of flame detection is the real problem. Are you having problems detecting flame during firing? Or at other times? What kind of combustion system does the turbine have (conventional or Dry Low NOx)...

When you say they "fight" each other please explain what you mean. Is the load (MW) unstable or is the VAr meter unstable, or both? Also, when you tie these two generators together are they connected together before or after step-up transformers?

There are a lot of control system integrators that will configure a PLC (Programmable Logic Control) system for use as a turbine control system. While PLCs are excellent for the majority of gas turbine control functions (turning on pumps and fans and energizing solenoids and annunciating...

First, it's not very common for the grid frequency to be so high in most parts of the world, but if it were high <b>and</b> the governing function of the DCS <b>did</b> switch to Isoch control then I would expect the load to drop very quickly as Isoch is PI control, usually heavy on the I...

hartanto, Here's an interesting video: This might be possible but it wouldn't be very easy. You would have to install the software on a MS-Windows PC, then format the USB drive, then use it on the <I>. As long as there are no drivers required on the PC using the drive, it should work...

I have seen this kind of problem occur when there is a discrepancy between the information that has been downloaded to the Mark V and that in the operator interface. One has to remember that when changes are made to sequencing (CSP) and signal names, etc., they are done on the operator...

kapil, From your description of the load reducing and the load control and speed control outputs reducing it is exactly what would happen if someone initiated a STOP while on load. A STOP from rated output will reduce the load/speed control which will reduce the power being produced by the...

We don't have enough information about your plant and how it is configured, programmed and designed to operate. What is clear is that someone doesn't understand how a power plant can "come on the home load" when it's being shut down while connected to a grid. From your description it seems...

What kind of control system are you referring to, and what kind of servo device are you referring to? The definition of a motor is any device that converts energy of any kind into mechanical energy. There are servo motors (which convert electrical energy into rotational force). These are...

Okay; this looks vaguely like a Rainbow Book-type question. It's certainly a poorly-worded question. Probably written by someone charged with writing a test who knew little about the subject matter of the exam and was reading a poorly-written textbook or reference. By process of elimination...

The pulsing consists of energizing a solenoid for some period of time. Some controllers provide for an adjustable pulse length (meaning that the length the solenoid(s) are energized is adjustable); some do not. Making the pulse length too long didn't seem to make cleaning more effective, in...

The Air Processing Unit just dries, cools and regulates the pressure the air which is extracted from the axial compressor discharge before it is used for pulsing of the filters during cleaning. The cleaning cycle is initiated (automatically) by actuation of a differential-pressure switch...

Thanks for the feedback! "Feedback is the most important contribution!"(c) here at control.com. Don't forget to make those images for future recovery needs!!!!

Gary C, Question 1: What is unstable? The load or the voltage? Question 2: Is the generator being operated in parallel with other generators or is it operating independently of other generators in Isochronous control mode? You haven't supplied us with enough information to be of help.

ProcessValue, Can you explain specifically your section on null bias current? I'm not sure what the intent is nor how to accomplish what is to be done.

No; it doesn't. The Mark V is not the most user-friendly or intuitive control system ever invented. (That can be said of most control systems that are designed by engineers who give little thought to how other people think and make associations. And since most control systems are designed by...

Sometimes, the cable ends are not very well made. There is supposed to be a small "pin" that almost looks like a nail that goes through the insulator and makes contact with the cable's conductor. Sometimes that contact is very poor, and sometimes the "pin"/nail falls out or gets lost when the...

controm, Without being able to review the application code and I/O configuration of the Mark VIe at your site, it's very difficult for us to comment on what could be causing your problem. When did this problem begin? After a maintenance outage? After a heavy rain storm? Has it been...

It is <b>NOT</b> possible to force analog values with the Mark V. The scaling for analog inputs is done in the I/O Configurator. You can open the I/O Configurator from the opening display you can click on 'List Screens', then 'Exit'. 'List Screens' will create an ASCII text file, IO_CFG.LST...