Hi all

We have mark VI and we get a problem with the collection of DDR.
DDR are configured in the controller and I verified during the trigger under the DDR menu that the controller is getting data. But when collecting is done I can't find the data collected in the disk. I think there is a problem with the configuration of the HMI to get the data from the controller.

Could you help please

 

Problem resolved

In fact the historian wasn't configured to collect the DDR from the controller

To resolve such problem these are the steps:
-open the data historian config *.reb
-add new collection;select controller capture buffer
-add the DDR to the collection
-get signal from database
-validate,build,download

the job is done and the DDR will be saved under historian data directory.

 

Nice job Amosiss, glad you were able to resolve your problem. And thank you also for the feedback that will hopefully help someone in the future.

 

You are welcome MIKEVI.

I need some help with fuel servo current.

The problem is that at stand still the "FQROUTTV1" bloc compare the "FAL" to 27% constant and if FAL<27% the L3LFLT (liquid fuel control fault) output is active which inhibit the starting of the machine or during start up causes a pre-ignition trip.

 

Dear Amosiss,

this may be a difficult one to help with. It would help if we knew what model of machine you are talking about, what control system is in use, and what type of liquid fuel control valve is in use. Does your system have a liquid fuel bypass valve that has an LVDT for position feedback?

The fault you speak of has to do typically with an incorrect current feedback from the liquid fuel bypass valve servo. This could be caused by a problem with the wiring or servo valve.

Please let us know what you have done to try and diagnose the issue and we can possibly try to help further.

Also just as a suggestion it is usually better to start a new "thread" when changing topics like this. That way when someone does a search years from now for a liquid fuel problem they will hopefully find our discussion. Using your old thread about the DDR problem makes it more difficult to search later on.

Just a suggestion.

 

MIKEVI,

Have a look at this thread:

http://www.control.com/thread/1389348883

By copy to Amosiss, this topic has been covered before on control.com. As has been written before, the Control Constant current value is not a "cast in stone" value but rather a "sanity check" to make sure the Speedtronic isn't putting out current which would cause fuel to flow immediately upon starting.

It's very common for this condition to be very close to the alarm condition during commissioning and then over time (as resistances change with component age and temperature) for nuisance and intermittent problems such as you are describing to start occurring.

It's acceptable to decrease the Control Constant value by a small amount, but if the problem persists (the alarms start occurring after some time) then a larger and more serious problem is indicated and needs to be investigated and resolved. It's NOT acceptable to keep decreasing the Control Constant just to stop the alarms because at some point the problem is going to be a lot more serious than a nuisance alarm.

control.com has a very good 'Search' feature, though it's cleverly hidden at the far right edge of the Menu bar at the top of every control.com page. (Syntax is important, so it's recommended to read the Search Help before using the feature for the best results.)

As with any Search function, if at first you don't succeed--try, try again. Use different terms and words; try enclosing multiple words in double quotation marks. Read some of the seemingly irrelevant Search results to see if there are other words/terms you might use in subsequent searches. Searching, while not an art, does require patience and some knowledge of how search engines, in general, and particular search engines, sometimes, work. The good news is: many search engines use similar syntax and conventions, so what you learn here will translate into better Web searches in the future!

Please write back to let us know how you fare (on the other thread, though, please!)! As MIKEVI suggested, it's always better to start a new thread (or use a similar thread) for help with a "new" problem. (Makes 'Search'ing easier!)