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Control.com topic...
Engineering
Topic: Engineering and workplace issues.
from the Control department...
Control Signal Segregation
Originally posted by Farag on 1 December, 2012 - 6:05 am
Segregation between input and output control signals
New Replies:
Thanks for your reply...
> I have no reason to do so even my consultant insist for me to > apply his idea to...
Topic: Information resources, documentation.
from the Automation List department...
Oxidation of Relay Contacts
Originally posted by Mark Riche on 12 July, 2000 - 12:51 pm
What is Oxidation of relay contacts and what can be done to prevent it ??
New Replies:
I guess this is an old post but I'll throw in my 2 cents worth anyway. We had similar problems with...
> What is Oxidation of relay contacts and what can be done to prevent it ?? For both relay...
Topic: Engineering and workplace issues.
from the Forum department...
Level measurement in crude oil caverns
Posted by Espen T. Nordsveen on 5 December, 2012 - 8:07 am
How to measure oil level in underground caverns?
Topic: Engineering and workplace issues.
from the ELECTRICAL ENGINEER department...
Negative Sequence Current Settings
Posted by MUHAMMAD KASHIF IDREES on 5 December, 2012 - 3:50 am
Configuration of Negative Sequence Setting in Siemens SIPROTEC 7SJ622
Topic: Power generation equipment control.
from the Forum department...
Load Gear Oil Leakage GE 6B Gas Turbine
Originally posted by EserBp on 1 December, 2012 - 1:56 am
We had a Leak problem on Load Gear Reducer of Gas Turbine 6B GE supplied.
New Replies:
Mr. Johnston; is has not suddenly happened, from the beginning we have this problem. we also...
Dear CSA, thank you for reply; because of that fact we directly measure vacuum from the gear...
Just had the same problem on four Frame 6 with new Flender horizontal box. Firstly we increased the...
EserBP, The fact that you can decrease the severity of the oil leak by increasing the vacuum on...
Dear MIKEVI; at first i would like to thank you for your reply. it is true that we have mist...
Dear EserBP, I am not very familiar with the 6B units but will offer these suggestions and...
Originally posted by Chandru on 4 December, 2012 - 8:30 am
Reason for looping input connections of circuit breaker
New Replies:
Often poles in series is done with a DC load, because it's harder to break (no zero crossing), and...
Topic: Power generation equipment control.
from the Mechanical department...
calculating the time required for safety valve
Posted by Any on 4 December, 2012 - 10:31 am
How to calculate the time required for safety valve floating in coal fired boiler in case of turbine tripping/bypassing?
Topic: Engineering and workplace issues.
from the Wiring Standard department...
Wire naming standards
Originally posted by DJK on 1 December, 2012 - 10:36 am
Same wire two wire numbers in two panels
New Replies:
Thank you both for the replies. I'll put wire naming convention in the specification next time for...
The point is that if you leave it up to someone else they will follow whatever practice they choose...
Bob Peterson, In the case of your 13-character wire number there was a specification provided...
There are many conventions out there. Some people start over again and reuse wire numbers for every...
Seems like the panel builder just made two "identical" panels--especially since there was...
The panel builder had corrected the naming problem. As for the spec. there was no where mentioned...
How did you make your panel-builder aware the two (2) panels would be powered by the same source?...
Topic: Engineering and workplace issues.
from the Instrumentation department...
Exi junction box
Originally posted by Bhupender on 30 November, 2012 - 6:24 am
What is the difference between a Exi junction box and a IP67 junction box of same material?
New Replies:
Pl. read some basic literature to understand the concept of Exi (Intrinsic Safety) and various...
You could use any junction box you like in an Intrinsically Safe loop [Ex(i)] as no certification...
I believe ATEX uses Exi levels for explosion proof certification and IP67 is just for weather...
Topic: Sensor technologies.
from the flow control department...
flow splitter for coriolis flow meter
Originally posted by Kirill St. on 26 November, 2012 - 4:34 am
Why do some companies use the double tube concept in the coriolis meter construction and almost no company that produce single tube coriolis flow meter?
New Replies:
Thank you for the answer...
In the beginning there was the MicroMotion single "U" shaped tube. This vibrated at...
Topic: Engineering and workplace issues.
from the Control system department...
Experion Server Failure
Originally posted by Kamran on 20 July, 2012 - 1:35 am
Experion Server Failure and Redundant did not take up the operation
New Replies:
Hii, I saw this post little late. Ask your Honeywell Engineer to do a TAC System Audit on all...
Originally posted by Hamed Jafari on 7 August, 2012 - 3:29 am
I want control rtu in modbus protocol via gprs internet
New Replies:
You can use our GT-541 to create a virtual com port connection to your Modbus RTU slaves through...
Topic: Engineering and workplace issues.
from the Automation List department...
EEx ia vs EEx [ia] vs [EEx ia]
Originally posted by Rashid on 19 November, 2012 - 10:32 am
EEx ia and EEx [ia] and [EEx ia] and isolation barrier
New Replies:
First, you need to read the certification documents and manufacturer's information to find out...
Topic: Engineering and workplace issues.
from the EE department...
120/208V or 277/480V.... huh?
Originally posted by Anonymous on 25 September, 2003 - 1:11 pm
what does it mean when something is rated 120/208V or 277/480V? What do the two numbers mean?
New Replies:
"You are correct ONLY if it is a pure resistive load... P = E * I and for this case you use...
> Excellent answer, if by "heater" you mean "motor". Actual...
Originally posted by arocon David on 25 October, 2012 - 4:22 pm
For measuring hydraulic pressure of a high pressure pump, what do i need to measure: absolute or gauge pressure?
New Replies:
Gauge pressure...
Depends on what you call high pressure. most commercial equipment (excavators, cranes, winches...
Topic: Engineering and workplace issues.
from the Instrimentation & Control department...
Compressor Anti surge control Algorithm
Originally posted by Ahmed on 27 July, 2010 - 5:57 pm
the closed loop anti surge control equation for the centrifugal compressor
New Replies:
Hi, For a typical surge controller you may use a PI controller (where 'D' is not applicable...
Topic: Engineering and workplace issues.
from the Forum department...
Measuring weight from Hydraulic Pressure
Originally posted by arocon on 16 November, 2012 - 2:48 am
I need to measure weight of the steel coil from the hydraulic pressure when lifted up
New Replies:
Depends how accurate you require to weigh, if for weights and measures, fit load cell and print out...
Topic: Application Questions and Problems
from the Forum department...
density and process measurement
Originally posted by aki_lala on 27 November, 2012 - 1:12 am
Does density affect process measurement? How?
New Replies:
> I am trying to do a final year project on density measurement equipment. But then, i was...
Topic: Engineering and workplace issues.
from the Automation List department...
Why is current transformer secondary short circuited?
Originally posted by Anonymous on 6 June, 2007 - 11:47 pm
Why is current transformer secondary short circuited during the operation?
New Replies:
> CT secondary will develop a very high voltage when secondary is open circuited with the...
Topic: Engineering and workplace issues.
from the Instrumentation department...
Confusion in defining calibration range
Originally posted by Gopi on 13 October, 2009 - 12:48 am
Confusion in defining calibration range
New Replies:
Hi Goppi, As far as I have worked and studied and learned from my seniors the difference between...
Topic: Engineering and workplace issues.
from the Gas Turbines department...
Firing temperature of Gas Turbine
Originally posted by QP on 11 August, 2007 - 12:58 pm
What the 'Firing Temperature'(TTRF1) a gas turbine indicates?
New Replies:
If an axial compressor experiences a stall condition, it's not very likely that it will keep...
Compressor rotating stall can affect both, CPD and exhaust temperature. CPD will decrease and...
Posted by Elliott on 27 November, 2012 - 9:58 am
Has anyone tried successfully in implementing a Profibus DP ring topology by alternating fiber to copper and back to fiber?
Topic: Engineering and workplace issues.
from the Automation List department...
Why 4-20 ma is used in Analog Signals?
Originally posted by sreeraj on 3 June, 2007 - 12:25 pm
Why 4-20 ma is used in Analog Signals?
New Replies:
> Why 4-20 ma is used in Analog Signals? > How come ISA selected this. Why not 5-21ma? ...
Topic: Power generation equipment control.
from the Forum department...
Connecting to GE EX2000 Exciter
Originally posted by KGE on 2 April, 2011 - 11:51 am
I wish to connect to a GE EX2000 exciter with Control Systems Tool Box 6 to troubleshoot the exciter.
New Replies:
Justin, Do you have information on which jumpers and how to put them? Best Regards, Jose...
Topic: Engineering and workplace issues.
from the engineering department...
EX2K connection and questions
Originally posted by jose on 21 November, 2012 - 4:02 pm
need help on EX2K
New Replies:
Dear Jose, sorry but I cannot send the manuals by email. On the Controls Connect site I just...
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