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Contact Siemens England: https://www.siemens.co.uk/en/about_us/index/manufacturing/industrial-turbomachinery.htm They may / may not give you technical information but do sell spares. Forget EGT just mention Tempest, STAR controller and CT94307/01.

>True if the relay's coil is the only load. But if there is >any other load on the relay, I think the contacts would melt >and weld before the coil burns out... Ah Yes! That reminds me being on site many years ago.... a contactor was connected to a 37KW motor. On switch on it chattered...

Sounds to me as though you would want a frequency multiplier not frequency divider. A divide by ten logic module could be designed mindful this would give a pulsed output. You need to ask why your controller 'needs' 3800Hz and is there a workaround.

You will have re-invented the buzzer. Do it with an old GPO (post Office) relay (24vDC) - then touch the terminals to get a hefty belt from back emf's!

You haven't stated what your industrial network is, but one would guess the industrial network route is the 1st link and modbus is the slower (secondary) backup.

Having worked in the Chemical Industry for a short time, we found it unusual for the Control Systems Engineer to spec/purchase valves. And where did he obtain the relevant information from ? - from the process engineer who knew what he wanted ! As for critical pressure differential ratio, try...

TIA (Totally Integrated Automation) portal is not Siemens PLC but software package for Siemens PLC, HMI & drives. "TIA Portal is a new concept of integrated project configuration. As a uniform engineering platform, it is for programming and configuring the control, visualization systems and...

If you're a starter: If you're really into it - the manual: http://home.hit.no/~mortenp/A289/Manualer/Simatic/Confb3v5_e.pdf

This is covered by Page 53 of the Manual: https://www.geoilandgas.com/sites/geog.dev.local/files/mn-12400-dlt-iom-gea19367a-english.pdf

If you mean MTL type TP48? these are intended for use out in the field usually to protect instrumentation exposed to possible storm conditions. I suppose you could test with a Megger or insulation testing device but unsure what this would achieve.

From what you have described, if the gas supply drops rapidly in pressure intermittently and for no obvious reason then I would expect the turbine to firstly to compensate by opening the throttle then detect 'flameout' when that doesn't maintain performance. Nothing strange about that. I...

I would assume your SCADA system can access at least one word in a data table. You haven't stated which Siemens PLC but in ladder format it could be one rung for each alarm bit. the equivalent to get/put statements, one for each bit. The same idea applies to any other PLC not just Siemens.

You've been thermocouple swapping?! The symptoms suggest burner failure although you haven't indicated loading at trip point. If you have cleaned the offending burner, try a direct replacement. It is generally easier to start on gas rather than liquid fuel. Why will it not start on gas?

Unsure what you mean by '.. back-calculate turbine combustion temperature ..'. I understand working temperature is measured by several probes at the burners. What does the HMI screens show?

A PLC fault condition would give you at least a green LED changing to red on the output module(s) apparently at fault. From your description however, it appears as though it has been designed to de-energise PLC outputs. The only obvious reason to do this is for Emergency Stop/Fail Safe...

The answer is a definite maybe! There is apparently no Code of Practice for specific Ex na lower power devices. It was a few years ago one end user asked for proof that an IS barrier was in fact intrinsically safe. It was a case of - simply go back to basics. In your case - closely...

You have to give a little more detail such as: - has this communication link ever worked - what is the Configuration at either end - which is master and which is slave (Isn't the DCS sending data to the offsite PLC, not the other way round).

It's a long time since seeing a S5 setup. From what I recall there is no master/slave scenario. Whichever CPU came online first made the other the backup. Also the I/O addressing was numerical depending where the cards were in the rack. It's unclear what FUM you mean unless it's a 'FUM'...

Anyone who codes PLC software will/should have a least one backup of it. If a machine has been stored and the Software is not stored in non-volatile memory (in battery backup memory), then it is quite possible the battery has been disconnected or discharged sufficiently to lose memory content...

This appears to be a point for a Process Engineer to deal with. A great deal depends on the physical properties of the material, but would have thought pneumatic solution was the way - Suction to hold and pulsed air jets for label separation. Counting labels is the easy part probably using...