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Sounds like the noise or RF from the spindle power wiring is inducing noise and a false limit switch signal into that wiring. You will need to separate those different wiring runs or cables at a minimum. You may also have to shield the limit switch wiring by using shielded cable that has a...

Is the Fire Water pump logic PLC, electronic or relay? What is the pressure measurement? Pressure switch or transmitter? Possibly the FW pump controller saw a low pressure because the power surge or drop (?) affected the pressure measurement. What type of fail safe logic does the FW...

You need to get a current revision of your local boiler code or NFPA boiler code or CSA boiler code. This will provide the basic philosophy and requirements of a BMS.

If you look at the data sheet for a pump or compressor there will be a minimum suction pressure listed. This is the minimum inlet pressure required for the equipment to operate at it's rated flow or pressure increase; and for a pump not to cavitate.

> Can any body explain what is the difference between 1OO2D and 2OO2D? 1 out of 2 with diagnostics (1oo2D) means that the system votes 1 out of 2 with regards to inputs, processor and outputs and has build in diagnostics to improve safety and reliability. The diagnostics are required to give...

It is diameter of the port or seat. You will find trim that is the full diameter of the valve or a reduced port size. Check the Cv charts for globe valves. The Fisher Control Valve Handbook is a good reference: http://www.documentation.emersonprocess.com/groups/public/documents/book/cvh99.pdf

P&F has a very good web page; http://pepperl-fuchs.no/global/en/classid_1824.htm?view=productdetails&prodid=53654 Summary from the datasheet for the KFD2STC4-1 is; - 1-channel signal conditioner - 24 V DC supply (Power Rail) - Input 2-wire and 3-wire SMART transmitters and 2-wire SMART...

This AB manual shows that PLC5/10 and /15 are only DH+; http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1785-um001_-en-p.pdf You will need a serial to DH+ converter like the AB 1770-KF-2 or a USB to DH+ interface.

You need a better control scheme. Your pump loop should have: -an auto/man station for each VFD -a bias station to switch between pumps or have them share the load. A bias of B=0-100% applied to the first AM station as -B and the 2nd AM station as -(100-B) -a low output limit on the AM...

Means that it is certified for IS and flame-proof applications. Many field instruments are certified for general purpose, IS and flame-proof; therefore only 1 model # is required. There is no barrier included or required in the instrument. If you are going IS, a suitable barrier is...

What is the hold up time of the PLC power supply? Do the motor controls have any auto restart or re-acceleration logic? The issue with a PLC controlling a MCC is that relays can drop out when there is a power blip and re-energise immediately with power but a PLC may reset itself. Therefore...

Google "usb data acquisition" and you will find many options. Your choice will depend on number of channels and software features. These companies have daq starting at $100.-; http://www.dataq.com/data-acquisition/usb/ http://www.mccdaq.com/solutions/USB-Multifunction-DAQ.aspx

You need to understand process safety and functional safety. There are levels of safety: -design of process -pressure relief, piping design -process control -Safety Instrumented System Every system or level is designed to keep the process safe. A HAZOP will determine the risks in...

> Is there any website which gives the detailed definition/information on the TUV AK-6 > specification/certification. See page 13 for a comparison between SIL and AK safety levels; http://www.automation.siemens.com/w1/efiles/automation-technology/pi/SIL/SIL_Broschuere_en.pdf AK-6 would...

I would ensure that you have proper termination resistors; nominal value 120 ohms. And could also try idle state bias resistors at 1 terminating resistor, effectively pull up and pull down resistors. One from A line to Vs and one from B line to ground. Typical values from 1200 to 2100 ohms.

Interposing relays for 24VDC control of 120VAC or 125VDC are used everywhere. Wire type and insulation must exceed the working voltage. The different voltage levels must be separated and identified:\ -in different wireways -wiring on one side of relay will be 24VDC and the other side will be...

>Please can you assist me with the steps to use for taking >application backup of Honeywell Plantscape DCS R320 running >on Windows NT, and also How to restore the backup. You can backup the DCS project files by server by: -backing up the server EBR database files with Experion Backup...

I don't see a safety issue with 120 VAC motor control. You need qualified electricians to work on it; but the motor will be a higher voltage 600 V - 13.8 KV and will require qualified tradesmen. I can see stupid cheap people doing this so that they can hire less qualified cheaper labour...

Your wire run is 1000 ft and 18AWG has a resistance of 6.385m-ohms/ft; so wiring resistance of 6.4 ohms. There is a wide range of current draws out there depending on size, duty and contact rating of the relay. Weidmeuller and Pheonix TB interposing relays draw 11 mA @ 24VDC. An IDEC RH...

https://www.wired.com/2014/11/countdown-to-zero-day-stuxnet/ "Stuxnet 0.5 could spread only by infecting Step 7 project files—the files used to program Siemens PLCs. This version, however, could spread via USB flash drives using the Windows Autorun feature or through a victim’s...