M.E.A. Incorporated introduces a digital interface that controls FCCU (Fluid Catalytic Cracking Unit) Slide Valve Actuator (including Plug, Butterfly or other valve actuator) movements accurately based on a 4-20mA Control signal (or digital signal) and the actual position transmitted by a digital transducer.
The digital controller and transducer are offered with redundancy. In the event of a digital component failure of the primary system, the system will switch automatically to the secondary or redundant system.
Result: 100% reliability.
The controller may also be mounted or controlled via serial communication such as Ethernet or other communication protocol. Integral parts of the system are the following screens:
Valve Footprint Screen
A footprint is taken of the valve actuator at the valve manufacturer's facility to serve as a baseline. Another valve footprint is taken after installation but before start-up (nearly one-third of installations are done incorrectly due to stress on valves). Still another footprint is taken at the beginning of the operation. This is the all-important baseline against which all future baselines will be measured. Baseline trends, when compared to test trend, will show if the valve is beginning to fail in time to take preventative action.
Options
A strain gauge can be supplied on the valve packing. A trend can be seen and will recognize the packing failure. Also, a flow transducer may be integrated to measure the air or nitrogen used for packing purge. A thermal couple is mounted on the valve to measure temperature. This is on the external walls and indicates if a hot spot occurs. All of the above are shown as a trend. A gradual trend indicates a potential failure is going to happen in the near future. A sudden change in the data means the possibility of something failing in the process line and jamming the valve or the valve stem is damaged. Knowing the time of the event and break makes it easier to identify the problem.
540 Series Digital Controller Main Screen Description
The main screen is the default screen during power-up. On this screen the user will be able to access all other screens. This screen features two large dedicated displays. The position display will always indicate valve positions as a percentage, 100% being fully open. The other dedicated display is deviation. Deviation is the percentage of error between command signal and actual position. Under normal conditions this displays reads 0%.
There is an indicator next to alarms to indicate status. A green lamp indicates that the alarm is normal. A red lamp indicates that there is a fault.
Other 540 Series Digital Controller Screens:
Typical Specifications:
|
CPU |
Embedded 300 MHz Geode CXI |
|
DRAM |
64 MB standard |
|
Removable Compact Flash |
32 MB Standard up to 1GB optional |
|
BB RAM |
128 KB standard |
|
Ethernet Port |
10/100baseT (RJ45) |
|
Ethernet I/O Modules (optional) |
Digital I/O, Analog I/O, Counter, 4 axis servo/stepper |
|
PC104 Expansion (1 slot standard, 3 slot optional) |
Additional Serial Ports, Motion Control, Servo, Stepper |
|
Serial Ports |
Com1 RS232: 9 pin D-connector, Com2 RS232: 9 pin D-connector, Com3 RS422/485: Screw Terminal |
|
Keyboard Port |
PS-2 keyboard connector standard |
|
Programming Port |
RS32, 9 pin D-connector (Ethernet port also available for downloads and programming) |
|
USB Port |
2 ports |
|
Front Bezel |
Aluminum front panel bezel. Stainless Steel optional |
|
Housing |
Rear housing is constructed of formed, plated steel |
|
Display |
8.4" SVGA TFT (800x600 high color, 300 units) |
|
Touch Screen |
Full analog resistive touch screen |
|
Power |
18 - 30 VDC, 20W |
|
Environment |
0 to 50 C - Operating -20 to +60 C -Storage 5% to 95% RH, non-condensing. |
|
Weight |
6.1 lb. (2.8 kg) |