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  1. josedavidch

    MACHINE COLOR CABLE CODE STANDARD

    Hello, I have been reading about color codes for machines control enclosure. I would like to get a better idea using a new post and getting as much info as possible. In the last 10 years, I have been using a color standard I learned since I start working on automation on my first employment...
  2. josedavidch

    LAND LINE TO VOIP

    Hello all, I have just recently moved to a new facility where there is no land line instalation on the different areas of offices. I am wondering if that worst to do the wiring to every spot I need an analog line or instead, invest in a wireless phone system where I can use the lines I own from...
  3. josedavidch

    Temperature Transmitter linearity

    Hi all, I have a PLC reading a thermocouple transmitter in the range of 4-20mA for a temperature range of 0°F to 500°F. After I calibrate zero and span to match 0°F = 4mA and 500°F = 20mA, I found that there is no linearity at all on such devices, drifting almost 8°F down on midscale when...
  4. josedavidch

    PID BLOCK sampling time on AB PLC

    Hi all, I have been dealing with an industrial oven, where the regular process temperature controller were replaced by a PLC in order to automate some other task. The problem is that my PLC does not have auto-tune like some other models and then, I am dealing to get the PID block tunned. So...
  5. josedavidch

    BEST THERMAL INSULATOR 700F

    Referencing thread391-99001: Has someone ever use MACOR from http://www.accuratus.com/macorfab.html ? I have a heat stake application where I need to reduce as possible heat transfer by direct contact. Attached the cross section of my assembly. Orange solid is where a band heater will be...
  6. josedavidch

    MEASURING 1inWC WITH SENSOR SWITCH

    HI, I am working on an application where Type X pressurization/purge is requiered to an enclosure where a AB 2711P HMI is installed. The custumer requieres to use 10-12 inWC pressure and then we set to measure this pressure with a presso-swtich AirLogic 4100-50. Happen that this HMI model...
  7. josedavidch

    AB POINT IO 1734 USED FOR LIMIT SWITCH XMIT

    Hi all.. I have an application where the actual handler moves a vertical system powered by a MP series motor from AB. Motors are driven by sercos Ultra 3000. PLC is a 1768-L43 with motion module SERCOS. Since the 3 stations are inside a medical explosion-risk (class1, div 1)room , the main...
  8. josedavidch

    PANEL VIEW 2711P ETHERNET

    Hi.. I have been trying to connect my 2711P Panel View Plus 1000 to my machine ethernet based on a 1768-L43 with 1768-ENBT ethernet. All other ethernet devices within the network works fine and I can see them on RSLINX, but this HMI and my laptop (XP SP2). Does anyone knows any known issue when...
  9. josedavidch

    MIXING PNEUMATIC AND ELECTRIC INSIDE ENCLOSURE

    Hi All.. Dealing right now with decision of a big control panel for PLC and servo drivers. Almost 50% of space will be available after installing electric control/power components and thinking in using the rest of space for installing some valves and tubing for a purge system of this equipment...
  10. josedavidch

    CONTROL IN CLASS I/DIV 2 ROOM

    Hi, I have an application where I need to control a simple application which needs to read from a bar code scanner and print a process ticket after every cycle. There are 14 stations for this with no more than3 inputs and 2 outputs per station. Every station should have an HMI and store data...
  11. josedavidch

    What is the best analog input? 1-5V or 4-20mA

    Hi I have been working several years in PLC programming, but only doing analog input application since last 3 months. I am wondering what is the best analog input to work with? 0-10V 1-5V 4-20mA Please advice based on experiences. Regards
  12. josedavidch

    ENGINE STARTER

    Hi Can someone advice where can I find the theory of operation of the starter? I am basically trying to figure the peak current usage looking for a way to increase my starter contacts life.
  13. josedavidch

    100 mA(AC) Current Sensing devices

    Hi I have been exploring many many sites looking for a low current sensing device capable to send 50mA to 500mA AC currents. I have tried some from www.crmagnetics.com but those are very suceptible to noise, and my circuit, having 20 lines carrying 100mA produces such level of noise that...
  14. josedavidch

    FUSE or CIRCUIT BREAKER FOR MOTOR PROTECTION ON SHORT CIRCUIT?

    Hi Power circuits uses short circuit protection. One can use different types of fuses (fast action, delay) or circuit breaker (fast action, inverse time). What kind of criteria should I consider to select one (fuse) or another).?
  15. josedavidch

    GAS DISCHARGE TUBES

    Hello Has someone seem on the market, equipment to fully teste Gas Discharge Tube? I have been working with them for the last 5 years, and every year I try to find a good brand or at least a brand that manufacture a suitable device for. The closest I got was with www.kukusui.com The offer IR...
  16. josedavidch

    DC TO AC FAST SWITCHING

    I have an application where I need to surge a gas discharge tube* (GDT) with high voltage DC current to set it in conductive mode (turn it on). As soon as the GDT is on, I need to fast switch to 120 VAC in less than 500µs (avoiding the GDT to go OFF state). What can be used to switch from DC to...
  17. josedavidch

    PLC (OMRON) Object Oriented Programming

    Has someone see something like graphical or object oriented programming for Omron PLCs? After several years of doing ladder programming I am getting bored and I think something better and faster should exist
  18. josedavidch

    POWER TRANSFORMER PEAK CURRENT

    I just installed a power transformer of 75KVA, 480VAC on primary and 1500VAC on secondary. We got surprised that this transformer triggers our 200A circuit breaker when energized with secondary open circuit (no load at secondary). Looking for the reason why, I figure out that when I energize...

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