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  1. H

    Does sine filter needs a minimum current to work properly?

    hi All Can you please help me to understand if the sine filter requires a minimum current to work properly and create sine like signal ? If yes how to determine this current as it does not seem to be listed in the data sheets. Would it make a difference if the sine filter is standard type or...
  2. H

    what bandwidth is needed for spectrum analyzers for automation control panel?

    hi thanks for sharing that, could it help in emc panel troubleshooting ?
  3. H

    what bandwidth is needed for spectrum analyzers for automation control panel?

    hi i would like to troubleshoot emc problems in automation control panels and check levels of emc inside the panel after manufacture before shipping
  4. H

    what bandwidth is needed for spectrum analyzers for automation control panel?

    As we know control panels have low base frequencies 50/60 and 50th harmonics is only 2.5kz. All affordable spectrum analysers like rigol 815 tg have bandwidth from 9khz so does it mean they are not useful for FFT analysis of the EMC issues in the control panel? What gear do you use ? What near...
  5. H

    Control Technique serial cable cost around 200 pounds - is it possible to build your own?

    wow well impressed by these details, i will try it out and let you know how it went, thanks a lot
  6. H

    Control Technique serial cable cost around 200 pounds - is it possible to build your own?

    is it possible that there is some not disclosed trick in the comms which would make creating that cable impossible? so on top of careful wiring some analysis using wire shark will be required? I am asking only for opinion. Many thanks
  7. H

    Control Technique serial cable cost around 200 pounds - is it possible to build your own?

    hi All Just wondering if i used good quality generic serial cable why would i not be able to connect to the Control Technique drive eg. Mentor? is there some sort of hacking required rather than studing manuals from the drive manufacturer about the pinout, protocol and speed? I feel like i might...
  8. H

    Are macbook pro used in automation industry ?

    what would actually be the issue if the ARM processor is used? is it not a driving horse for the windows? I am sure i am lacking some fundamentals so please kindly elaborate if you can
  9. H

    Siemens G120 drive how to check analogue output

    thanks for your kind and very practical advice. Can you please help me with the remaining questions: 1: If the AO is in the current mode does it mean that the resistance of the field must be exactly 250 Ohms? What if it mismatches by a lot or is near 0. 2: Is that possible that the field wiring...
  10. H

    Siemens G120 drive how to check analogue output

    hi All Can you please kindly advise how to check analogue output if its working in 4-20mA mode? my idea is to connect 250 ohm resistor to the AO output, set drive to hand, disconnect motor, set ref to 100 percent and check if the voltage at full 20 mA is 5 V. Is that correct? Any other ideas...
  11. H

    Modbus RTU 4 or 2 Wire RS485

    thanks for reply it makes sense that device should be capable of ignoring its own traffic are there any reasons why in practice troubleshooting 4 wire modbus would be easier? what tools would you use - for ascii it would be putty client but what about rtu which is binary format?
  12. H

    Modbus RTU 4 or 2 Wire RS485

    interesting reply - any chance you provide more details on benefits of 4 wire- if slaves can hear other slaves what us the issue with that? they all have different addresses but maybe it makes comms faster because slaves dont need to processs other slaves traffic?
  13. H

    Modbus RTU 4 or 2 Wire RS485

    interesting reply can you provide more info please how do you tune echo? do you use osciloscope?
  14. H

    RS485 Troubleshooting

    So, you need three wires. Two for the differential voltage with the appropiate termination. A third one for the ground, which can be implemented connecting each devices digital ground with a "ground bus" through a 100 Ohm resistor. Also I have seen some application notes that suggest to use...
  15. H

    Are macbook pro used in automation industry ?

    so it runs ARM version of windows? never heard of that - i guess it will not work with automation very well
  16. H

    What device shall i use to measure 400V Voltage which can change frequency between 10-200hz?

  17. H

    What device shall i use to measure 400V Voltage which can change frequency between 10-200hz?

    massive thanks for reply - can you explain bit more more what labjack does - is it hardware, software or both?
  18. H

    What device shall i use to measure 400V Voltage which can change frequency between 10-200hz?

    i need to measure true RMS voltage (400V max line to line), current in each phase, power factor and total active power the challenge seems to be the wide range of the frequencies in which the measurment is taken, the measurement can be taken every 1s or 2s or more often if possible
  19. H

    What device shall i use to measure 400V Voltage which can change frequency between 10-200hz?

    hi i need line to line voltage and currents in each phase plus power factor plus total active power. Data to be sent over modbus tcp to the plc
  20. H

    What device shall i use to measure 400V Voltage which can change frequency between 10-200hz?

    thanks a lot for giving me direction i am on the phone to them right now
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