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  1. Rodneywagr

    Testing of large capacitors

    Thanks for your help. The Sencore LC103 looks like the instrument for the job. For those interested in the method used to date, we wired a 40W, 110V lamp in series with the capacitor under test and a variac and isolation transformer/rectifier, and slowly increased the voltage across the...
  2. Rodneywagr

    48VDC PLCs

    In the installation, all the surrounding equipment works off 48VDC. The only power supply available is 48VDC. To use a standard 24V PLC will mean a DC-DC converter - another piece of equipment that can fail! Hence, if there are 48VDC PLCs available, the installation would be a little simpler...
  3. Rodneywagr

    Voltage Drop Calculation on 50HZ Systems

    Information on 50Hz voltage drop figures can be found at some of the Australian cable manufacturer's web sites. www.olexcables.com.au has a handbook which is downloadable in PDF format from their website. www.au.pirelli.com/uk/cables also lists volt drop figures. Australian Standard AS/NZS...
  4. Rodneywagr

    48VDC PLCs

    Does anybody make PLCs which operate from a power supply of 48V DC, and which have inputs which accept 48V DC signals??
  5. Rodneywagr

    Testing of large capacitors

    There are a number of large capacitors in power supply circuits on our trains. Typical sizes include 3300uF @ 350V; 1uF @ 660V, 10uF @ 800V. Does anybody have any recommendations for test equipment to check if capacitors are good, or starting to fail. A capacitance check on a multimeter will...
  6. Rodneywagr

    Lead Acid vs. Alkaline Acid Batteries

    My experience of NiCd batteries is that they are not good in situations where vibration can be experienced (as on railway vehicles), having a much shorter life than the 15 - 20 years promised by the manufacturers. They probably would last longer when used in a stationary situation. Used as...
  7. Rodneywagr

    Radiate & Induction Heating

    Radiant heating is subjecting an object to a source of heat such that the heat radiates from the source and heats the object. For example, a person standing in front of a fire is warmed by radiant heat from the flames. Induction heating is heating an object (often a bearing or metallic ring) by...
  8. Rodneywagr

    international power systems

    In Australian rural areas, there is also the single phase 480 V centre tapped system, (or is it 2 phase, 180 degrees apart?). The neutral is grounded, providing two supplies at 240 volts or one supply at 480 volts.

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