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  1. PaulKraemer

    DC Motor Drive - Imbalanced input (line/neutral) and output (motor + / - ) current

    Thank you Gr8Blu and Waross for your replies - To answer Gr8Blu's questions: (a) Each of these these three blowers take inbound air from a duct routed from the blower inlet to outside the building where the equipment is located. The blower outlet pushes air through two inline filters (one 95%...
  2. PaulKraemer

    DC Motor Drive - Imbalanced input (line/neutral) and output (motor + / - ) current

  3. PaulKraemer

    DC Motor Drive - Imbalanced input (line/neutral) and output (motor + / - ) current

    Hi, I am trying to troubleshoot a blower drive system that includes a DC drive board [KB Electronics KBCC-255 (9940A)]. The DC drive board controls a 0-180 VDC output to a DC motor that drives a blower. The magnitude of the 0-180 VDC output is determined by a 0-10 VDC signal that the DC drive...
  4. PaulKraemer

    Looking to replace inductive prox switch in demanding application

    Thanks IRStuff. I am just hoping to find a sensor that will give me the most repeatable turn-on when the target (which I believe is 1018 steel) comes into it "field of view". Field of view is most likely not the best term, but I am hoping to find a sensor that would be as accurate as possible...
  5. PaulKraemer

    Looking to replace inductive prox switch in demanding application

    Hi, I am working on some registration controls on a printing press where we use an inductive proximity sensor to detect metal targets on a rotary screen coating station. The targets are mounted on an end-ring that holds the screen and has a gear that allows us to drive it. In the following...
  6. PaulKraemer

    10 VAC between line and ground when circuit breaker is off?

    Hi waross, IRStuff, Stevenal, PHovnanian, and TugboatEng, Thank you for helping be better understand why this voltage is present. Your help is greatly appreciated. Best regards, Paul
  7. PaulKraemer

    10 VAC between line and ground when circuit breaker is off?

    Hi, I am preparing to replace a control panel for an industrial machine. The new control panel is a direct replacement for the old control panel that has been in use for nearly 30 years - it just has new components that are still supported, whereas the old control panel has many unsupported...
  8. PaulKraemer

    DC motor that was exposed to foreign substance is surging

    Thank you Gr8Blu, CompositePro, and Waross for your detailed replies - This gives me things to investigate. To answer CompositePro's question, this motor is driving the whole Press. This is a very old press. I believe it was built in the 1980's or early 1990's. I suspect that the CMC drive...
  9. PaulKraemer

    Looking for NPN/PNP repeater or splitter

    Thank you Waross and Danw2 for your replies - My primary application is detecting gaps between labels on a moving web, and using the sensor output to actuate a print head and/or a vision system. I've been told that the line speed range is 10 to 100 ft/min, but most work is done at 20 to 40...
  10. PaulKraemer

    DC motor that was exposed to foreign substance is surging

    Hi, I am trying to troubleshoot a DC Motor and Drive Control System on a Printing Press. This is a 10 HP DC Motor with a field winding. It is controlled by a Cleveland MachineControls (CMC) PM3 drive. The speed reference to the drive comes from a digital potentiometer. Control is open-loop...
  11. PaulKraemer

    Looking for NPN/PNP repeater or splitter

    Thank you Waross, AK2DM, and 3DDave, All of these suggestions interest me. I didn't have immediate success with google to find a dual contact SSR with time delay capability, but I emailed my main supplier for control components to see if he has a suggestion. Waross' idea of rolling my own...
  12. PaulKraemer

    Looking for NPN/PNP repeater or splitter

    Thank you Waross - I've used SSR's in heating applications where I have a closed loop temperature controller with a switched DC output that switches the SSR coil on and off in short intervals in a time proportioned manner to regulate the power delivered to a resistance heater. I should have...
  13. PaulKraemer

    Looking for NPN/PNP repeater or splitter

    Hi, I work with continuous web handling equipment on which I use sensors to detect features on a moving web. The feature I want to detect can be gaps between labels, a registration mark, or defects. Regardless of the sensor technology (photosensor, laser, ultrasonic, etc), they usually have...
  14. PaulKraemer

    Push-Pull Sensor output versus NPN/PNP

    Hi RedSnake, Thank you for your thorough response. That is a big help. It seems to me like the Baumer sensor will very likely work for us. Looking over the considerations in the Baumer guideline document you sent a link for, (and please correct me if I am wrong) it seems like Push-Pull is...
  15. PaulKraemer

    Push-Pull Sensor output versus NPN/PNP

    Hi, I have a label inspection machine that makes use of Tri-Tronics Label-Eye LERC label sensor. This machine processes a continuous series of labels that are adhered to a backing material. The sensor detects the gaps between each label. This is a "fork" style sensor that requires the labels...
  16. PaulKraemer

    Calculating resistance in a 3 phase heater circuit

    Hi, I have a three phase resistance heater as shown in the attached diagram. I know the formula for power is P = I * E * 1.732. Based on the information shown, this comes to P = 22.6 * 480 * 1.732 = 17,789 watts. This is pretty close to the 18,650 watts shown on the diagram, so this...
  17. PaulKraemer

    preferred orientation of disconnect handle

    Hi Rich, Waross, IRStuff, and Che, Thank you all for you input. It is very much appreciated. The case that handle pointing down (6:00) would be OFF and handle pointing left (9:00) would be ON seems logical to me. A switch like this wouldn't be affected by gravity, but if it were, gravity...
  18. PaulKraemer

    preferred orientation of disconnect handle

    Hi Che, Waross, IRStuff, and Rich, Thank you for your replies. It makes sense to me that it should be easier to turn the switch OFF than it is to turn it ON, and if gravity were to have an effect, gravity should turn it OFF rather than ON. This makes me think that mounting the switch so that...
  19. PaulKraemer

    preferred orientation of disconnect handle

    Hi, I am going to be using a control panel door mounted disconnect for which the handle looks like this ... ... This handle is constructed so that it will rotate 90 degrees clock-wise from the OFF position to the ON position. It seems this will allow me to mount this in a few different...
  20. PaulKraemer

    confusion with UL508A wire color recommendations

    Hi JRaef and Lionel, Thank you for your replies. I wish I had the budget to participate in the training that would be required to become a UL listed shop, but I do not. My company has recently ceased to manufacture new equipment. The specific project I have been asking questions about is to...

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