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Dahlander Motor Connection: A Simple Guide for Electrical Engineers

Motors are the backbone of modern industry, powering everything from heavy machinery to everyday appliances. Among the many types of motors, the   Dahlander motor   stands out for its ability to operate at two different speeds. Also known as a   pole-changing motor   or   two-speed motor , it achieves this by altering the number of poles in its winding configuration. In this post, we’ll break down how Dahlander motors work, their benefits, drawbacks, and where they’re commonly used      What is a Dahlander Motor? A Dahlander motor is a specialized type of  AC induction motor  designed to run at two distinct speeds. This is made possible by changing the number of poles in the stator winding. The speed of an AC motor depends on the number of poles and the supply frequency, as described by the formula: Synchronous Speed (Ns) = 120 × Frequency (f) Number of Poles (P) Synchronous Speed (Ns) = Number...
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How to Wire High Pressure Sodium Lamps: A Step-by-Step Guide for Efficient Lighting

 High Pressure Sodium (HPS) lamps are known for their efficiency, affordability, and durability. These attributes make them widely used for industrial lighting and outdoor public areas such as roadways, warehouses, and parking lots.

The Family of High-Intensity Discharge (HID) Lamps

HPS lamps belong to the family of High-Intensity Discharge (HID) lamps, which also includes metal halide and mercury vapor lamps. These lamps function by sending an electric discharge between two tungsten electrodes through xenon gas, which helps initiate the lighting process.

The Components of HPS Lamps

HPS lamps contain a few key components:

  • The Lamp: The central part of the circuit.
  • The Igniter: Used with the ballast to send electric discharges to the lamp to initiate the lighting process.
  • The Ballast (Choke Coil): Limits the current in the circuit.
  • The Capacitor: An optional component used to improve power factor.

Step-by-Step Wiring Guide

1. In case of 2 pins choke coil

Components Needed:

  • AC power source
  • HID ballast (for HPS and metal halide lamps)
  • Electronic igniter
  • HPS lamp
  • Optional: Capacitor for power factor correction

Connection Process:

  1. Connect the Ballast: Connect the line from the AC source to one terminal of the ballast. Connect the second terminal of the ballast to the igniter's terminal B.
  2. Connect the Igniter and Lamp:
    • Connect the igniter's LP terminal to one terminal of the lamp.
    • Connect the neutral wire to the igniter's N terminal and also to the second terminal of the lamp.
  3. Add the Capacitor: To improve power factor, connect the capacitor in parallel with the power supply.
  4. Check Ratings: Ensure that the rated power of the lamp matches that of the ballast and igniter to avoid overload or failure.

2. Working with HID Ballasts (3 pins or more)

Some HID ballasts have two or three taps depending on the manufacturer. You must follow the connection diagram provided on the ballast. For example, with a three-tap ballast from ELT:

  • Connect the line source to terminal 3.
  • Connect terminal 2 to the black wire on the igniter.
  • Connect the igniter's blue wire to the neutral and one terminal of the lamp.
  • Connect terminal 1 on the ballast to the red wire and the second terminal of the lamp.

Wiring with Magnetic Ballasts

Older magnetic ballasts have different input terminals depending on the voltage. For example, if you are working with a 240V source, choose the correct terminal and connect it to the input. For the igniter:

  • Connect terminal X3 to the common terminal of the ballast.
  • Connect terminal X1 to the lamp and the last terminal of the ballast.
  • Connect terminal X2 to the neutral and the second terminal of the lamp.

Final Notes

Before powering up your HPS lamp, double-check all connections and ensure that the ratings of the components are compatible. This will prevent electrical faults and ensure the longevity of the circuit.

Feel free to explore more resources and helpful diagrams in the description. For more insightful content, join our community at Electrical Engineering Planet.

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