• fix
• WheelGrinder

fix/WheelGrinder

• 2024-11 left at bus stop opposite Takanini station
  • Bad state - switch missing and all wiring lose inside housing.

Markings / Identification

• Damaged name plate on the front
  • M?215A
  • Wheel Grinder
  • LEISTUNG ? HP ?
  • VOLTS 220 / 240V
  • CYCLES 50 Hz
  • RPM 2840 ?PM MADE IN JIANGSU STEEL GRINDER FACTORY CHINA

Chat GPT wiring suggestion looking at resistance in wiring

• Assumptions is this is a 3 speed configuration

Best Guess - one speed

Possible Three-Speed Configuration:

• High Speed:

  • Uses the shortest path (e.g., <bgcolor=”#ff0000”>Black to Red: 17Ω) for the main winding, resulting in the highest speed.

  Medium Speed:
  • Uses the intermediate path (e.g., Black to Green: 45Ω), engaging more of the winding for reduced speed.
  Low Speed:
  • Uses the longest path (e.g., Green to Red: 61Ω), engaging the entire winding or adding auxiliary windings, resulting in the lowest speed.

The capacitor would remain connected to the start winding (red) to assist in phase shift during startup, regardless of speed.

Three-Speed Wiring Logic:

A three-speed motor typically requires a switch capable of selecting different winding configurations. Here's how the connections might be arranged:

• Capacitor:
  • One terminal connects to red (start winding). The other terminal connects to the power supply or black (main winding).
  Power Connections:
  • High Speed:
    • Live (Brown): Connects to black. Neutral (Blue): Connects to red.
    Medium Speed:
    • Live (Brown): Connects to black. Neutral (Blue): Connects to green.
    Low Speed:
    • Live (Brown): Connects to green. Neutral (Blue): Connects to red.

Three-Speed Switch:

To control three speeds, you’ll need a rotary switch or a selector switch with at least three positions:

1. Position 1: High speed (shortest path, Black to Red).
2. Position 2: Medium speed (intermediate path, Black to Green).
3. Position 3: Low speed (longest path, Green to Red).