I have a two speed 240V pump motor on a boat that will start in low and switch over to high with no problem, but will not start in high speed.
I've replaced the cap just for GP (the old one tested in tolerance) but it didn't change the symptoms. I've cleaned the contacts for the high-speed winding and still no change. Any thoughts before I pull it out? It's not easy to get to.
ChatGPT from
- *Capacitor Functionality*: You've replaced the capacitor, but it's worth double-checking if it's the right type and value for your motor's high-speed operation.
- *Winding Issues*: There might be a problem with the high-speed winding itself, like an open circuit or insulation issue, preventing it from starting directly in high.
- *Contactors/Switches*: Although you've cleaned the contacts for the high-speed winding, ensure they're functioning properly and making good connections when switching to high.
- *Voltage Drop*: High inrush current when trying to start in high speed might be causing a significant voltage drop, especially if your boat's electrical system isn't robust enough.
- *Mechanical Load*: Consider if there's excessive mechanical load or binding that's preventing high-speed start but allows low-speed start and switching.
- *Control Circuit*: Check if there's a specific control circuit or relay involved in switching speeds; maybe there's an issue there affecting high-speed start.
Next Steps
- *Check Voltage*: Measure voltage at the motor terminals when attempting to start in high speed to see if there's a significant drop.
- *Inspect Wiring*: Look for any signs of damage or loose connections specific to the high-speed circuit.
- *Consult Manual*: Refer to the motor's documentation or manufacturer's troubleshooting guides if available.
