motor protection switch triggers

Common causes

• Unplugged cable to the drive
  
  • Harting connector on the drive
• Blocked / jammed / wedged accumulation roller chain
  • especially with head drives that have run in the wrong direction during initial commissioning
  • damaged bearings
  • blocked chain gears due to foreign objects
• Heavily soiled chain guide profiles
  • especially after longer system shutdowns over the weekend / after the holiday period

Problem solution

• Check the electrical connection between the inverter and drive
  • It is also possible that individual phases within the plug wiring have no electrical connection
• Making the accumulation roller chain operational again (especially with head drives during commissioning, partial disassembly may be necessary)
• Cleaning the chain guide profiles
• check / replace the bearings
• check the chain gears for blockages