4701

Common Causes

• Chip conveyor clogged with chips putting the motor under excessive load
• Conveyor chain or scraper jammed by a long stringy chip bundle or a foreign object
• Motor overload relay heater element worn or mis-sized
• Conveyor motor bearing or gearbox failure raising current draw

Troubleshooting Steps

1. 1Read the code number shown with the alarm: code None = Overload of the chip conveyer motor tripped.; code 1 = Overload of the 1st inside machine conveyer motor tripped.; code 2 = Overload of the 2nd inside machine conveyer motor tripped.; code 3 = Overload of the scraper conveyer motor tripped.; code 4 = Overload of the conveyer reverse pump motor tripped.
2. 2Read the code: no code means the main chip conveyer motor overload tripped; 1 is the 1st inside machine conveyer, 2 is the 2nd inside machine conveyer, 3 is the scraper conveyer, 4 is the conveyer reverse pump motor.
3. 3Check the indicated chip conveyer for clogging with chips as the manual directs: clear the chip buildup, especially at the discharge and any tight turns.
4. 4Inspect the conveyor chain, flights and scraper for a jammed chip bundle or foreign object and remove it with the conveyor locked out.
5. 5Reset the motor overload relay, run the conveyor and watch its current; current climbing again points to mechanical drag rather than a one-off jam.
6. 6If the overload trips with a clean conveyor, check the motor, gearbox and overload heater element before returning the conveyor to service.