JET Tools JWP-15HH User Manual - Page 22

11.2 Mechanical and electrical problems Trouble Probable Cause Remedy Uneven depth of cut side to side. Knives are worn. Cutterhead not level with bed. Replace knives. Level the bed. Board thickness does not match depth of Depth of cut scale incorrect. cut scale. Adjust depth of cut scale. Inadequate tension. Adjust chain tension. Chain is jumping. Sprockets misaligned. Align sprockets. Sprockets worn. Replace sprockets. Machine will not start/restart or repeatedly trips circuit breaker or blows fuses. No incoming power. Verify unit is connected to power. Overload automatic re-set has not reset. When the planer overloads on the circuit breaker built into the motor starter, it takes time for the machine to cool down before restart. Allow unit to adequately cool before attempting restart. If problem persists, check amp setting on the motor starter inside the electrical box. Planer frequently trips. One cause of overloading trips which are not electrical in nature is too heavy a cut. The solution is to take a lighter cut. If too deep a cut is not the problem, then check the amp setting on the overload relay. Match the full load amps on the motor as noted on the motor plate. If amp setting is correct then there is probably a loose electrical lead. Check amp setting on motor starter. Building circuit breaker trips or fuse blows. Verify that planer is on a circuit of correct size. If circuit size is correct, there is probably a loose electrical lead. Check amp setting on motor starter. Loose electrical connections. Go through all the electrical connections on the planer including motor connections, verifying the tightness of each. Look for any signs of electrical arcing which is a sure indicator of loose connections or circuit overload. 22