Powermatic DDS-237, DDS-225 operating instructions Mechanical & Electrical Problems

Mechanical & Electrical Problems

Problem: Machine will not start, restart, or repeatedly trips circuit breaker or blows fuses

Possible Cause

Solution

1.No incoming power

2.Overload automatic reset has not reset

3.Sander trips frequently

4.Building circuit breaker trips or fuse blows.

5.Loose electrical connections.

6.Motor starter failure

7.Motor failure

8.Miswiring of the unit.

9.On/off switch failure

1.Verify unit is connected to power.

2.When sander 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.

3.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 the motor starter.

4.Verify that sander is on a circuit of correct size. If circuit size is correct, there is probably a loose electrical lead, Check amp settings on motor starter.

5.Go through all the electrical connections on the sander 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.

6.Examine motor starter for burned or failed components. If damage is found, replace motor starter. If motor starter looks okay but is still suspect, you have two options: have a qualified electrician test the motor starter for function, or purchase a new starter and establish if that was the problem on changeout.

If you have access to a voltmeter, you can separate a starter failure from a motor failure by first, verifying incoming voltage at 230 +/-20 VAC. If incoming voltage is incorrect, you have a power supply problem.

If voltage between starter and motor is correct, you have a motor problem.

7.If electric motor is suspect, you have two options: Have a qualified electrician test the motor for function or remove the motor and take it to a qualified electric motor repair shop and have it tested.

8.Double check to confirm all electric connections are correct and properly tight. The electrical connections other than the motor are pre-assembled and tested at the factory. Therefore, the motor connections should be double checked as the highest probability of error. If problem persists, double check the factory wiring.

9.If the on/off switch is suspect, you have two options: Have a qualified electrician test the switch for function, or purchase a new on/off switch and establish if that was the problem on changeout.

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