Powermatic DDS-225, Operating Instructions And Parts Manual

19

Mechanical & Electrical Problems 

Problem: 

Machine will not start, restart or repeatedly trips circuit breaker of 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 
220 +/- 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 

electrocution 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.