Everything works well, but once in 15 times when I start
the saw (variable speed control button is set to low)it goes running on full speed, without soft
start, with high vibrations, breaking blades. How can I fix this problem? Is the
malfunction electronically generated or am I doing something wrong?
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With an ohmmeter between the prongs of the power plug and the switch turned on, rotate the motor and watch for a drastic change in the resistance. Theresistance should be fairky low.
IF during the rotation the resistance goes way up, there is a failure of an armature winding.
I notice it says variable speed, so the above may not work. The next plan is to bypass the speed control to see if the problem might be with the control... I suspect that is where the problem is. Bypass the control putting full voltage on the motor an see if it runs. If it does, then speed control has a problem.
There seems be problems with the electrical systems of the Dremel 1800 scroll stations (had same problem) Speedcontroller burns out and DC motor gets hit by Main AC voltage. Earth leakige due to low resistance between DC motor Rotor and earth (flowing current to earth) Measure rotor copper connections to earth to check for low resistance, should be very high. Biggest problem is that the main metal body under full main voltage comes and this is a dangerous situation!!!!!!!
All to fix is to repalce (both) fauly parts, Motor Controller and DC motor