Service manual FastMig Pulse power sources version 1.1
Service manual FastMig Pulse power sources version 1.1
Service manual FastMig Pulse power sources version 1.1
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Safety test<br />
Safety test should be carried out before opening machine or connecting it to the mains <strong>power</strong><br />
supply, to protect the service technician.<br />
All the new machines are tested in the factory, but it is recommended to repeat these tests before and after service repair work.<br />
The safety test is divided into two parts, protective earth (PE) conductor continuity and insulation resistance measuring.<br />
PE conductor continuity measuring:<br />
PE continuity is measured between protective earth conductor and machine chassis. Resistance should be less than 100mΩ<br />
(0,1Ω). Below is a calculation to determine the desired test voltage<br />
R = 100mΩ<br />
I = 15A<br />
U<br />
= ?<br />
U = R × I = 0,1Ω×<br />
15A<br />
= 1,5V<br />
When using 15A as the measuring current, the voltage should be less<br />
than 1,5V between PE conductor and machine chassis. Then the<br />
resistance must be less than 100mΩ.<br />
Easiest way to measure PE conductivity is to have special tester like<br />
Megger PAT32. It tests conductivity using an input current of 25A, so<br />
voltage should be less that 2,5V.<br />
The protective conductor continuity measuring can be<br />
done with equipment similar to that shown in these<br />
pictures
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