Measurement Measuring point Measured
value
Primary → secondary Mains plug L/N → Current sockets ³ 5 MW
Primary → Earth Mains plug L/N → Earth ³ 2.5 MW
Secondary → Earth Current socket → Earth ³ 2.5 MW
Primary → Gas preheater Mains plug → Gas preheater connection ³ 5 MW
1 Measuring device
2 Test piece
9 Measuring line
WARNING!
An electric shock can be fatal.
Capacitors can charge during the insulation resistance measurement. After carrying out
the insulation resistance measurement, check that all tested potentials are de-energised
before continuing with the safety inspection. Alternatively, the capacitors can be dis-
charged by short-circuiting the tested potentials or via the discharge function on the insu-
lation tester.
Open circuit
voltage
- Peak value measurement of open circuit voltage at the power source current sock-
ets
- The measurement must be performed using the "Measuring circuit for U
0
measure-
ment" (43,0001,0945)
- The measurement must be performed in MIG/MAG mode
- The open circuit voltage must not exceed the value specified on the rating plate
when supplying the power source with rated welding voltage - tolerance +/- 10 %
Open circuit voltage testing procedure:
- Connect the testing circuit and the multimeter to the power source
- Set the multimeter to DC voltage measurement and the measuring circuit to U
PEAK
- Briefly press the Reset button to discharge the capacitors
- Actuate the torch trigger
- Adjust the potentiometer until the largest voltage value is shown
60
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