ESAB Origo Mig L3000i Service Manual page 91

8 SERVICE INSTRUCTIONS
9. Gate pulses from 20AP1.
• Measure with the screen (gnd) connected to +24 V.
• The pulse frequency must be 40 kHz ±1 kHz.
• The pulse duration must be 41-44% of the cycle time, measured at -10 V of the
negative pulse, as shown in the graph below.
• If there is an interruption in the connection to the pulse transformer, the pulses are
shaped as shown in the graph below
10. Gate pulses to the IGBTs.
• Measure with the probe connected to the gate.
• The pulse frequency must be 40 kHz ±1 kHz.
• The pulse duration must be 40-44% of the cycle time, measured at +5 V, as shown
in the graph below.
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