ESAB Aristo Mig 3001i Service Manual page 51

9. Gate pulses from 20AP1.
S
Measure with the screen
(gnd) connected to +24 V.
S
The pulse frequency must be
40 kHz $1 kHz.
S
The pulse duration must be
41-44% of the cycle time,
measured at -10 V of the
negative pulse, as shown in
the graph to the right.
10. Gate pulses to the IGBTs.
S
Measure with the probe
connected to the gate.
S
The pulse frequency must be
40 kHz $1 kHz.
S
The pulse duration must be
40-44% of the cycle time,
measured at +5 V, as shown
in the graph to the right.
11. Primary side of the main
transformers
S
Measure with the probe
connected to DR1 and DR2
respectively.
S
The shape of the pulses
must be as in the graph to
the right.
ca41f2soft
S If there is an interruption in the connection to the
pulse transformer, the pulses are shaped as shown
in the graph to the left.
- 51 -
S0740 800 196/E101019/P76