ESAB Caddy Tig 2200i AC/DC Service Manual

S0740 800 179/E071123/P64
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Checking the gate signals to AC power board 18AP2
The gate voltage is +15 V when the IGBTs are conducting.
The gate voltage is -- 10 V when the IGBTs are open.
Measure the gate voltage across varistors D4, D6, D12 and D16.
Measuring points a and b in the diagram.
1. Switch on the machine
2. Select MMA mode and positive polarity. IGBT1 and IGBT4 must be conducting.
3. Select MMA mode and negative polarity. IGBT2 and IGBT3 must be conducting.
If the gate voltage is missing at any of the measurings, check the output from 18AP1 by
measuring across measuring points c and b in the diagram.
Circuit diagram AC power board 18AP2, measuring points gate signals

ESAB Caddy Tig 2200i AC/DC Specifications

General

AC Frequency	20 - 250 Hz
Dimensions	418 x 188 x 345 mm
Weight	15 kg
Protection Class	IP23
Frequency	50/60 Hz
Duty Cycle (TIG DC, 220A)	25%
Duty Cycle (TIG AC, 220A)	25%
Input Voltage	230 V
Current Range (TIG AC/DC)	220 A