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INVERTER BOARD RESISTANCE TEST (continued)
Connector for
PTC thermostat
TH1
Resistor R4
TEST PROCEDURE
1. Remove main input power to the CITOTIG 315DC or 415DC
2. Perform the Discharge procedure
3. Visually check for burned or damaged components. If any components are physically damaged the
inverter board and damaged components should be replaced
4. Check the PTC thermostat TH1, connected to the green connector (see picture above), with ohmmeter;
correct value should be 57ohms +/- 20% @ 25°C
5. Check the resistor R4 between points 1 &2 (see picture above), correct value should be 100 ohms +/-
20%, when inverter is fully connected to the machine harnesses.
6. Check each IGBT module (Q1,Q2,Q7,Q8), with multimeter in diode test mode, following the table below:
E
E
G
C
C
G
E
E
1
W05X1327-1 used on 315DC
W05X1327-2 used on 415DC
IGBT modules - table tests
Positive Probe (RED)
Negative Probe (BLACK)
Emitter (E)
Collector (C)
Collector (C)
Emitter (E)
Emitter (E)
Gate (G)
C
G
E
E
E
E
G
C
2
Value
0.3V - 0.7V
Open
0.2V - 0.7V
39
4 IGBT modules
located under the
inverter printed circuit
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