ABB Chapter 2 - Checking IGCTs and Diodes
ACS 6000 Maintenance Manual 3BHS202077 ZAB E01 Rev. C 2-5 (6)
Figure 2-4 Extracting the Phase Module
6 Check the diode using the multimeter in diode verification mode and
suitable probes.
Expected result of the measurement:
If uncertain, verify the result by checking another diode of the same phase
module or of another phase module.
Table 2-1 Voltage Measurement
Diode
Voltage between
Anode/Cathode
Voltage between
Cathode/Anode
VR1, VR4, VC1, VC2 ~ 0.2.....0.3 V out of range (diode is blocking)
VR2, VR3, VN1, VN2 ~ 0.2.....0.3 V ~ 2.2.....2.3 V
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