Find Faulty Thyristor - ABB DCS 500B Service Manual
Dcs thyristor power converters
for dc drive systems
25 to 5200 a
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Also See for DCS 500B:
- Operating instructions manual (76 pages) ,
- Description (228 pages) ,
- Service manual (73 pages)
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Find faulty thyristor
DCS 500 / DCS 600 Service Manual
1. Find the defective branches by performing an OHM test (both
polarities) between U1, V1, W1 and C1, D1
2. Disconnect the branch fuses of the defective branches.
3. Find the defective thyristors by performing an OHM test (both
polarities) over their heat sinks.
4. In a 4 - quadrant converter with BCT's change the BCT.
5. In a 4 - quadrant converter with 2 single thyristors change both
thyristors clamped between the same heatsinks at once.
Note: Because "Disc Type" semiconductors need a certain
compression force to operate properly a measurement outside
the clamped heat sinks might be wrong. To be sure change only
one thyristor, clamp the heat sinks again and repeat step three.
3ADW000093R0701_DCS500B/DCS600_Service manual_e_g
Chapter 6 - Exchange of Thyristors for Size A6
(see figure
5-1).
VI A
6 - 3
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