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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Chapter 5 - Exchange of Thyristors for Size A5
Find faulty thyristor
VI A
5 - 2
1. Find the defective branches by performing an OHM test (both
polarities) between U1, V1, W1 and C1, D1 (see figure 5-1)
V11
V24
F11
U1
V1
W1
F14
V14
V21
Figure 5-1
Anti-parallel B6-bridges with branching fuses
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 change both thyristors clamped be-
tween 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
V13
V26
V15
F13
F15
F16
F12
V16
V23
V12
DCS 500 / DCS 600 Service Manual
C1 (+)
V22
branching fuse
branch
V25
D1 (-)
principle_B6_a.dsf
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