ABB DCS 500 Series Service Manual page 42

Chapter 6 - Exchange of Thyristors for Size C3
VI A 6 - 4
- Find the required torque from the table below. Tighten the
screws alternatively 1/4 turn at a time until the correct torque is
reached.
Converter type
400 V - 500 V
DCS x0x-0900-4(5)
DCS x0x-1200-4(5)
DCS x0x-1500-4(5)
DCS x0x-2000-4(5)
600 V - 690 V
DCS x0x-0900-6(7)
DCS x0x-1500-6(7)
Table 6-1 Mounting torques and forces for disc type thyristors
- In case of a 4-quadrant type converter:
• Perform the OHM test with both polarities another time to
make sure, the thyristor, which was used for the reverse
bridge, is definitly healthy.
• If this test indicates high resistance, the thyristor is healthy
and can be used.
• If this test indicates low resistance, the thyristor of the re-
verse bridge is faulty and needs to be replaced: remove it
again mount a new one as described above.
- Install in the fuse(s).
- Connect the lead of the snubber capacitor, if it was removed
before.
- Reconnect all parts, which were removed before:
• plastic covers, etc.
3ADW000093R0601_DCS500B/DCS600_Service Manual_e_f
Torque / Nm Force / kN
5,5 - 6 8 - 12
5,5 - 6 8 - 12
11,5 - 12 14,4 - 24
11,5 - 12 14,4 - 24
7,5 - 8 10 - 15
11,5 - 12 14,4 - 24
DCS 500 / DCS 600 Service Manual
Press
clamp
SLZF 89A
SLZF 89A
SLZF 89B
SLZF 89B
SLZF 89A
SLZF 89B