35
Exchange of Thyristors for Size D1 to D4
3ADW000195R0501 DCS800 Service Manual e e
OnBoard bridge and thyristor modules
Nominal mounting torque
Size Type Electrical
connections
Thyristor module
to heat sink
29 mm bridge block VVZF 70-16 - 5 Nm
20 mm block SKKT 27, 42, 57, 106 3 Nm 5 Nm
20 mm block MCC 26, 44, 56, 95 2.5 ... 4 Nm 2.5 ... 4 Nm
34 mm block MCC 162 4.45 … 5.5 Nm 2.25 … 2.75 Nm
34 mm block SKKT 162 5 Nm 5 Nm
34 mm block TT 162 6 Nm 6 Nm
50 mm block MCC 255 11 … 13 Nm 4.5 … 7 Nm
50 mm block TT 250, 330 12 Nm 6 Nm
60 mm block TT 425, 570 12 Nm 6 Nm
Nominal mounting torque for OnBoard bridge and thyristor modules
7. Reinstall the current transformer, make sure, its position is correct.
8. Reinstall the busbars, make sure, the correct torque is applied according to
table Nominal mounting torque for OnBoard bridge and thyristor modules
on
page 35.
9. Reconnect all gate leads to the thyristor module.
10. Reinstall the SDCS-PIN-4 board.
11. Reconnect all cables and plugs at the SDCS-PIN-4:
snubber resistor (X30, X31),
temperature sensor (X22),
current transformers (X3, X4, X5),
OnBoard excitation (X8, X9, X11), use proper winding direction and amount
of windings for T100
gate leads (first X16, X18 then X15, X17),
OnBoard excitation line voltage (X1, X2, X7),
all plugs (X10, X96, X99) and
all flat cables (X12, X13, X37), use the lock connectors at the SDCS-PIN-4
12. Reconnect the flat cables at the SDCS-CON-4 (X12, X13, X37) and re-hinge
the electronic tray.
13. Reconnect the grounding plug and the holding screw at the electronic tray.
14. Reconnect all I/O plugs at the SDCS-CON-4 (X3 to X7) and the plugs at the
SDCS-DSL-4 (X51 to X54).
15. Reinstall the intermediate cover, all plug in options and the design cover.
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