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Troubleshooting 10-25

1560D-UM051D-EN-P – February 2005

Figure 10.17 – 2300V Heatsink Module, 600A

Figure 10.16 – Removing and Replacing SCR1, SCR2 and SCR5

Snubber Resistors

Heatsink Assembly

Frame Assembly

Gate Driver Board

Sharing Resistor

Snubber Capacitor

Snubber Resistors

Heatsink Assembly

Frame Assembly

Gate Driver Board

Sharing Resistor

Snubber Capacitor

To Remove SCR1:

• Remove shorting bar hardware

• Pry Heatsinks 1 and 2 apart

• Extract SCR

To Insert New SCR:

• Apply thin film of electrical joint compound

to surfaces of SCR

• Install SCR so that it is seated in locating

pin of heatsink (note orientation of SCR).

• Pry heatsinks to close gap, ensuring that

SCR is seated properly in both its locating

pins.

• Rotate SCR so that all leads have same

direction.

Proceed to replacement of other SCRs in

the matched set (SCR2 and SCR5).

Note: You must replace all three SCRs

of a matched set.

Heatsink 6

Heatsink 1

Locating Pins

SCR5

Locating Pin

Heatsink 5

Heatsink 2

SCR1

SCR2

Heatsink 3

Shorting Bars

Shorting Bar