8-8 Routine Maintenance and Repair
DC590+ Series DC Digital Drive
5. Remove the four screws that secure the failed Phase assembly front panel. Remove
the front panel.
6. Remove the bolts securing the fishplates to the DC Busbar nearest the failed fuse.
7. If the failed fuse is located underneath the AC busbar: slowly remove the ACCT's
fixing bolt and washer from the AC Busbar, supporting the ACCT and large
(rubber) washer as you do so. Remove the rubber washer and lower the ACCT to
one side.
8. Unplug the lead connected to the microswitch that is fitted to the side of the Fuse
Assembly.
9. The fuse is mounted on a plate. Remove the two bolts and washers that secure this
plate to the Phase Assembly and lift away the Fuse Assembly and DC Busbar.
10. On the bench, undo the central bolt from the Fuse Assembly taking note of the
placement of washers and other parts. Re-build the assembly with the new fuse.
Tighten the DC Busbar bolt to 45Nm (33 ft.lbf).
Refitting
1. Refit the Fuse to the Mounting Plate. Torque to 45Nm (33 ft.lbf). Fix the mounting
plate to the Phase Assembly, securing it with the two bolts and washers. Torque to 32Nm (23.6 ft.lbf).
2. Plug the lead back onto the microswitch (removed earlier).
3. Slide the AC busbar into in the Phase Assembly and secure with the bolt and washer. Torque to 45Nm (33 ft.lbf).
4. Refit the fishplates that connect to the DC Busbars. Torque to 55Nm (40.6 ft.lbf).
5. Offer up the Control Panel Assembly to the three Phase Assemblies and hang on the central support screws. Secure with 12mm x M6 screws and
washers.
6. Reconnect the flying leads of the Control Panel Assembly to the three Phase Assembly units. Tighten the retaining screws in the Field Controller
plug. Refer to Chapter 3: "Installing the Drive" - Frame 6: Assembly and Installation - Terminals.
7. Refit the front cover to the Control Panel Assembly, securing with the screws and washers. Connect the external earth to the Front Panel.
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