Routine Maintenance and Repair 8-9
DC590+ Series DC Digital Drive
Replacing a Phase Assembly (Frame 6)
NOTE The Non-Regen Phase Assembly (2Q) weighs 28kg (62 lbs)
The Regen Phase Assembly (4Q) weighs 33kg (73 lbs)
With the front of the drive removed (the Control Panel Assembly), the replacement should take
about 20 minutes. Removing the Control Panel Assembly from the cubicle completely will make
access easier, but requires the removal of all connections made to it. It may be possible to support
the Control Panel Assembly (
11.25kg/25 lbs) and sling it away from the Phase Units far enough to
gain access.
Removal
1. Remove the plugs for the control wiring, auxiliary supply and field connections (loosen the
screws to remove the field plug). Remove the Protective Earth connections (PE).
2. Undo the fixings to remove the front cover from the Control Panel Assembly.
3. Disconnect the flying leads of the Control Panel Assembly from the three Phase Assemblies.
4. Remove the 12mm x M6 fixings in the four corners that secure the Control Panel Assembly.
Loosen the top and bottom central support screws (but do not remove) and lift the Control Panel Assembly away from the three Phase Assemblies.
5. Remove the bolts securing the fishplates to the DC Busbars.
6. Fit an M10 x 20mm long "temporary hanging" bolt to the "temporary hanging" mounting hole (top-centre) of the phase assembly to be removed.
Screw it in loosely, leaving a few millimetres of thread still showing.
7. Remove the fixing bolts that hold the failed Phase Assembly onto the back panel. Lift it off the "temporary hanging" bolt. Refer to the note about
weights at the top of the page.
Refitting
1. Hang the new Phase assembly onto the "temporary hanging" bolt. The fans should be at the bottom of the unit. Fit the 4 off M10 bolts and torque to
32Nm (23.6 ft.lbf).
2. Remove the "temporary hanging" bolt.
3. Refit the fishplates to the DC Busbars. Torque to 55Nm (40.6 ft.lbf).
4. Refit the front panel and secure with four screws and washers.
5. Offer up the Control Panel Assembly to the three Phase Assemblies and hang on the central support screws. Secure with M6 x12mm long screws
and washers.
6. Reconnect the flying leads of the Control Panel Assembly to the three Phase Assembly units. 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.
8. Connect the plugs for the control wiring, auxiliary supply and field connections (tighten the screws to secure the field plug). Remake the Protective
Earth connections (PE).
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