T1689 Technical Manual Rev 07 Maintenance
MV3000 Air Cooled DELTA Removal of Modules for service or repair
Page 141
8.4 REMOVAL OF MODULES FOR SERVICE OR REPAIR
- Replace all shrouds and close all doors before energising the equipment.
• This equipment may be connected to more than one live circuit.
- Disconnect all supplies before working on the equipment.
• Wait at least 8 minutes after isolating supplies and check that the voltage between DC+ and DC- has reduced
to a safe level before working on this equipment.
• Surfaces on the following items can reach high temperatures and remain hot for some time after power has
been removed:
- Reactors and transformers
- Cables
• Items marked with weights greater than 20kg (44 lb.) should only be moved with lifting apparatus.
• This equipment contains solid state devices which may be affected by electrostatic discharge.
- Observe static handling precautions.
• Ensure that all conductors connected to this product are mechanically restrained.
• Where nuts, bolts and washers are supplied fitted to the terminal busbar, remove these fasteners, place the
user’s crimp (or busbar) directly against the terminal busbar of the unit and refit the fasteners. This is to
prevent large currents flowing through steel fasteners and causing overheating.
8.4.1 Preliminary Checks
Before commencing any maintenance or servicing tasks on a DELTA system check that:
• The warnings and cautions given above have been understood and followed;
• If a DELTA module is to be replaced, ensure that:
• All supplies have been isolated;
• A suitably rated crane is available;
8.4.2 Removal Of The Controller
Removal of the controller does not require any special equipment. The controller should be removed from the
enclosure by following the steps below. Refer to Section 5: CDM Assembly, for further information:
a) Remove the ribbon cable clamps (secured with M5 nuts) as required. Carefully cut and remove any
cable ties securing the wiring. Disconnect the ribbon cables, first noting their routing and positions;
b) Disconnect all remaining wiring from the controller by unplugging the connectors. It is not required to
remove individual wires from the terminals. Ensure that wiring is labelled to allow correct connections
to be made to the replacement controller;
c) Loosen (removal is not necessary) the four M5 fixing screws and remove the controller by lifting it free
of the screws.
8.4.2.2 Removal Of Optional Modules
If the controller has an optional communications module fitted, it should be removed at this stage. Refer to
the relevant instruction sheet for details.
To Next Page
Loading...
Need help?
General
