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Reinstalling the module
1. Push the module carefully into its bay.
2. Fasten the retaining screws at the top and the bottom of the module.
3. Reinstall the DC busbars at the top of the module.
4. Reconnect the coolant pipes to the module.
WARNING!
To avoid breaking the coolant pipes, do not overtighten the nuts of the unions.
Leave 2 to 3 millimeters (0.08 to 0.12 inches) of thread visible.
5. Reconnect the control wiring to the module.
6. Fill up the cooling system. For instructions, see section
cooling
circuit.
7. Close the swing-out frame (if present). Reinstall all shrouds removed earlier.
8. If the Safe torque off function is in use, perform a validation test as described under
Start-up including validation test (page
Activating the reduced run of the inverter unit
A "reduced run" function is available for inverter units consisting of parallel-connected inverter
modules. The function makes it possible to continue operation with limited current even if
one (or more) module is out of service, for example, because of maintenance work. In
principle, reduced run is possible with only one module, but the physical requirements of
operating the motor still apply; for example, the modules remaining in use must be able to
provide the motor with enough magnetizing current.
Note: The wiring accessories and the air baffle needed during the procedure are included
in the delivery, and separately available from ABB.
WARNING!
Obey the instructions in chapter Safety instructions. If you ignore them,
injury or death, or damage to the equipment can occur.
1. Stop the drive and do the steps in section
you start the work.
2. Remove the shrouding above the module bay (in front of the DC fuses).
3. Remove the DC fuses and the busbar assembly connecting the fuses to the inverter
module. Store these parts – they are to be reinstalled only with the inverter module.
Make note of the order of washers.
4. Remove the faulty module from its bay. See the module replacement instructions.
5. Plug the coolant pipes disconnected from the module using the plugs that are included
in the drive delivery.
2...3 mm (0.08 ... 0.12" )
91).
Filling up and bleeding the internal
Electrical safety precautions (page 27)
Maintenance 63
before
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