1. Stop the drive and do the steps in section Electrical safety precautions (page 21)
before you start the work.
2. If the control unit is powered from the faulty module, connect the control unit to
another 24 V DC power supply. ABB strongly recommends using an external power
supply with supply/rectifier units consisting of parallel-connected modules.
3. Remove the module to be serviced from its bay. In 12-pulse DSU setups, the number
of modules in both windings must be equal, which means that at least two modules
have to be removed at once.
4. Install an air baffle (for example, plexiglass) to the top module guide to block the
airflow through the empty module bay.
5. Switch on the power to the supply/rectifier unit.
6. Enter the number of supply/rectifier modules present into parameter 195.13
Reduced run mode.
7. Reset all faults and start the supply/rectifier unit. The maximum current limit is
now automatically set according to the new configuration. A mismatch between
the number of detected modules (parameter 195.14) and the value set in 195.13
will generate a fault.
Resuming normal operation
WARNING!
Obey the safety instructions given in ACS880 multidrives cabinets and
modules safety instructions (3AUA0000102301 [English]). If you ignore
the safety instructions, injury or death, or damage to the equipment
can occur.
If you are not a qualified electrical professional, do not do installation
or maintenance work.
1. Stop the drive and do the steps in section Electrical safety precautions (page 21)
before you start the work.
2. Remove the air baffle from the module bay.
3. Reinstall the module into its bay.
4. Switch on the power to the supply/rectifier unit.
5. Enter "0" into parameter 195.13 Reduced run mode.
￭
Activating the reduced run function 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.
WARNING!
Obey the safety instructions of the drive. If you ignore them, injury or
death, or damage to the equipment can occur.
Refer to the drawing below.
210 Maintenance
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