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126 Maintenance
Reduced run
A "reduced run" function is available for supply/rectifier units consisting of
parallel-connected 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 enough current. For allowed configurations when using reduced
run function, see
ACS880 IGBT supply control program firmware manual
(3AUA0000131562
Starting reduced run operation
￭
WARNING!
Obey the safety instructions given in
cabinets and modules safety instructions (3AXD50000048633
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.
WARNING!
Use the required personal protective equipment. Wear protective gloves and
long sleeves. Some parts have sharp edges.
1.
Stop the drive and do the steps in section
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.
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.
[English]).
ACS880 liquid-cooled multidrive
Electrical safety precautions (page 43)
[English]).
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