Redundancy (Reduced Run Capability); Removing A Dsu Module And Selecting The Reduced Run Feature - ABB ACS800 Hardware Manual

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Redundancy (Reduced run capability)

If one of the parallel-connected supply or inverter modules must be taken out of the
cabinet for service, it is possible to continue operation using the remaining modules
at reduced power.

Removing a DSU module and selecting the Reduced run feature

Note: The maximum number of removed DSU modules is limited to 50% of the
original number of parallel-connected modules.
WARNING! Read and follow the instructions in chapter
the instructions can cause physical injury or death, or damage to the equipment.
1. Switch off the power to the unit and open the main disconnecting device. Close
2. Let the intermediate circuit DC capacitors discharge for five minutes. Ensure by
3. Extract the module to be serviced from the cabinet. Follow the directions given in
4. Fasten the air baffle(s) provided with the unit to the top module guide (A) to
Maintenance
the grounding switch (option +F259) if there is one.
measuring that the drive is not live before starting the work.
section Connection procedure
block airflow through the empty module bay (B). See the figures below.
A
on page 79.
Safety instructions. Ignoring
B