Preventive Maintenance; Recommended Regular Maintenance; Air Filters; Cooling Air Pressure Switch In Converter Modules Type D5 / D6 / D7 - ABB DCS800 Series Installation Manual

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Preventive Maintenance

WARNING! Before performing any maintenance the chapter
the beginning of this manual must be followed. Negligence of these instructions
can cause injury or death.

Recommended regular maintenance

The DCS requires very little maintenance if installed in an appropriate
environment. An annual check for dust accumulation and corrosion inside the
module / cabinet is recommended.

Air Filters

When air filters are used, the filters should be checked regularly depending on
environmental conditions. Clocked up filters prevent the proper cooling of the drive.
Wash dirty filters with water (60°C) and detergent.

Cooling air pressure switch in converter modules type D5 / D6 / D7

The cooling air pressure switch must be checked regularly.
The following actions have to take place:
−
Make sure electrical safety is performed.
−
Open the module's door and hold it in position to prevent any movement.
−
Repeat it with the cabinet's door.
−
Start the drive.
−
The air pressure switch is ok when the converter is switched off by F527
ConvFanAck - see ConvFanAck (10.30). Crosscheck this result with the
module's door closed.
Attention: Do not reach into the fan. Negligence to this warning can cause injury.

Fan

The lifetime of the cooling fan is about 20.000 to 40.000 hours depending on the
converter type. The actual lifetime depends on the usage of the DCS and the
ambient temperature.
Fan failure can be predicted by means of increasing noise from its bearings and a
gradual rise of the heatsink temperature. If the DCS operates in a critical part of
the process it is recommended to replace the fan once the above mentioned
symptoms appear.

Heatsink

The DCS will run into overtemperature faults if the heatsinks are not clean. In an
appropriate environment the heatsinks should be checked and cleaned annually.
Use compressed air to remove the dust from the heatsinks (the air flow must be
from bottom to top). Fan rotation caused by the compressed air must be stopped
in order to prevent damage.
Additionally use a vacuum cleaner to clean the dust from the air inlet and outlet.

Internal high current connections in converters type D7

The thyristors together with the heatsinks are stacked. Every single thyristor is
connected to the DC+ and DC- busbars via flexible copper busbars. These
Preventive Maintenance
3ADW000352R0101 DCS800-A Installation Manual e a
Safety Instructions at