6.2.27 Group 71 Fieldbus Comm. ABB ACS800 CraneDrive Control, ACC800 7.1

Chapter 7 - Fault Tracing and Maintenance

7.4 Maintenance

The ACS 800 requires minimum maintenance. It is recommended that the unit be kept under more close monitoring after the start-up. There is only need for the routine check-up once operations have stabilised.

The following safety instructions should be followed in the maintenance work.

WARNING! The maintenance work should only be undertaken by a qualified electrician. No measurements, parts replacements or other service procedures not described in this manual should be attempted.

Disconnect mains power if fault tracing involves work inside the frame, the motor or the motor cable. Wait 5 minutes for the intermediate circuit capacitors to discharge. The ACS 800 can contain dangerous voltages from external control circuits. Exercise appropriate care when working on the unit. Neglecting these instructions can cause physical injury and death.

7.4.1 Heatsink

WARNING! The printed circuit boards contain integrated circuits that are extremely sensitive to electrostatic discharge. Exercise propitiate care when working on the unit to avoid permanent damage to the circuits.

The heatsink fins pick up dust from the cooling air. The rate of pick-up depends on the frequency converter usage and the amount and type of contamination in the ambient air. The heatsink needs regular cleaning to ensure heat dissipation. The ACS 800 can run into overtemperature

Warnings and Faults if the heatsink is not cleaned regularly.

In normal environment, the heatsink should be checked and cleaned annually. Frequency converters operating in extreme conditions will need to be cleaned more often. The best cleaning frequency must be tried out experimentally.

The dust should be removed gently with a soft brush if the cleaning is carried out in the same room where the unit is normally operated.

Compressed air should not be used for cleaning unless the installation can be taken apart and the cleaning is carried out in another room (or outdoors). Fan rotation should be prevented (in order to prevent bearing wear) when using compressed air for heatsink cleaning.

7-12 ACC 800 Firmware Manual