Here a "quick" fix if you are having this error message. Accumulation of dust and dirt inside modules creates DC bus distortion which makes the ripple value to increase near or above 13% threshold. This situation gets interpreted as a phase loss since in this case ripple increases too.
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| Supply Phase error message description. Taken from ACS800 Firmware manual System Control Program 7.x (3AFE64670646 REV G), ABB, 2011 |
So, first step is to check if you are experiencing a phase loss. You can do it by using the voltage meter on the door of the ACS800. If all three phases are ok well then it is time to clean your modules! but... How to know where to start? Easy, check out DC bus behaviour through Drive Windows for every stage (rectifier, inverter) and you will be able to spot where to start. Now it is time to give a call to your supervisor and notify that this make take a little while (1-2 hours in my experience). Before starting with the cleaning activity please remember to deenergize and apply your LOTO procedures.
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| DC bus before (yellow) and after (red) cleaning. |
Some extra considerations:
- Be careful with fibre optic connections to the modules. They may get damaged if you pull the modules without disconnecting them first. It sounds hard to happen but it does.
- Use the metal ramp to remove the modules considering ABB safety instructions.
- Use support legs of the module to prevent it from falling since its centre of mass is in the upper half of the module.
- Consider to measure DC bus in a regular basis. It helps to see how it changes over time so maintenance activities are scheduled before failure.
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| Using module's support legs. |
