AC800M : Glass Fuse selection and Power Supply Filtering
2) The Power supply manual –SD834 shows that there is a line filter and the filter return is the PE terminal, as marked in yellow color below
· Kindly help us to find the installation manual requirement on how the filter return should be wired ?
Answers
Please have a look in corresponding product/system manual, e.g. 3BSE020923-510 or 3BSE036351-600 or other.
There is provided the necessary data for configuration and installation, including recommended input and output external protection.
Particularly, for SD834 is recommended 10-20A external input fuse, which could be MCB characteristic C or delayed action fuse. It depends on which input voltage you apply to SD834 module, also AC or DC.
You can see also input rated power at different input voltages so you can calculate yourself the input protection for SD834.
SD834 has internal fuse at input side. The PE line marked with yellow shows, that the metal body of the module is connected internally to PE terminal.
Source: 3BSE020923-510
Below is statement which power supply they uses in site :
All equipment feeders must use three conductor cables (line ,NEUTRAL and earth ) , This provides a defined return path for power line interference and as a result optimizes the efficiency of line filters inside the equipments.
As per ABB SD834 power supply internal diagram Input filter is part of the power supply
Is it mandatory for ABB power supply to connect power earth signal to earth cable coming from he UPS , Instead of connecting to panel earth?
Hi,
Please find attached a single document for power supply modules, that I found.
I can assume the following:
PE terminal have to be connected to the Protective Earth terminal (PE) for safety reasons and for proper operation of the input filter. I don't know the internal diagram of the module, may be there are some RLC filter, which will need PE.
If the PE terminal is connected to the metal body of the power supply (you can measure that), then when you install SD834 module on DIN rail, it will be connected to the cabinet. If the cabinet is earthed (and it must be), the power supply will be connected to that earth too.
I personally don't know if that kind of connection is approved/certified for safety reasons. I always provide a separate PE by wire to the PE terminal.
You have to check if UPS's PE is connected to supply net's PE, I think it have to be for safety reasons and as per regulations. Even the output of UPS is isolated, PE should be the same for input and output (also to the metal body of the UPS).
Connection is depending on your local safety regulations. In common case I think you will need to have a common PE for all your components - UPS, power supply, cabinet.
You can have a look in manual 3BSE020923R4101 too (or actual version General Information and installation of S800IO) - there is a good description about the grounding philosophy, and also I found the following diagram of similar power supply modules:
Source: 3BSE020923R4101
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