Step 2: Setting The Address Of Each Unit In A Multi-Unit Filter And Terminate The Can Bus - Hitachi PQF Quick Start Up Manual

– Check the tightness of all connections including power cable connections section and tightness, CT connections,
digital I/O connections on the PQF-Manager and the control board connections inside the filter.
5.2. Step 2: Setting the address of each unit in a multi-unit filter and terminate the
CAN bus
Each filter is defined by a filter address. This address is by default set to 1.
In a filter system consisting of more than one unit, the filter with the lowest address will be considered as the first unit
in the chain. The filter with the highest address will be considered as the last unit in the chain: In master-slave filter
arrangements, it is recommended to assign the lowest address to the master unit and increment the address by 1 for
the next slave etc. In master-master arrangements, the lowest address must be assigned to the master unit that is
considered as the main controlling unit. When the main master unit is faulty, the master unit with the next lowest ad-
dress will become the main controlling unit.
In order to set the address of each unit in a filter system, the DIP switch module on the control board has to be set
accordingly.
Table 14 shows the filter unit addresses that can be chosen and the corresponding configuration to be set.
Table 14: Possible filter unit addresses and corresponding DIP switch settings (facing the board with ABB logo at the
Filter address DIP switch 1 setting (ID0)
1 Low
2 High
3 Low
4 High
5 Low
6 High
7 Low
8 High
Notes:
Assigning the same address to different filter units in one filter system will lead to the filter not being able to start up
and go in error (Bad Ratings)
When a filter consists of more than one unit, attention has to be paid to the proper termination of the communication
bus between the different units. This communication bus is depicted in the below figure by the black lines intercon-
necting the different units.
STATUS
Approved
–
top), counting low to high.
DIP switch 2 setting (ID1)
Low
Low
High
High
Low
Low
High
High
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DIP switch 3 setting (ID2)
Low
Low
Low
Low
High
High
High
High
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