Cabling Of Warning Functionality - ABB PQFS Installation, Operation And Maintenance Instructions

Control board temperature too high
PQFS internal power supply fault
PQFS control board fault
PQFS unit down (i.e. not operational
due to error)
Remark: the alarm trigger levels cannot be changed by the user.
For cabling the digital output contacts as alarm contact, the same approach as shown in
Figure 53
The different electrical characteristics of the digital output contacts compared to the alarm
contact characteristics must be respected. Note also that all digital outputs have the
same common which is located at the pins 1 and 2 of the right hand terminal of the PQF-
Manager (rear view, counting from top to bottom). This is clearly indicated in
above.
A second use of the digital outputs is to monitor the status of individual master units in a
multi-filter system. This can be done by assigning the function 'Unit missing' ('Unit miss.)
to a digital output. In that case the digital output of the master controlling the complete
system will activate the digital output considered when one of the units in a filter system is
not operational due to error.
In order to obtain full redundancy with filters consisting of more than one master unit, the
digital outputs of all the units in a multi-master arrangement have to set up and cabled in
the same way. The cabling scheme is given in
Once the cabling has been finished,
6.12.3

Cabling of warning functionality

A warning condition is a condition that can be set up by the user in such a way that if the
condition is met, a digital output contact of the PQF-Manager user interface (Cf.
48) is closed. As an example consider a case where the user has set up an upper
warning level for the network voltage. If the level measured by the filter becomes higher
than the predefined warning level and this condition remains valid for a preset time, the
associated digital output will be closed. By monitoring the digital output, the customer will
then know when the network voltage becomes too high and subsequently he can take
appropriate action.
62 Electrical design and installation ç Manual Power Quality Filter PQFS
and can be adopted. Note however that the following behavior will result:
· The voltage applied to the external monitoring device will be low when:
The filter is disconnected from the supply or when there is no error
o
· The voltage applied to the external monitoring device will be high when:
The predefined error is present for the predefined time (minimum 180s)
o
AND
The external 24 Vdc power supply is in working order
o
· The auxiliary fuse box may be closed
· The filter top cover may be replaced including the connection of the PQF-
Manager to the master unit
· The power to the filter may then be restored
Internal control board temperature probe reports too
high temperature
Internal control voltage too low or not present
Internal control board reports an error
Any of the units in a multi-unit arrangement is not
running although the start-command has been given.
Figure 54.
Figure 48
Figure