ABB PQFM Instruction Manual page 81

Table 30: List of possible alarm conditions that may trigger the alarm/digital outputs
Alarm condition
Supply voltage (RMS) unacceptably
high
Supply voltage (RMS) unacceptably
low
One of the phases of the supply is
missing
Network imbalance unacceptably high Vimbalance > 2%
Frequency variation unacceptably
high
PQFM DC bus voltage unacceptably
high
PQFM internal preload error
PQFM overcurrent fault
PQFM ground fault
PQFM IGBT fault
PQFM IGBT overtemperature
Control board temperature too high
PQFM internal power supply fault
PQFM control board fault
PQFM 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 62 can be adopted. Note however that the following behavior will result:
- The voltage applied to the external monitoring device will be low when:
o The filter is disconnected from the supply or when there is no error.
- The voltage applied to the external monitoring device will be high when:
o The predefined error is present for the predefined time (minimum 180s)
AND
o The external 24 Vdc power supply is in working order.
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
Figure 57 above.
Criteria to be fulfilled before contact is activated
Vrms_max > 110% Vnominal
Vrms_min < 90% Vnominal
Vrms_min < 60% Vnominal
Frequency variation > 20%/s
Vdc > 105% Vdc_max_allowed
DC capacitor voltage rise too low in preload phase or
the DC capacitors could not be preloaded in an
acceptable time.
Internal current higher than allowed
Internal ground current higher than allowed
IGBT hardware reports internal permanent error
IGBT hardware reports internal overtemperature
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.
Manual Power Quality Filter PQFM ç Electrical design and installation 81