ABB PQFS Installation, Operation And Maintenance Instructions page 101

losses become virtually zero. The filter will resume normal operation a preset time after the
load requirement comes back. The standby function is particularly interesting for
applications where the load is present for a long time and subsequently switches off for
another long time.
In order to set-up the standby function, five parameters have to be defined:
· 'Stdby status':
When enabled, the 'standby' function is activated.
When disabled, the 'standby' function is deactivated.
· 'Standby level' and 'Standby hyst':
Define the filter load level in % on which the filter goes in standby and comes out
of standby.
· 'Stdby del off':
Defines the time during which the filter load level has to be smaller than the lower
threshold level before the filter is put in standby.
· 'Stdby del on':
Defines the time during which the filter load level has to be higher than the
upper threshold level before the filter comes out of standby.
The filter standby parameters are illustrated in
Filter load requirement (%)
Stdby del off
Filter operation
ON
OFF
Figure 73: Illustration of the filter standby parameters
Remarks:
· The filter load requirement is determined from the user settings for harmonic
filtration, reactive power compensation and balancing
Figure
Stdby del on
Manual Power Quality Filter PQFS ç The PQF-Manager user interface 101
73.
Standby hyst.
Standby level
Standby hyst.
Time
Time