ABB PQFM Instruction Manual page 137

For setting up the 'standby' function, go to [/Welcome/Settings/Installation set./Start-
Stop set.]
In multi-master units these functions need to be set up in each master-unit in order to
obtain full redundancy.
The 'standby' function when enabled puts the filter in standby, a preset time after the
load requirement disappears. In this condition, the IGBTs stop switching while the main
contactor remains closed (filter remains connected to the network). This way the filter
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 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.
- '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.
Manual Power Quality Filter PQFM ç The PQF-Manager user interface 137