ABB ACQ810 - Autochange

Program features 61
process actual value reaches the threshold level, after which normal process PID
control is resumed. A timeout for the whole pipefill phase can also be defined.
The following drawing illustrates the operation of the pipefill function.
Settings
Parameters 27.32 Pipefill ref acc (page 190) and 27.33 Pipefill ref dec (page 190);
parameter group 81 Pump protection (page 271).
Diagnostics
Parameters 06.20 Pump status word (page 130), 08.20 Pump fault word (page 133)
and 08.21 Pump alarm word (page 134).
 Autochange
The Autochange function can be used to equalize duty time between multiple pumps
by varying the sequence in which pumps are started as the required pumping
capacity increases.
There are three autochange modes selectable by parameter 78.01 Autochg style:
Actual value [%]
t
t
81.30 Req act
change
81.32 Pid enable dev
81.33 Pid enb dev dly
81.29 Pipefill
step
81.29
81.29
Speed reference [rpm]
81.30 Req act
change
27.32 Pipefill ref acc
PID controlPipefill