Single-Pit And Multi-Pit Mode - Grundfos CIU 202 Functional Profile And User Manual

10.4 Single-pit and multi-pit mode

10.4.1 Single-pit mode
In single-pit mode, all pumps connected to the CIU unit are
installed in the same pit. The electronics in the pumps ensure that
the load is automatically distributed among the pumps, meaning
pump alternation or operation in parallel, if necessary.
Actual pit mode can be read from register 00203.
P1 P2
Fig. 18 Single-pit mode
10.4.2 Multi-pit mode
In multi-pit mode, all pumps connected to the CIU unit are
installed in separate pump pits. One CIU can monitor up to four
pits. The pumps operate as individual pumps.
P1 P2
Fig. 19 Multi-pit mode
In multi-pit mode, the CIU unit does not regard the connected
pumps as one system, but as four systems with their own
settings.
CIU will not monitor parameter mismatch between pumps or
calculate common pit parameters.
Switching between single-pit and multi-pit mode can only be done
via the Grundfos PC Tool Water Utility for sewage applications or
with a Grundfos remote control (Service mode). Details can be
found in the SEG AUTO
ADAPT
It is not possible to combine single-pit mode and
multi-pit mode.
CIU
P3
P4
CIU
P3 P4
multi-pit application note.
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