30
12.2 Submersible pumps
Submersible pumps normally have a short start-up
time. Trip class "P" can therefore be applied with
advantage for these pumps. It is possible to set very
short times down to for example 900 ms, used for
certain specific applications.
To prevent the Tempcon signal from one submersible
pump from interfering with the signal from another,
cabling must be carefully made to allow measure-
ments to be made of both pumps at the same time.
The motor cables must be kept apart and not
installed in the same cable tray. To avoid interfer-
ence, it may be necessary to fit a filter on the supply
cables. See fig. 24.
Fig. 24 Submersible pump installation with Tempcon
12.3 Wastewater pumps
Wastewater pumps may incorporate a PTC/thermal
switch to be connected direct to the MP 204.
Wastewater pumps may also be connected to a
Pt100/Pt1000 sensor. The sensor can also be con-
nected direct to the MP 204.
The Pt100/Pt1000 can be activated with the R100,
see section 9.4.9, or via a CU 401 control unit and
an OD 401 control panel.
A high IEC trip class is to be applied for wastewater
pumps, especially grinder-type pumps. Classes 25 to
35 are the optimum choice. Apply IEC trip class 45
for the pumping of liquids of extremely high viscosity
or liquids containing many solid particles.
TM03 1356 1805
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