3.5.13.3 The internal deionized water circuit
The internal water circuit is filled with deionized water (deionized, fully-desalinated water). The
conductivity of the cooling water must be ≤ 1 µS/cm in operation.
NOTICE
Material damage due to inadmissible additives in the deionized water
Inadmissible additives in the deionized water can cause the cooling system to fail. This could
damage the drive.
● Use only deionized water that corresponds to the specifications. The specification of the
deionized water can be found in the documentation for the re-cooling unit.
Deionized water requirements
Table 3-1 Deionized water requirements
Value
Conductivity during filling < 10 μS/cm
Evaporation residue < 20 mg/l
pH value 5 to 9
● Content of metals in the hydrogen sulfide group (lead,
antimony, tin, bismuth, arsenic, copper, cadmium)
● Content of metals from the ammonium sulfide group (iron,
cobalt, nickel, chrome, manganese)
● Content of sulfur chloride and nitrogen compounds
Not detectable
Content of oxidizable, organic substances Max. a quantity equivalent to the
usage of 30 mg/l potassium per‐
manganate KMnO4
3.5.14 Customer terminal strips
The default setting and interfaces of the customer terminal strips can be found in the circuit
manual. For information about the position of the customer terminal strips within the cabinet,
see the layout diagrams.
Description
3.5 Description of the components
SINAMICS SM150 6SL3845-2NN41-8AD2
Operating Instructions Rev.201910281310 EXAMPLE 45
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