Operating Principle Of The Re-Cooling Unit; The Internal Deionized Water Circuit; Table 3-1 Deionized Water Requirements - Siemens SINAMICS SH150 Operating Instructions & Installation Instructions

3.7.2

Operating principle of the re-cooling unit

The re-cooling unit dissipates the heat loss from the drive. The deionized water in the internal
water circuit absorbs the heat of the drive power unit which is to be dissipated. A maintenance-
free circulating pump pumps the hot water into the heat exchanger. The external raw water
circuit cools the hot deionized water. The cooled deionized water is pumped back to the drive.
3.7.3

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 requirements
Table 3-1
Conductivity during filling
Evaporation residue
pH value
● Content of metals in the hydrogen sulfide group (lead, antimo‐
● Content of metals from the ammonium sulfide group (iron, co‐
● Content of sulfur chloride and nitrogen compounds
Content of oxidizable, organic substances
SINAMICS SH150 6SL3805
Operating Instructions 05/2020
deionized water can be found in the documentation for the re-cooling unit.
Deionized water requirements
ny, tin, bismuth, arsenic, copper, cadmium)
balt, nickel, chrome, manganese)
Description
3.7 Re-cooling unit
Value
< 10 μS/cm
< 20 mg/l
5 to 9
Not detectable
Max. a quantity equivalent to the
usage of 30 mg/l potassium per‐
manganate KMnO4
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