Deionized water requirements
Table 3-1 Deionized water requirements
Value
Specific conductivity on 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
Ion exchanger
An ion exchanger is installed in the re-cooling unit. The ion exchanger is connected in the
deionized water circuit.
If the conductivity exceeds the permissible limits, then a message is output. In this case,
replace the filling in the ion exchanger with an original filling. If the conductivity continues to
rise, the re-cooling unit and drive are switched off. The ion exchanger is a consumable and is
not covered by the warranty.
Dirt filters
The re-cooling unit is equipped with several dirt filters
● A dirt filter with a sieve (mesh width: 0.5 mm) is located in front of the drive intake.
● A fine filter (mesh width: 0.05 mm) is located at the ion filter outlet.
● An air filter is fitted on the expansion tank.
that filter out dirt and contamination from the water circuit, thereby preventing the drive from
being damaged.
Pump pressure
A manometer displays the pump pressure. If the flow is excessively low, then the re-cooling
unit automatically switches over the pumps.
Description
3.3 Re-cooling unit
SINAMICS SM120 6SL38855?B
Operating Instructions 12/2015 31
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