Value
● Content of metals in the hydrogen sulfide group (lead, antimo‐
ny, tin, bismuth, arsenic, copper, cadmium)
● Content of metals from the ammonium sulfide group (iron, co‐
balt, 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.
3.7.4 The external raw water circuit
The raw water flows through the heat exchanger. The heat exchanger cools the deionized
water.
Description
3.7 Re-cooling unit
SINAMICS PERFECT HARMONY GH150 6SL3825
34 Operating Instructions 05/2020
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