Liquid Cooling ACU / ANG /AEC
6.4.2 Coolant supply control
The manufacturer recommends integrating a solenoid valve in the coolant supply line to control the
volumetric flow rate. The solenoid valve is controlled via a digital output with transistor output or a
multifunction output.
6.5 Measures against soiling of coolant and frost
The coolant must be chemically neutral and free from abrasive and other solids. It must not be aggres-
sive on the material. For the coolant quality, refer to Chapter 4.4 "Hydrologische Daten".
The user shall take appropriate precautions against soiling and furring-up, e.g. by installing an inlet
filter.
Typical soiling and common precautions include:
Use of the following filters:
Sieve filter
Gravel filter
Cartridge filter
Precoat filter
Softening of coolant by ion exchange
Moderate content of mechanical soiling and
hardeners
Addition of stabilizers or dispersing agents to coolant
Moderate content of chemical
soiling
Addition of passivating or inhibiting agents to coolant
biological impurities,
mucous bacteria and algae
Addition of biocides to coolant
If the heat sink or coolant are exposed to temperatures below 5°C, an appropriate frost protection agent
must be added to the coolant.
Device damage
Insufficient coolant quality can result in clogging up and/or corrosion of the heat sink and
impair the function of the frequency inverter cooling system. This can result in frequency
inverter damage.
Ensure sufficient coolant quality.
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