Special Requirements For Open And Half-Open Cooling Systems; Connection To The Cooling System; Coolant Temperature And Moisture Condensation; Table 24: Special Requirements For Open And Semi-Open Cooling Systems - KEB COMBIVERT H6 Series Instructions For Use Manual

cOOLING SySTEM

5.1.3.1 Special requirements for open and half-open cooling systems:

Requirements
Impurities
Salt concentration
Algae and
myxobacteria
Organic materials
Table 24: Special requirements for open and semi-open cooling systems
NOTICE

5.1.4 connection to the cooling system

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The connection to the cooling system can occur as closed or open cooling circuit. The
connection to a closed cycle cooling circuit is recommended, because the danger of
contamination of coolant is very small. Preferably also a monitoring of the pH value of
the coolant should be installed. Pay attention to a corresponding cable cross section at
required equipotential bonding in order to avoid electro-chemical procedures.

5.1.5 coolant temperature and moisture condensation

The inlet temperature may not exceed 40 °C. The maximum heat sink temperature is
60 °C or 80 °C depending on the power unit and overload capacity. To ensure a safe
operation the coolant output temperature must be 10 K below this temperature.
Due to high air humidity and high temperatures it can lead to moisture condensation.
Moisture condensation is dangerous for the drive converter, because the drive converter
can be destroyed through eventual occuring short-circuits.
NOTICE
The following dew point table is used to determine the permissible temperature differ-
ences. The table shows the coolant inlet temperature depending on ambient tempera-
ture and air humidity.
66
Description
Mechanical impurities in half-open cooling systems can be counteracted when ap-
propriate water filters are used.
The salt content can increase through evaporation at half-open systems. Thus
the water is more corrosive. Adding of fresh water and removing of process water
works against.
Algae and myxobacteria can arise caused by increased water temperature and
contact with atmospheric oxygen. The algae and myxobacteria clog the filters and
obstruct the water-flow. Biocide containing additives can avoid this. Especially at
longer off periods of the cooling circuit preventive maintenance is necessary.
The contamination with organic materials must be kept as small as possible, be-
cause separate slime can be caused by this.
Loss of the warranty claims
Damages at the unit which are caused by clogged, corroded heat sinks
or other obvious operating errors, leads to the loss of the warranty claims.
Screw in connecting duct in accordance with the manual.
The connection to the coolant must be carried out with flexible, pressure-resistant
hoses and secured with clamps.
Pay attention to flux direction and check tightness !
The cooling flow must always be started before starting the KEB COMBIVERT.
Destruction of the drive converter by short circuit !
The user must guarantee that any moisture condensation is avoided !