GB - 44
Annex
Impurities
Mechanical impurities in half-open cooling systems can be counter-
acted when appropriate water filters are used.
Salt concentration
The salt content can increase through evaporation at half-open sys-
tems. Thus the water is more corrosive. Adding of fresh water and
removing of process water works against.
Algae and myxo-
bacteria
Algae and myxobacteria can arise caused by increased water tem-
perature and contact with atmospheric oxygen. The algae and myxo-
bacteria clog the filters and obstruct the water-flow. Biocide containing
additives can avoid this. Especially at longer OFF periods of the cool-
ing circuit preventive maintenance is necessary.
Organic materials
The contamination with organic materials must be kept as small as
possible, because separate slime can be caused by this
Damages at the unit which are caused by clogged, corroded heat sinks or other ob-
vious operating errors, leads to the loss of the warranty claims.
C.1.4 Connection to the cooling system
• 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.
• The valves must be installed in the flow pipe to keep the return flow pipe pressure free.
• Pay attention to flux direction and check tightness !
• The cooling flow must always be started before starting the KEB COMBIVERT.
The connection to the cooling system can occur as closed or open cooling circuit. The con-
nection to a closed cycle cooling circuit is recommended, because the danger of contamina-
tion 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.
C.1.5 Coolant temperature and moisture condensation
The inlet temperature may not exceed 40°C. The maximum heat sink temperature is 60 °C,
70 °C or 90 °C depending on the power unit and overload capacity (see „Technical data“). The
flow temperature should be selected depending on the volume flow by way that the heat sink
temperature is always 10K below the over-temperature level (OH) at rated operation. This
avoids sporadic shutdown.
Due to high air humidity and high temperatures it can lead to moisture condensation. Moisture
condensation is dangerous for the inverter, because the inverter can be destroyed through
eventual occuring short-circuits.
The user must guarantee that any moisture condensation is avoided!
In order to avoid a moisture condensation the following possibilities can be done. The appli-
cation of both methods is recommended.
Summary of Contents for COMBIVERT F6
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