Special requirements for open and half-open cooling systems:
Impurities
Mechanical impurities in half-open cooling systems can be
counteracted when appropriate water filters are used.
Salt concentration
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 myxobacte-
ria
Algae and myxobacteria can arise caused by increased wa-
ter temperature and contact with atmospheric oxygen. The
algae and myxobacteria clog the filters and obstruct the wa
-
ter-flow. Biocide containing additives can avoid this. Espe
-
cially at longer OFF periods of the cooling 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.
NOTICE
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.
10.1.4 Coolant temperature
The flow temperature may not exceed 40°C. The maximum overheat temperature is
60°C or 90°C depending on the power unit and overload capacity. The coolant temper-
ature is specified in the technical data.
The flow temperature should be chosen depending on the volume flow, so
that at rated operation the heatsink temperature is always 10K below the
overheat temperature level. As a result, a sporadic shutdown is avoided.
10.1.4.1 Moisture condensation
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 user must guarantee that any moisture condensation is avoided!
10.1.4.2 Supply of temper coolant
This is possible by using heatings in the cooling circuit for the control of the coolant tem-
perature. The following dew point table is available for this:
64
COOLING SySTEM
Summary of Contents for COMBIVERT F5 Series
Page 2: ......
