Requirements For Open And Half-Open Cooling Systems; Coolant Temperature; Moisture Condensation; Table 17: Requirements For Open And Half-Open Cooling Systems - KEB COMBIVERT F5 Instructions For Use Manual

OPerATION OF LIqUID-cOOLeD DeVIceS

5.1.5 requirements for open and half-open cooling systems

requirement
Impurities
Salt concentration
Algae and myxobacteria
Organic materials
Table 17: Requirements for open and half-open cooling systems
ATTENTION

5.1.6 coolant temperature

•
•
•
•

5.1.7 Moisture condensation

High air humidity and high temperatures can lead to moisture condensation. Moisture
condensation is considered to be a threat to the drive converter. The drive converter can
be destroyed by any short-circuits that may occur.
ATTENTION
Measure
Mechanical impurities in half-open cooling systems can be counteracted
when appropriate 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 coolant-flow. Biocide containing additives can avoid
this. Especially at longer OFF periods of the cooling circuit preventive main-
tenance is necessary.
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 obvious operating errors, leads to the loss of the warranty
claims.
The flow temperature may not exceed 40 °C.
The maximum overheat temperature is 60 °C, 73 °C or 90 °C depending on the
power unit and overload capacity.
The coolant temperature is specified in the technical data.
Higher flow temperatures only after consultation with KEB.
The flow temperature should be chosen depending on the volume flow, so that
at rated operating the heatsink temperature is always 10 K below the overheat
temperature level. As a result, a sporadic shutdown is avoided.
The user must guarantee that any moisture condensation is avoided!
57