Connection To The Cooling System; Coolant Temperature And Moisture Condensation - KEB COMBIVERT F5 Series Instruction Manual

Impurities
Salt concentration
Algae and myxo-
bacteria
Organic materials
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.
• 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 contaminati-
on 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 90 °C
depending on the power unit and overload capacity (see „technical data"). 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. Moistu-
re 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.
Mechanical impurities in half-open cooling systems can be counterac-
ted when appropriate water filters are used.
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 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 cooling
circuit preventive maintenance is necessary.
The contamination with organic materials must be kept as small as
possible, because separate slime can be caused by this
Annex
GB - 39