10 Cooling System
10.1 Installation of liquid-cooled devices
In continuous operation liquid-cooled drive converters are operated with lower tempera-
ture than air-cooled inverters. This has positive effects on lifetime-relevant components
such as fan and DC link capacitors and power modules (IGBT). Also the temperature de-
pendent switching losses are positively effected. The use of liquid-cooled COMBIVERT
drive converters is offered in the drive technology, because there are process-caused
coolants available with some applications.
10.1.1 Heat sink and operating pressure
Design system
Material (voltages)
Max. operating
pressure
Connecting duct
Extrusion casting heat sink
Aluminium (-1.67 V)
10 bar
0000650-G140
Cooling plate with
pressed pipes
Stainless steel (-1.04V)
6 bar
upon request
Table 21: Heat sink and operating pressure
The aluminium liquid coolers are sealed by sealing rings and posses a surface protec-
tion (anodized) even in the ducts.
NOTICE
In order to avoid a deformation of the heat sink and the damages there-
by, the indicated max. operating pressure may not be exceeded briefly
also by pressure peaks.
Pay attention to the Directive 2014/68/EU of pressure equipment.
10.1.2 Materials in the cooling cicuit
For the screw connections and also for the metallic articles in the cooling circuit which
are in contact with the coolant (electrolyte) a material is to be selected, which forms a
small voltage difference to the heat sink in order to avoid contact corrosion and/or pitting
corrosion (electrochemical series, see table). An aluminum screw connection or ZnNi
coated steel screw connection is recommended. Other materials must be examined in
each case before employment. The specific case of application must be checked by the
customer in tuning of the complete cooling circuit and must be classified according to the
used materials. With hoses and seals take care that halogen-free materials are used.
A liability for occuring damages by wrongly used materials and from this resulting corro-
sion cannot be taken over!
62
COOLING SySTEM
Summary of Contents for COMBIVERT F5 Series
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