75
WATer-cOOLeD DeVIceS
5 Installation and Operation of Liquid-cooled Devices
5.1 Water-cooled devices
The use of water-cooled KEB COMBIVERT drive controllers is offered, because there
are process-caused coolants available with some applications. However, the following
instructions must be observed.
5.1.1 Heat sink and operating pressure
Design system
Material
max. operating pres-
sure
connection
Aluminium heat sink with
stainless steel tubes
Stainless steel 1.4404
10 bar
NOTICE
Deformation of the heat sink!
►
In order to avoid a deformation of the heat sink and the damages
thereby, the indicated maximum operating pressure may not be
exceeded briefly also by pressure peaks.
►
The pressure equipment directive 2014/68/EU on pressure equip-
ment must be observed!
5.1.2 Materials in the cooling circuit
For the screw connections and also for the metallic articles in the cooling circuit which are in con-
tact with the coolant (electrolyte) a material is to be selected, which forms a small voltage differ
-
ence to the heat sink in order to avoid contact corrosion and/or pitting corrosion (electro-chemical
voltage series, see the following table). 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!
Material
formed ion
Standard poten-
tial
Material
formed ion
Standard poten-
tial
Lithium
Li+
-3.04 V
Nickel
Ni2+
-0.25 V
Potassium
K+
-2.93 V
Tin
Sn2+
-0.14 V
Calcium
Ca2+
-2.87 V
Lead
Pb3+
-0.13 V
Sodium
Na+
-2.71 V
Iron
Fe3+
-0.037 V
Magnesium
Mg2+
-2.38 V
Hydrogen
2H+
0.00 V
Titan
Ti2+
-1.75 V
S t a i n l e s s
steel
various
0.2...0.4 V
Aluminium
Al3+
-1.67 V
Copper
Cu2+
0.34 V
Manganese
Mn2+
-1.05 V
Carbon
C2+
0.74 V
Zinc
Zn2+
-0.76 V
Silver
Ag+
0.80 V
continued on the next page
Содержание COMBIVERT F6 series
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