Installation And Operation Of Water-Cooled Devices; Heat Sink And Operating Pressure; Materials In The Cooling Circuit; Table 26: Electro-Chemical Voltage Series / Standard Potentials Against Hydrogen - KEB COMBIVERT F6 Instructions For Use Manual

HeAT SINk AND OPerATING PreSSUre

5 Installation and Operation of Water-cooled Devices

The use of water-cooled KEB COMBIVERT drive converters is offered, because there
are process-caused coolants available with some applications. However, the following
instructions must be observed.
5.1 Heat sink and operating pressure
Design system
Aluminium heat sink with
stainless steel tubes
ATTENTION

5.2 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 generated Ion
Lithium Li+
Potassium K+
Calcium Ca2+
Sodium Na+
Magnesium Mg2+
Titan Ti2+
Aluminium Al3+
Manganese Mn2+
Zinc Zn2+
Chrome Cr3+
Iron Fe2+
Cadmium Cd2+
Cobald Co2+
Table 26: Electro-chemical voltage series / standard potentials against hydrogen
62
Material
Stainless steel 1.4404
Avoid 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.
► Observe the pressure equipment directive!
Standard potential Material
-3.04 V Nickel
-2.93 V Tin
-2.87 V Lead
-2.71 V Iron
-2.38 V Hydrogen
-1.75 V Stainless steel
-1.67 V Copper
-1.05 V Carbon
-0.76 V Silver
-0.71 V Platinum
-0.44 V Gold
-0.40 V Gold
-0.28 V
Max. operating
pressure
10 bar
generated Ion
Ni2+
Sn2+
Pb3+
Fe3+
2H+
various
Cu2+
C2+
Ag+
Pt2+
Au3+
Au+
connection
=> „Connection of the
cooling system"
Standard potential
-0.25 V
-0.14 V
-0.13 V
-0.037 V
0.00 V
0.2...0.4 V
0.34 V
0.74 V
0.80 V
1.20 V
1.42 V
1.69 V