Annex - Cooling System; General Information; Materials In The Cooling Cicuit; Table 11: Electro-Chemical Voltage Series - KEB COMBIVERT F5 Instructions For Use Manual

ANNEx - cOOLING SYSTEM

c Annex - cooling System
c.1 General information
Since a liquid cooling is used for the cabinet system, the used components can be oper-
ated significantly cooler in continuous operation than in air-cooled cabinet systems. This
has positive effects on the lifetime of components such as fans, DC link capacitors and
power modules (IGBT). Also the temperature dependent switching losses are positively
effected. For applications with process-related coolants the use of water-cooled cabinet
systems is recommended.
ATTENTION
c.1.1 Materials in the cooling cicuit
For all metallic elements which are in contact with the cooling liquid (electrolyte) in the
cooling circuit, select a material which forms a small voltage difference to the heat sink
(see electrochemical voltage series). This prevents the formation of contact corrosion
and / or pitting.
Electro-chemical voltage series / standard potentials against hydrogen
Material Generated Ion
Lithium Li
Potassium K
Calcium Ca
Sodium Na
Magnesium Mg
Titan Ti
Aluminium Al
Manganese Mn
Zinc Zn
Chrome Cr
Iron Fe
Cadmium Cd
Cobald Co
Table 11: Electro-chemical voltage series
Observe maximum operating pressure.
► In order to avoid a deformation of the used components and the
damages thereby, the indicated max. operating pressure may not be
exceeded briefly also by pressure peaks.
► Pay attention to the guidelines 97/23/EG of pressure units.
Standard poten-
tial
-3.04 V
+
-2.93 V
+
-2.87 V
2+
-2.71 V
+
-2.38 V
2+
-1.75 V
2+
-1.67 V
3+
-1.05 V
2+
-0.76 V
2+
-0.71 V
3+
-0.44 V
2+
-0.40 V
2+
-0.28 V
2+
We recommend the use of stainless steel or nickel plated brass cable glands.
Material Generated Ion
Nickel Ni
Tin Sn
Lead Pb
Iron Fe
Hydrogen 2H
Stainless steel diverse
Copper Cu
Carbon C
2+
Silver Ag
Platinum Pt
Gold Au
Gold Au
Standard poten-
tial
-0.25 V
2+
-0.14 V
2+
-0.13 V
3+
-0.037 V
3+
0.00 V
+
0.2...0.4 V
0.34 V
2+
0.74 V
0.80 V
+
1.20 V
2+
1.42 V
3+
1.69 V
+
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