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Mechanical properties of the motors
3.1 Cooling
3.1.2
Special information about liquid cooling
Notes on water cooling:
NOTICE
The heatsink material is not resistant to seawater. It is not permissible to directly cool the
motors using seawater.
NOTICE
Non-ferrous metals (e.g. copper, zinc or brass pipes) should not be used in water cooling
systems due to the formation of electrolytes. In combination with the motor materials, there
is the danger of corrosion.
NOTICE
If frost can be expected while the system is non-operational, is being transported or is in
storage, then a commercially available anti-freeze must be added.
Note
As a general rule, an anti-corrosion additive must be added to the cooling water. Different
anti-corrosion agents should not be mixed.
The cooling water should fulfill the following prerequisites: Chemically neutral, and free of
solids (tap water) For additional requirements, refer to the following table.
Table 3-4
Contents and chemical composition
pH value
Chloride ions
Sulfate ions
Nitrate ions
Dissolved solids
Total hardness
Conductivity
Size of any particles in the coolant
38
Chemical requirements of the coolant
Value
6.0 to 8.0
< 40 ppm
< 50 ppm
< 50 ppm
< 340 ppm
< 170 ppm
< 500 μS/cm
< 0.1 mm
1PM6/1PM4 Hollow-Shaft Motors for Main Spindle Drives
Configuration Manual, PPMS, 04/2008, 6SN1197-0AD23-0BP0
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