Mechanical Properties Of The Motors; Cooling - Siemens SINAMICS S120 Configuration Manual

Mechanical properties of the motors

3.1

Cooling

An extremely high power density is achieved with water-cooled motors.
The cooling duct geometry is designed to achieve optimum dissipation of the stator power
losses and part of the rotor losses.
Water cooling with a cooling system is required for operation.
Coolants
Water or low-viscosity oils can be used as coolants (carefully observe any derating required).
The coolant should fulfill the following prerequisites: Water which is chemically neutral and
free of solids (tap water). For additional requirements, refer to the following table.
Table 3- 1
Contents and chemical composition
pH value
Chloride ions
Sulfate ions
Nitrate ions
Dissolved solids
Total hardness
Electrical conductivity
Size of any particles in the coolant
Additives must be mixed with the cooling water in appropriate quantities to protect against
corrosion and the growth of algae. The type and quantity of additive should be taken from
the manufacturer's specifications for these additives (refer to table) and the particular
ambient conditions.
If Tyfocor (Tyforop Chemie GmbH) or Antifrogen N (Clariant Produkte GmbH Deutschland) is
used, for example, 75% water and 25% anti-corrosion agent should be used.
1PH4 Induction Motors
Configuration Manual, (APH4S), 08/2008, 6SN1197-0AD64-0BP1
Chemical requirements placed on the coolant
Value
6.0 to 8.0
< 40 ppm
< 50 ppm
< 50 ppm
< 340 ppm
< 170 ppm
< 500 μS/cm
max. 100 μm
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