Siemens SIMOTICS T-1FW68, Configuration Manual

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Mechanical properties
3.1 Cooling
1FW68 radial segment motors
Configuration Manual, 08/2021, A5E51132930B AA
55
Reason for the use of water with an anti-corrosion agent
The use of untreated water may lead to considerable damage and malfunctions due to
water hardness deposits, the formation of algae and slime, as well as corrosion, for
example:
• Worsening of the heat transfer
• Higher pressure losses due to reductions in cross-sectional area
• Blockage of nozzles, valves, heat exchangers and cooling ducts
General requirements placed on the cooling medium
The cooling medium must be pre-cleaned or filtered in order to prevent the cooling
circuit from becoming blocked. The formation of ice is not permitted!
Note
The maximum permissible size for particles in the cooling medium is 100 μ m.
Before using oil as the coolant, check the material compatibility.
Requirements placed on the water
Water which is used as basis for the coolant must comply as a minimum with the
following requirements:
• Chloride concentration: c < 100 mg/l
• Sulfate concentration: c < 100 mg/l
• 6.5 ≤ pH value ≤ 9.5
Contact the anti-corrosion agent manufacturer relating to additional requirements!
Requirements placed on the anti-corrosion agent
The anti-corrosion agent must fulfill the following requirements:
• The basis is ethylene glycol (also called ethanediol)
• The water and anti-corrosion agent do not segregate
• The freezing point of the water used is reduced to at least -5 ° C
• The anti-corrosion agent used must be compatible with the fittings and cooling
system hoses used as well as the materials of the motor cooler
Check these requirements, especially in regard to material compatibility, with the cooling
unit manufacturer and the manufacturer of the anti-corrosion agent!