Siemens S120 General requirements placed on the cooling medium, Requirements placed on the water

Motor components of the built-in motor and options 3.3 Cooling

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 μm.

Requirements placed on the water

The water used as the basis of the cooling medium must fulfill the following minimum requirements:

●Concentration of chloride: c < 100 mg/l

●Concentration of sulfate: c < 100 mg/l

●6.5 ≤ pH value ≤ 9.5

Please check further requirements with the manufacturer of the anti-corrosion agent!

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!

Suitable mixture

●25 % - 30 % ethylene glycol (= ethanediol)

●The water used contains a maximum of 2 g/l dissolved mineral salt and is largely free from nitrates and phosphates

Manufacturer recommendations: see appendix

1FW6 Built-in torque motors	53
Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3