Siemens S120 configurationmanual Coolant, Provision of the cooling medium

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

During continuous operation, the motor can only be loaded to the extent that the effective continuous torque Meff does not exceed the rated torque MN. As a result, therefore, the effective power loss cannot exceed the rated power loss PV,N.

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⎜ HII ⎟

If the actual effective loss is impossible to predict or too complex to calculate, the total combined continuous power loss (table values) of all the motors deployed can be used instead to calculate the required cooling power.

In this case, the resulting discrepancy vis-à-vis the actual effective power loss may mean that the cooling system is overdimensioned.

The cooling system must be sufficiently powerful to ensure the required coolant pressure even at the maximum volume flow rate.

3.3.2Coolant

Provision of the cooling medium

The customer must provide the cooling medium. Only water with anti-corrosion agent should be used as the cooling medium.

WARNING

Oil must not be used as a coolant because it is incompatible with materials used in motors with a cooling jacket and may cause O-rings to corrode. In motors with integrated cooling, oil can corrode the hoses of the cooling system inside the motor.

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

For this reason, water as a cooling medium must contain an anti-corrosion agent that reliably prevents deposits and corrosion even under extreme conditions.

52	1FW6 Built-in torque motors
	Configuration Manual, 05/2009, 6SN1197-0AE00-0BP3