Coolants - Siemens Simotics T-1FW6 Operating Instructions Manual

The following diagram shows the principle dependency of the relevant continuous motor
current on the intake temperature of the cooling water in the main cooler The rotor losses are
omitted as negligible.
Figure 2-5
2.5.3.2

Coolants

Provision of the coolant
The customer must provide the coolant. The motors are designed for use with an anti-
corrosion protection agent added to the water.
Note
Power derating when using oil as coolant
If you are using oil as coolant, then this can reduce the power loss dissipated by the cooler.
Appropriately reduce the motor power. Please contact your local Siemens office if you have
any questions.
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
1FW6 external rotor built-in torque motors
Operating Instructions, 12/2020, A5E49196960B AB
Influence of the coolant inlet temperature
Description
2.5 Design
41