Siemens SIMOTICS-T 1FW68, Engineering Manual

Page: 52 / 180

Mechanical properties
3.1 Cooling
1FW68 radial segment motors
52
Configuration Manual, 04/2017, 6SN1197-0AE02-0BP1
If you cannot determine the actual rms power loss P
V
then alternatively you can add the
rated power losses P
V,N
of all the stator segments to be used. The rated power losses P
V,N
of
the stator segments are listed in the data sheets. Dimension the cooling system based on
the sum of the rated power losses determined P
V,N
.
If the sum of the rated power losses P
V,N
is greater than the actual rms power loss P
V
, then
this will lead to an overdimensioning of the cooling system.
The cooling system must be sufficiently powerful to ensure the required coolant pressure
even at the maximum volume flow rate.
3.1.2 Coolant
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
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.