Liquid Cooling; Cooling Circuit - Siemens 1FT7 Configuration Manual

Mechanical properties of the motors

3.2 Liquid cooling

3.2 Liquid cooling
The equipment must be safely disconnected from the supply before any installation or
service work is carried out on cooling circuit components.
Only qualified personnel may design, install and commission the cooling circuit.
3.2.1

Cooling circuit

The electrochemical processes that take place in a cooling system must be minimized by
choosing the right materials. For this reason, mixed installations, i.e. a combination of
different materials, such as copper, brass, iron, or halogenated plastic (PVC hoses and
seals), should not be used or limited to the absolutely essential minimum.
A differentiation is made between 3 different cooling circuits:
● Closed cooling circuit
● Semi-open cooling circuit
● Open cooling circuit
Table 3- 1
Definition
Closed cooling circuit
Semi-open cooling circuit Oxygen can only enter the cooling system through the pressure
Open cooling circuit
(tower system)
Note
Cooling circuits
Only closed and semi-open cooling circuits are permissible for motors. Converter systems
must be connected before the motors in the cooling circuit.
52
WARNING
Description of the various cooling circuits
Description
The pressure equalizing tank is closed (oxygen cannot enter the system)
and has a pressure relief valve. The coolant is only routed in the motors
and converters as well as the components required to dissipate heat.
equalization tank, otherwise the same as "closed cooling circuit".
The coolant is cooled in a tower. In this case, there is intensive oxygen
contact.
Configuration Manual, (PFT7S) 01/2009, 6SN1197-0AD13-0BP2
1FT7 Synchronous Motors