Mechanical properties of the motors
3.2 Liquid cooling
1FT7 Synchronous Motors
52
Configuration Manual, (PFT7S) 01/2009, 6SN1197-0AD13-0BP2
3.2
Liquid cooling
WARNING
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
Description of the various cooling circuits
Definition
Description
Closed cooling circuit
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.
Semi-open cooling circuit Oxygen can only enter the cooling system through the pressure
equalization tank, otherwise the same as "closed cooling circuit".
Open cooling circuit
(tower system)
The coolant is cooled in a tower. In this case, there is intensive oxygen
contact.
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.
Summary of Contents for 1FT7 Series
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