Siemens SIMOTICS M-1PH8 - Page 74

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.










1 Filter
1)
6 Temperature measurement
cooling water
2 Flow meter
1)
7 Compressor / cooling unit
3 Pressure relief valve, setting valve 󹪞ow rate
1)
8 Cooling unit
4 Pump 9 Motor
5 Cooling water tank  
1)
These components are not absolutely necessary.
Figure4-1 Example of a semi-open cooling circuit
Equipotential bonding
Provide all components in the cooling system (motor, heat exchanger, piping system, pump,
pressure equalization tank, etc.) with equipotential bonding. Implement the equipotential
bonding using a copper rail or 󹪝nely stranded copper cable with the appropriate conductor cross-
sections.
Note
Installation of the cooling water pipes
Electrically conductive cooling water pipes must not come into contact with live components.
• Ensure adequate insulation.
• Securely fasten the pipe.
Mechanical properties
4.1Cooling
1PH8 SIMOTICS M main motors
72 Con󹪝guration Manual, 12/2022, A5E51895839A