Siemens SIMOTICS M-1PH8 - Page 79

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Figure4-6 Pressure drop in the cooling pipe system, shaft height 280
Note
Ensuring adequate cooling
To ensure adequate cooling, comply with the minimum 󹪞ow rates speci󹪝ed under Point "Cooling
data and sound pressure levels".
Pressure equalization
If various components are connected up in the cooling circuit, it may be necessary to provide
pressure equalization.
Note
Arrangement of the reactor element
Flow restrictors must be mounted on the cooling water outlet of the motor or the relevant
component!
Avoiding cavitation
During uninterrupted duty, the pressure drop across a converter or motor must not exceed
0.2MPa (2bar). Otherwise, the high 󹪞ow rate results in damage due to cavitation and/or
abrasion.
Connecting motors in series
For the following reasons, Siemens only conditionally recommends connecting motors in series:
• The required 󹪞ow rates of the motors must be approximately the same (<afactorof2)
• An increase in the cooling water temperature can result in having to derate the second or
third motor if the maximum cooling water inlet temperature is exceeded.
Mechanical properties
4.1Cooling
1PH8 SIMOTICS M main motors
Con󹪝guration Manual, 12/2022, A5E51895839A 77