Mechanical properties
3.1 Cooling
1FW3 complete torque motors
Configuration Manual, 08/2020, A5E46027705B AA
41
3.1.2
Pressure conditions in the cooling circuit
Consider the following pressure conditions when designing the cooling circuit.
Permissible pressure
●
Define the working pressure based on the flow conditions in the supply and return pipes
of the cooling circuit.
The maximum permitted pressure in the cooling circuit is 0.6 MPa (6 bar).
Note
If you use a pump that reaches a higher pressure, maintain a maximum pressure of 0.6 MPa
by taking appropriate measures (pressure relief valve, pressure control, etc.).
●
Design the cooling circuit to have the smallest possible pressure difference between the
supply and return pipes so that pumps with a shallow characteristic curve can be used.
●
Design the cooling circuit with a self-cleaning filter to avoid blockage and corrosion.
Pressure equalization
If various components are connected up in the cooling circuit, it may be necessary to provide
pressure equalization.
Note
Throttle elements
•
You must install throttle elements at 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 flow rate results in damage due to cavitation and/or
abrasion.
Connecting motors in series
For the following reasons, connecting motors in series can be recommended only
conditionally:
●
The required flow 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.
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