Bosch Rexroth MSK030B-0900-NN Project Planning Manual page 231

DOK-MOTOR*-MSK********-PR12-EN-P
Synchronous Servomotors MSK
Cooling circuits Generally, two different cooling circuits are used to cool the motors:
● closed cooling circuit (no penetration of oxygen possible)
● semi-open cooling circuit (oxygen can only enter the cooling system
through the pressure compensation vessel)
Open cooling systems with intensive oxygen contact are not al‐
lowed. Bosch Rexroth recommends to design the cooling circuits
as closed systems in order to minimize system-wide bacterial
growth.
The electrochemical processes occurring in the cooling system must be mini‐
mized by the selection of materials. Mixed installations, i.e. combinations of
different materials such as copper, brass, iron, zinc and halogenated plastics
(e.g. PVC hoses and seals) should be avoided.
Bosch Rexroth AG
Operating conditions and application notes
229/279