Technical data

9-14 Notes Regarding Application Rexroth IndraDyn H
DOK-MOTOR*-MBS-H******-PR02-EN-P
n21
n21
pppp
Q... QQQ
∆=∆=∆=∆
++=
∆p: Pressure drop
Q: Flow quantity
Fig. 9-21: Pressure drop and flow quantity in the parallel connection of
hydraulic components
When several working components are cooled, a parallel connection is
advantageous for the following reasons:
• The individual components that are to be cooled can be cooled at the
individual required flow quantity. This means a high thermal
operational reliability.
• Same temperature level at the coolant entry of all components (equal
machine heating)
• Same pressure difference between coolant entry and outlet of all
components (no high overall pressure required)
J
1
Q, J
J
2
J
3
Dp
1
, DJ
1
Dp
2
, DJ
2
Dp
3
, DJ
3
Dp
J <
J
1
< J
2
< J
3
P
V1
P
V2
P
V3
Fig. 9-22: Series connection of liquid-cooled drive components
In series connections, the same coolant stream flows through all
components that are to be cooled. Each component has a pressure
drop between coolant inlet and coolant outlet. The individual pressure
drops add up to the overall pressure drop of the drive components.
Series connection does not permit any individual selection of the flow
quantity required for the individual components to be made. It is only
expedient if the individual components that are to be cooled need
approximately the same flow quantity and bring about only a small
pressure drop or if they are installed very far away from the heat removal
device.
n21
n21
p ... ppp
QQQQ
∆+∆+∆=∆
===
∆p: Pressure drop
Q: Flow quantity
Fig. 9-23: Pressure drop and flow quantity in the parallel connection of
hydraulic components
The following disadvantages of series connection must always be taken
into account:
• The required system pressure corresponds to the sum of all pressure
drops of the individual components. This means a reduced hydraulic
operational safety due to a high system pressure.
Series connection