H1F Open Circuit Requirements - Danfoss H1F 080 Service Manual

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 080
Technical specifications

H1F Open circuit requirements

12 | © Danfoss | December 2023
For open circuit applications it is not allowed to operate above rated speed. For closed circuit
applications operating between rated and max. speed, please contact your local Danfoss Power Solutions
representative.
H1 bent axis motors may be used in Open Circuit (OC) applications.
Since loop flushing is typically not used in OC-applications it is essential to provide sufficient cooling
capacity. This can be done by motor case cross flushing. The flow rate needs to be adjusted to the cooling
demand.
The highest case drain outlet port must always be used for the return flow to the cooler or tank.
The motor case and the working lines connected to Port A and B must be kept full of oil at all times,
whether in a dynamic or static condition.
The plumbing must not allow the oil to drain down and be replaced with air in the rotating group.
The minimum pressure in the inlet port and the outlet port, must be equal or higher as shown in the
tables.H1F Required inlet pressure table (for cylinder block filling)
Counter balance valves may be used to maintain the minimum pressure requirements. Danfoss meter-in /
meter-out PVG technology may be used. Check valves and sufficient charge pressure supply are also
possible.
At no time shall the motor be allowed to operate above the rated speed limits. If flow limiter valves are
used, they must be selected accordingly. This ensures proper function under all conditions.
Valve blocks, such as counter balance valves attached to the inlet and/or outlet ports, must not interfere
with any part of the motor. A review of the outline drawings or appropriate 3D models must be
completed.
on page 11 .
AX465363259664en-000102