Siemens SIMOTICS GP Compact Operating Instructions page 114

Drive with TRASMITAL MG orbital hydraulic motor
In addition to the instructions governing installation of the gear unit, the foliowing instructions should also be
observed when installing a hydraulic motor.
a) Connecting to the hydraulic circuit
The motor can be installed on both a closed and open loop circuit.
In the case of an open circuit installation, the solenoid valve or control valve may be of either the closed cen-
tre or open type.
The circuit line corresponding to the hydraulic motor delivery port must always be equipped with a pressure
relief valve calibrated to a pressure no greater than the motor's pmax. Refer to the hydraulic circuit diagrams
below.
Closed loop circuit Open loop circuit
RV
RV
RV
=
pressure relief valves calibrated to pRV < pmax.
Closed centre control valve
I
T
I " " '
.
.
,o;,
B
Open centre control valve
lf this is not possible because the circuit must also actuate ether equipment at a higher pressure, or the con-
trol valve is of the closed centre type and the motor drives components with high inertia, auxiliary pressure
relief valves must be installed as close as possible to the motor.
T
A
'O'
...
,
..
4
B
RV
RV
=
pressure relief valves calibrated to pRV < pmax.
@Bonfiglioli
Trasmital
25