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Bbc designguide C CConstruction and Operation Speed of rotation All tables of model speci ?cations refer to normal rotational speeds If motor application requires speeds di ?erent from those mentioned please consult motor manufacturer or its representativ

C CConstruction and Operation Speed of rotation All tables of model speci ?cations refer to normal rotational speeds If motor application requires speeds di ?erent from those mentioned please consult motor manufacturer or its representative A check valve with an opening pressure of bar psi in the drain line regulates the pressure in the case Limitation of pressure peaks in the case is accomplished by dimensioning the return lines and check valves to correspond with the maximum intended speed of the motors at the moment of engaging disengaging Charge pressure The minimum pressure required at the motor's inlet port is called the charge pressure It is needed to guarantee continuous contact between the cam ring and the cam rollers especially in applications where an external force rotates the motor For each motor size the charge pressure depends on the actual speed and case pressure The performance curves show the charge pressure ?gure at minimum back pressure and with no casing pressure With hydrostatic braking the charge pressure must be increased ?? bar ?? psi Simultaneously su ?cient oil supply to the motor inlet port has to be assured Especially for open circuits during hydrostatic braking using a relief valve be sure to compensate for the drain ow and the ushing of heated oil Back pressure In applications where the pressure in the return line is too low compared to the case pressure and actual speed the motor may make extraneous noise in service This is caused by the inertial force of the piston and the fact that the pistons and cam rollers tend to lose contact with the cam ring This problem can be eliminated by increasing pressure in the return line as high as required charge pressure at current speed which guarantees continuous contact between the cam ring and cam rollers This back pressure must not be present at the motor ports during freewheeling Case pressure The recommended case pressure for standard motors is ?? bar ?? psi The maximum intermittent pressure is bar psi If the motor is not rotating a static case pressure up to bar psi is allowed Requirements for charge and back pressure increase if the case pressure rises For freewheeling case ?lling and for regulating the case pressure a check valve with ?? bar ?? psi opening pressure is usually placed in the drain line If freewheeling is never used and the motor is below the level of oil in the tank the drain line is connected directly to the tank Freewheeling To disengage the motor both working lines i e inlet line and return line are to be connected directly to the tank To ensure that the lines are completely without pressure they should not be connected together with lines from other hydraulic circuits if this can lead to pressure disturbances nor should any components causing pressure peaks or increases be connected to them In order to produce the freewheeling pressure in the case a uid must be supplied to the motor through