Continuously Connected Systems
System Considerations
When using a continuously connected hydraulic system you must consider how the power unit will maintain pressure. Two approaches are commonly used. On systems where the machining cycle is short, it is common to keep the power unit running continuously, periodically shifting a directional control valve as needed to maintain pressure. This prevents unnecessary wear on the motor starter. On systems with longer machining cycles the hydraulic power unit can be turned on and off as need to maintain pressure. In either case it is necessary to incorporate a pressure monitoring device, such as a pressure switch, with necessary outputs to control either the valve or the pump motor. In more complicated systems, additional pressure and proximity sensors can be incorporated to increase automation of the circuit. Enerpac offers an “auto on/off” feature on several workholding electric power units. For longer machining cycles, these pumps can be ordered with a porting block and pressure transducer. They are set to turn the motor on when a preset “low” pressure is reached, and off when a preset “high” pressure is reached. For shorter machining cycles, the power unit can be ordered with an electric valve and pressure transducer. In this configuration, the pump motor runs continuously and the valve shifts to build pressure when the “low” setting is reached. When a preset “high” pressure is reached, the valve turns off.
Please contact Enerpac for additional assistance in configuring a continuously connected system.
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