| 摘要 |
<p>A pressure source (22) for a pressure device comprises a pump (P) for pumping a fluid from fluid tank (T), an accumulator (AC) connected to the pump (P) and a pressure device, a pressure detecting means (S1) for detecting the pressure in the accumulator (AC), and a controller (C1) for controlling the operation of the pump (P) in an ON-OFF manner on the basis of a result of detection by the pressure detecting means (S1). In this pressure source (22), the controller (C1) includes first and second drive signal generating circuits (251,252) each capable of indepedently generating a drive signal for determining the on-off operation of the pump (P), and a processing circuit (26) which has a calculating function therein and to which at least the pressure detecting means (S1) is connected. The processing circuit (26) is connected to the first drive signal generating circuit (251), and the pressure detecting means (S1) is connected to the second drive signal generating cirucit (252). This ensures that the control of the first drive signal generating circuit (251) can be carried out at any time by a calculation in the processing circuit (26), leading to an increased function. When the processing circuit (26) has a problem, the on-off control of the pump can be carried out by the second drive signal generating circuit (252). <IMAGE></p> |
