Two Independent Controls
with Differential Pressure Settings
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With two independent hydraulic circuits, these power units are ideal for horizontal machining centers with two pallets that sometimes must operate at different pressures.
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Connection examples for two fixtures with single-acting clamps (Single-Acting Controls)
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7500 and 5000 psi max
Single and Double Acting
FEATURES: Electric Powers Units are the best power source for most workholding applications, complete with all electrical and hydraulic controls. Quiet, long-life radial piston pump powered by a totally enclosed fan-cooled universal motor. Large reservoir provides enough fluid capacity for virtually any fixture. Leak-free poppet valves and fittings.
TWO INDEPENDENT CONTROLS WITH DIFFERENTIAL PRESSURE SETTINGS: The configuration shown here has two remote pushbutton clamping switches, for two independent hydraulic circuits. The second circuit can be set to a lower pressure via an integral poppet-type Pressure Reducing Valve. This option is ideal for machining centers with shuttle pallets that sometimes must operate at different pressures. The single-acting version has two solenoidoperated clamping valves, to provide two independent clamping-pressure ports "A" and a return port "R" (return port is required when separate clamping valves are used to clamp multiple parts independently – leave the pushbutton switch in clamped position so that the "A" port supplies constant pressure). The doubleacting version has four solenoid-operated clamping valves, providing two independent clamping pressure ports "A", two independent unclamping-pressure ports "B", and a return port "R".
MODELS AVAILABLE: Choice of several different power supplies and maximum operating pressures, with either single-acting or doubleacting controls — see Dimensions page for part numbers:| | 7500 psi, 460 Volts, 3 Phase | | | 7500 psi, 230 Volts, 3 Phase | | | 5000 psi, 460 Volts, 3 Phase | | | 5000 psi, 230 Volts, 3 Phase | | | 5000 psi, 230 Volts, 1 Phase | | | 5000 psi, 115 Volts, 1 Phase |
OPERATION: The heart of this unit is a precision, long-life radial-piston pump controlled upon demand by an integral pressure switch. This switch is infinitely adjustable from the minimum to the maximum operating pressure. Automatic pressure control is assured, because the pump restarts if pressure drops. Clamping pressure is assured even with an electrical power failure since the solenoid valves are mechanically held in "clamped" position, requiring power only to unclamp. The poppet design of these valves ensures positive, leak-free sealing.
MOUNTING & SETUP: Mount power unit upright, preferably above fixture level to keep the unit clean. We offer a sturdy, attractive Power-Unit Stand (CLR-3532-168-PUA) that bolts to the floor. Power units can also be mounted on the machine tool using an angle bracket. Connect to a fused electrical supply and fill with clean, approved Hydraulic Fluid. Do not use NPT fittings for hydraulic connections.
SAFETY FEATURES: Fail-safe operation in case of electrical-power failure since the solenoidoperated clamping valves are de-energized in "clamped" position. These valves are poppet type, so they provide tight zero-leakage sealing. Pump motor has a thermal-overload relay with manual reset.
DUTY CYCLE: Electric Power Units are designed specifically and purely for workholding, with intermittent clamping and unclamping between machining cycles (not continuous running). For most workholding applications, actual running time is a small percentage of total cycle time. Run time must be less than 40% of total cycle time at maximum fluid level (25% at minimum fluid level). Run time must also be less than 120 continuous seconds at maximum fluid level (15 seconds at minimum fluid level). Otherwise the fluid will overheat and the unit will shut off automatically. |
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