ROEMHELD Electric Power Units (Standard)

ROEMHELD Power Workholding

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Product Information

ROEMHELD Electric Power Units (Standard)

7250 or 5000 psi max

For Single-Acting and Double-Acting Systems

Electric Power 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.

Choice of several different power supplies and maximum operating pressures, with either single-acting or double-acting valve function. The double-acting versions can also be used for single-acting systems.

7250 psi – 460 Volts, 3 Phase

7250 psi – 230 Volts, 3 Phase

5075 psi – 460 Volts, 3 Phase

5075 psi – 230 Volts, 3 Phase

5075 psi – 230 Volts, 1 Phase

5075 psi – 115 Volts, 1 Phase

Control Options

Standard Controls

The standard configuration shown here has one remote push-button clamping switch. The single-acting version has one solenoid-operated clamping valve, to provide one clamping-pressure port "A" and a return port "R" (return port is required when separate clamping valves are used to clamp multiple workpieces independently – leave the push-button switch in "clamped" position so that the "A" port supplies constant pressure). The double-acting version has two solenoid-operated clamping valves, providing one clamping pressure port "A", one unclamping-pressure port "B", and a return port "R".

Controls for Two Independent Circuits

The configuration shown here has two remote push-button clamping switches, for two independent hydraulic circuits. This option is ideal for machining centers with shuttle pallets. The single-acting version has two solenoid-operated 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 push-button switch in clamped position so that the "A" port supplies constant pressure). The double-acting 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".

Controls for Two Independent Circuits with Different Pressures

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 solenoid-operated 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 double-acting 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".

Controls for Manual Pallet Decoupling

No Valves or Controls

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. 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 solenoid-operated 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.