Eaton Vickers EEA-PAM-523-A-32 Proportional Amplifier

The Eaton EEA-PAM-523-A-32 (also referenced as 02-326001) is a precision electronic amplifier module from the Vickers® product line, designed for use with proportional solenoid-operated directional and flow control valves. This power amplifier card accepts low-level analog command signals from PLCs, motion controllers, or potentiometers and converts them into a high-frequency pulse-width modulated (PWM) output current to drive the valve solenoids. The result is precise, repeatable control of hydraulic flow, pressure, and direction in industrial machinery.

Key Features

• Supply voltage: 24 VDC ±10% (regulated)

• Command signal input: ±10 VDC differential or 4-20 mA (selectable)

• Output type: PWM (pulse-width modulated) current up to 2.5 A per solenoid

• Adjustable ramp times for acceleration and deceleration (0.05 - 5 seconds)

• Dither frequency adjustment: 50 - 200 Hz to minimize valve hysteresis

• Enable/disable input with LED status indication

• Short-circuit and overload protection on outputs

• Compact Eurocard format (100 x 160 mm) with 32-pin DIN 41612 connector

• On-board potentiometers for independent adjustment of gain, ramp, and bias

• LED indicators for power, enable, and output status

Technical Specifications

Functional Description

The amplifier compares the command signal with an internal ramp generator to control the solenoid current. The PWM output reduces power dissipation in the amplifier and valve coils while providing fast response. Adjustable dither (a high-frequency AC component) keeps the valve spool in continuous micro-motion, overcoming static friction and improving hysteresis. The module includes separate adjustments for maximum and minimum current, allowing precise matching to the valve's characteristics.

Compatible Valves

This amplifier is optimized for Vickers proportional valves including series KDG, KSD, KFD, and KBS. It can also be used with other brands' proportional valves with similar electrical characteristics (solenoid resistance and inductance).

Applications

• Injection molding machines

• Presses and stamping equipment

• Material handling and lifting devices

• Test stands and flight simulators

• Mobile hydraulic systems (with appropriate packaging)

• Paper and steel processing lines

Installation and Configuration

The module plugs into a standard 19-inch rack with a backplane connector. All adjustments are made via multi-turn trim pots accessible through the front panel. LED indicators provide immediate visual feedback on power, command signal presence, and output status. Wiring to the valve solenoids should be shielded and kept separate from power cables to avoid noise pickup.

The Eaton EEA-PAM-523-A-32 offers the precision and reliability required for demanding hydraulic control applications, ensuring smooth and accurate machine motion.