Product Description:

The EEA-PAM-523-D-32 is a plug-in power amplifier card developed by Vickers within the EEA-PAM Power Amplifiers series. Installed next to electrohydraulic proportional valves, it converts low-level command signals into regulated coil current for precise spool positioning. By centralizing signal conditioning, current limiting, and fault indication, the board streamlines closed-loop pressure, flow, and directional control tasks in industrial automation.

The card operates from a nominal supply of 24 VDC, delivering up to 1.6 A of solenoid current so the valve receives full actuation without external boosters. Its analog monitor and drive stages expect a load impedance of 10 kΩ, aligning with typical panel meters or PLC analog inputs. Voltage-mode commands see an input impedance of 47 kΩ, while current-mode references meet 100 Ω, minimizing loading on upstream controllers. A dedicated feed-forward path is buffered by 6 kΩ of impedance to accommodate velocity or pressure pre-compensation signals. Additional circuits include a 10 kΩ ramp generator port for adjustable slew rates, a 1 MΩ sensor feedback input that keeps transducer loading negligible, and a monitor point that scales at 1 V per ampere to display coil current on standard meters.

A stabilized auxiliary rail of +15 V is available for external signal conditioners, and the board supplies reference voltages of +10 V and -10 V at 5 mA each for potentiometer or joystick set-point circuits. Digital gating inputs draw only 10 mA, while the complementary transistor output can sink 100 mA to drive relays or status lamps. The alarm terminal sources up to 50 mA through 50 Ω resistance, signaling undervoltage or output stage faults to a supervisory PLC. Command linearity is preserved by the ramp network, and the isolated voltage, current, and feed-forward paths reduce external noise, enabling dependable proportional valve control in press, molding, and motion platforms.