Product Description:

The EEA-PAM-525-D-32 is a plug-in power amplifier card manufactured by Vickers for the EEA-PAM Power Amplifiers series. Installed in hydraulic control racks, the card converts low-level electrical references from a PLC or analog loop into proportional solenoid current so that directional or pressure valves follow commanded flow or force profiles in automated machinery. By integrating signal conditioning, ramp generation, PID control, and alarm functions on one board, the module simplifies panel wiring and preserves response consistency.

The board operates from a nominal supply of 24 VDC, while its internal regulator distributes a stabilized output of +15 V for external sensors or potentiometers. Alarm circuitry can sink up to 50 mA, and the fault line is limited by an alarm output resistance of 50 Ω so downstream indicators are protected against short circuits. Command accuracy depends on signal loading: the voltage command input presents 47 kΩ, the separate current command path shows 100 Ω, and the feed-forward node offers a moderate 6 kΩ impedance that permits velocity-type pre-control without upsetting the main loop. Reference output current is fixed at 5 mA to bias potentiometric setpoints, and the ramp generator accepts sources that see 10 kΩ.

Feedback and diagnostic links are arranged to avoid loading sensitive circuits. The monitor point is buffered by a 10 kΩ impedance so oscilloscopes or panel meters do not affect loop tuning, and the PID stage will drive loads of 10 kΩ without saturation. A ramp-active indicator shares the same 10 kΩ resistance value to keep LED current predictable. Sensor channels are split: the current input is matched to 100 Ω, while the voltage input reaches 1 MΩ to minimize leakage from bridge transducers. Digital outputs can supply up to 100 mA for relays or lamps provided the connected device exceeds the required pull-up resistance of 5 kΩ. Together these limits define the permissible cabling lengths and ensure stable electrohydraulic actuation.