Product Description:

The EEA-PAM-525-C-32 is a plug-in power amplifier card manufactured by Vickers and supplied within the EEA-PAM Power Amplifiers series. The board converts low-level voltage or current reference signals into regulated drive power for proportional hydraulic valves, allowing automated machines to vary flow or pressure with closed-loop accuracy. Installed in a 19-inch control rack, the module forms the electrical interface between the motion controller and the solenoid stage of the valve, stabilizing servo performance in industrial automation cells.

Mechanical format is a 3U Eurocard that measures 100 mm in height and 175.24 mm in depth, so it shares mounting rails with other PLC and I/O cards. An on-board regulator furnishes a dedicated output of +15 VDC to power external electronics. The proportional stage is driven through a control loop that can source up to 5 mA while delivering symmetrical command levels of -10 VDC on pin B2 and +10 VDC on pin Z2. With a 47 kΩ voltage input impedance, standard analog sources are not loaded appreciably, and the 50 Ω alarm output lets supervisory hardware detect fault conditions without excessive current. All outputs are short-circuit protected, preventing card damage if field wiring is accidentally bridged.

Current-mode references enter the module through a 100 Ω input path that matches typical 4–20 mA transmitters. Field termination is achieved with a DIN 41612 F48 male connector, enabling straightforward card replacement during maintenance. For local trimming, an operator can select one of four preset pots; the external command potentiometer expects a resistance of 5 kΩ, whereas each internal preset pot is rated at 50 kΩ for fine scaling of gain, bias, and ramp. The separate 10 kΩ ramp-status output simplifies timing diagnostics by providing a proportional voltage that mirrors the programmed acceleration profile.

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