Product Description:

The EEA-PAM-533-D-33 is a plug-in power amplifier card produced by Vickers within the EEA-PAM Power Amplifiers series. Designed for closed-loop control of proportional valves and other hydraulic actuators, the module converts low-level electrical reference signals into current-driven outputs that modulate spool position. By integrating with PLC or analog controllers, it bridges command circuitry and field devices in industrial automation systems.

The card accepts a differential command voltage of ±10 V, allowing direct connection to common motion or process controllers that use this standardized range. The voltage input presents an impedance of 47 kΩ, so it draws minimal loading current and preserves signal integrity on long cable runs. An external enable line is required; when a logic level of +24 V is applied to the Drive Enable terminal the amplifier output stage is activated. The onboard digital outputs can sink or source up to 100 mA each, enough to drive status lamps or interposing relays without auxiliary transistors. For position feedback loops that use displacement transducers, the board supplies an isolated excitation of +15 V to an LVDT sensor.

Current feedback from the command source enters on pin z6, while the optional inverting-voltage signal is accepted on pin z10 to support fully differential control arrangements. When PID functionality is toggled, the control line draws a maximum of 10 mA, so low-power logic outputs can handle the load. Two internal reference rails deliver ±10 V at 5 mA each for convenient test or trim functions. Diagnostic circuitry reports transducer status: a fault raises the output toward Vcc − 2 V, and an OK condition stays below <3 V. The entire assembly operates from a single 24 V DC supply, simplifying cabinet wiring and permitting use in mobile or stationary hydraulic power units.