Product Description:

The EEA-PAM-523-C-32 is a plug-in power-amplifier card produced by Vickers for the EEA-PAM Power Amplifiers series. Mounted in a valve-driver rack, the board translates low-level control signals from a PLC or motion controller into the regulated coil currents that proportional hydraulic valves need for repeatable flow or pressure control in automated machinery.

The card operates from a supply of 24 VDC, and it accepts a bipolar reference of 10 V at a source current of 10 mA. For systems that transmit commands as current loops, a bipolar input of 20 mA is available, buffered by an input impedance of 100 Ω to limit loading on upstream transmitters. Four independent command-voltage inputs let an external sequencer select between preset profiles, while an equal number of ramp generators soften step changes to prevent hydraulic shock. The board also offers four logic-level lines that gate each channel and a test socket that permits safe monitoring with 2.0 mm probes during commissioning.

An onboard auxiliary rail of 15 VDC supplies sensors or signal conditioners connected to the module. When open-loop adjustment is required, a front-panel potentiometer of 5 kΩ can inject a manual command, provided the knob’s power rating meets the 0.25 W minimum. Internal trimming stages include four multiturn preset potentiometers, each factory-sized at 50 kΩ, so technicians can balance offset and gain without affecting the field wiring. Polarity selection for differential inputs is handled through a high-impedance node of 47 kΩ; its value keeps the bias network from disturbing the reference source while still offering clear logic thresholds. Together these elements give the amplifier predictable response, quick reconfiguration, and straightforward service access for hydraulic motion applications.