Product Description:

The EEA-PAM-561-A-32 is a plug-in power amplifier card manufactured by Vickers for the EEA-PAM Power Amplifiers series. Installed in a valve control rack, it converts low-level command voltages into regulated solenoid current so proportional hydraulic valves follow electronic setpoints with repeatable accuracy. The card also provides internal reference sources and fault monitoring that reduce the need for external signal conditioning in automated machinery.

The amplifier draws a nominal supply of 24 VDC and its total consumption is limited to 50 W, so cabinet power budgeting is straightforward. It can deliver up to 2.9 A of coil current, allowing direct drive of medium-size proportional solenoids without an external booster. A voltage input impedance of 47 kΩ minimizes loading on PLC analog outputs, while a separate current input path presents 100 Ω for systems that transmit a 4–20 mA signal. Factory gain is preset to 10%/V, meaning a one-volt change at the command terminals alters output by ten percent of full scale. Additional characteristics include a 10 percent deadband compensation network, an enable line that senses 22 kΩ, and automatic reverse-polarity protection on the supply.

Internal housekeeping rails are supplied as ±15 V at 50 mA to power feedback sensors, and the board exports a precision reference of ±10 V rated at 5 mA for external potentiometers. The reference is held within ±1% so downstream circuits can rely on stable calibration. MP1 and MP2 monitor points each present 10 kΩ, letting service personnel probe output signals without disturbing operation. If output current rises above safe limits the overload circuit trips and then restores automatically, an action indicated in the specification as Automatic Reset. At zero-volt command the unit sources 1.1 A to keep the valve centered, and the factory 10 percent deadband trim prevents unintended spool motion when small input noise is present.