Product Description:

The EEA-PAM-525-A-33 is a plug-in power amplifier card manufactured by Vickers within the EEA-PAM Power Amplifiers series. It translates low-level voltage or current references from a controller into regulated drive current for proportional solenoids used in industrial automation loops. By combining power conversion, signal conditioning, and protective thresholds on one module, it provides the interface needed to actuate valves or cylinders directly from a PLC while simplifying cabinet wiring.

The card is powered from a nominal 24 VDC source and its internal circuitry is rated for a baseline consumption of 50 W. Supply lines are guarded by reverse-polarity protection, and operation ceases at an 18 VDC shut-down point to prevent undervoltage faults. When the input reference rises above 9.8 V the drive channel is enabled; a 4.5 V threshold disables it. Command changes are shaped by an adjustable ramp that can complete in as little as 50 ms, limiting pressure shocks in hydraulic circuits. In voltage mode the board accepts ±10 V signals through a 47 kΩ input path, while a 0 V reference draws only 0.3 A from the supply. Designers can also work in current mode, confident that the solenoid line will never exceed the 2.7 A ceiling.

For auxiliary electronics the amplifier delivers a regulated ±15 VDC supply. Current command control ranges over ±20 mA with a front-end impedance of 100 Ω, allowing simple loop-powered transmitters to drive the board without additional buffering. Factory calibration sets small-signal gain at 10 percent per volt and imposes a preset deadband of 15% so minor noise does not disturb the valve spool. Output current is limited to 2.7 A, matching common proportional solenoids and ensuring thermal margins remain within the 50 W power budget during continuous service.