EEA-PAM-581-D-32 Vickers
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The EEA-PAM-581-D-32 is a power amplifier manufactured by Vickers and is part of the EEA-PAM Power Amplifiers series. It operates with a supply voltage of 24 VDC and offers a control supply output of +15 VDC. The unit features an alarm output maximum current of 50 mA and various input impedances, including 47 kΩ for command voltage and 6 kΩ for feed-forward input.
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Product Description:
The EEA-PAM-581-D-32 plug-in card is a power amplifier module produced by Vickers and delivered within the EEA-PAM Power Amplifiers series. Installed in hydraulic valve controllers, it converts low-level electrical commands into proportional solenoid current so that flow or pressure can be modulated in closed-loop industrial automation.
The board is energized from a system rail of 24 VDC, and it also sources an auxiliary control supply of +15 VDC for external transducers. A 0 to ±10 V reference signal sees a 47 kΩ input impedance, while a separate 0 to ±20 mA command path is terminated by 100 Ω. The feed-forward summing node is isolated by 6 kΩ, allowing velocity-type signals without upsetting loop stability. Additional circuitry includes a 10 kΩ ramp generator input that pairs with a 10 kΩ ramp active output, a 10 kΩ monitor point for diagnostic scopes, and a 50 Ω drive-zero output that lets service personnel null the stage. Dual reference outputs supply ±10 V at 5 mA each to bias external potentiometers or position sensors.
Protective functions are handled by an alarm driver that can sink or source up to 50 mA through a resistor of 50 Ω, giving PLCs a clean fault contact. Sensor feedback options include a current input that repeats the earlier 100 Ω termination and a voltage input buffered by 1 MΩ, preventing load on delicate transducers. For field tuning, the monitor test jack and the ramp active output share a high-impedance path of 10 kΩ, so oscilloscopes can be connected without altering the command profile or disturbing the hydraulic response.
