Product Description:

The EEA-PAM-535-A-30 is a plug-in power amplifier card manufactured by Vickers for the EEA-PAM Power Amplifiers series. It converts low-level command signals into regulated coil current so proportional hydraulic valves move with controlled speed and force in presses, molding machines, and other automation lines. By providing internal references, ramp shaping, and supply monitoring, the card forms the interface between electronic motion controllers and high-pressure fluid power actuators.

The module accepts a nominal supply of 24 VDC, tolerates line excursions up to 40 VDC, and shuts down below 18 VDC to protect connected coils. A maximum ripple of ±10% pk-pk is allowed without degrading regulation, and overall consumption stays within 40 W. Two onboard ramp potentiometers set separate acceleration and deceleration profiles; they can shorten the command slope to the 0.050 s minimum so flow matches rapid-cycle demands. Reference circuitry furnishes ±10 V at 5 mA with ±1 % accuracy, providing a stable command source for external loop controllers. This reference stage isolates the machine controller from load variations and improves long-term offset stability.

An auxiliary ±15 VDC rail, rated for 50 mA, powers feedback transducers and is interlocked with the drive’s gating logic. The logic input recognizes the system controller as active once the signal reaches 9.8 VDC through its 22 kΩ pull-down network; when the line falls to 4.5 VDC or lower the amplifier is disabled, ensuring safe hydraulic shut-off before supply loss. For motion smoothing the same gating path collaborates with the ramp ceiling identified as 5 s, letting axes coast instead of stopping abruptly. All auxiliary electronics draw on the control supply budget without affecting the main power channel. Consequently, valve position drift is avoided during partial power events and restart cycles.