EHA-PID-201-A-20 by Vickers

The EHA-PID-201-A-20 is a PID control power supply module built by Vickers within the EHA Power Supplies series. Designed for installation in motion or pressure control loops, the unit delivers regulated reference and feedback rails so proportional, integral, and derivative amplifiers on connected valve or drive cards stay within calibrated limits. In industrial automation panels, it acts as a low-power conditioning stage that converts the cabinet's DC bus into balanced analog signals and stable DC references for sensors, command sources, and closed-loop control electronics.

Nominal operation is achieved from a 24 VDC supply, and the module draws only 6 W, allowing it to share low-current auxiliary rails without excessive heat rise. Its enclosure carries an IP20 rating under IEC 529, so it is intended for mounting inside a closed control cabinet. The demand input accepts command voltages up to ±10 V through a high input impedance of 100 k?, which prevents loading of upstream controllers. The differential signaling path supports the same swing, improving common-mode rejection when paired conductors are used. Ripple on the internal rails may vary by ±10% peak without affecting downstream accuracy. The PID stage can source 5 mA at an output span of ±10 V, and a 100 ? burden is used for current-sourced feedback transducers to keep sensor loops linear.

The forward-path shaping input uses a feed-forward terminal, and its dedicated impedance of 6 k? protects reference generators from overcurrent. Separate precision rails supply a +10 V source and a -10 V sink, each rated at 10 mA, for potentiometric setpoint networks. For voltage feedback, the sensor port withstands the same command range and presents 1 M? of input resistance so signal integrity is preserved and source circuits are not heavily loaded. The module's component choices keep total output error within normal process limits.