Product Description:

The 422CEH is a compact DC servo amplifier manufactured by Copley Controls for the DC Servo Amplifiers series. Designed for integration in industrial automation axes, it translates low-level command voltages into controlled motor current, enabling precise torque and speed regulation of DC servomotors. The module accepts single-ended or differential reference signals and drives brushed or brushless motors directly from a DC supply.

During operation, the amplifier can source or sink 10 A continuously and rise to 20 A for bursts up to 1 s, giving machines headroom for acceleration events. The current loop spans 3 kHz, while the power stage is modulated at 25 kHz, so motor ripple and acoustic noise are minimized. Reference commands encounter a 100 kΩ input impedance that reduces controller loading, and the input logic recognizes signals above 2.5 V. At the rated continuous current, the unit dissipates 54 W; when idle, it draws only 3 W from the DC bus. A built-in auxiliary ±5 V rail supplies up to ±5 mA for external sensors, keeping small feedback circuits independent of separate supplies.

The finned aluminum heat sink is 38.1 mm thick, weighs 0.35 kg, and provides 1.6 °C/W thermal resistance to ambient airflow. An internal sensor trips the drive at 70 °C to protect the power devices. Bus monitoring disables output above 185 V or when the supply falls below 22 V, preventing damage from unstable sources. Overvoltage and undervoltage events clear automatically once bus levels return to the operating range, reducing restart time. Thermal safeguards work with the heat sink mass to keep junction temperatures stable during extended duty. The dedicated shutdown thresholds support fault tracing without external instrumentation.