Product Description:

The 422CE is a single-axis drive module produced by Copley Controls as part of the DC Servo Amplifiers series. In automated machinery, it translates differential analog references into controlled motor current, allowing precise velocity or torque control on brushed or brushless DC machines. Installed between a motion controller and the motor, the module provides controlled acceleration, deceleration, and holding force without requiring mechanical adjustments.

At the power stage, the unit supplies a continuous motor current of 10 A, while a surge capacity of 20 A can be maintained for 1 s to accommodate rapid load changes. Output resistance is 0.2 Ω, so the voltage drop across the driver remains small even at higher currents. Modulation is generated at a 25 kHz PWM rate, and the internal control loop supports a voltage bandwidth of 200 Hz, providing tight regulation over a broad speed range. The reference port accepts ±20 V commands and has an input impedance of 100 kΩ to minimize loading on the signal source. Digital enable signals pass through a 10 kΩ optically isolated input that switches at a 2.5 V logic threshold. Once the enable signal is asserted, conduction begins after a 50 ms delay. The amplifier’s internal electronics draw 3 W, limiting heat generation in the panel during standby operation.

The current control loop has a bandwidth of 3 kHz, allowing the drive to correct error signals within the mechanical response time of most servo axes. Thermal monitoring disables the output when the heat sink temperature reaches 70 °C, protecting the power stage from excessive heat. An independent trip disconnects the motor if the bus voltage exceeds 185 V or falls below 22 V. The upper voltage limit protects against regenerative overshoot, while the lower limit prevents continued operation during brownout conditions. These protective functions operate without external relays and help keep the power semiconductors within their permitted operating range during continuous duty.