800-303 Copley Controls
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
The Copley Controls 800-303 is part of the DC Servo Amplifiers series and features a rated bandwidth of 3 kHz with a PWM switching frequency of 22 kHz. It has a peak voltage drop of 3.12 V and an output resistance of 0.26 Ohms. The chassis temperature limit is 83 degrees Celsius and the undervoltage cutoff is 16 V.
Internal Product Review
The 800-303 is a Copley Controls DC servo amplifier with a 3 kHz rated bandwidth and 22 kHz PWM switching frequency. Low 0.26 Ω output resistance and a 16 V undervoltage cutoff support stable drive behavior in precision motion applications. A well-tuned amplifier for compact servo systems, highlighted by fast control response and dependable electrical protection.
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Product Description:
The 800-303 is a DC servo amplifier manufactured by Copley Controls and supplied under the DC Servo Amplifiers series. Designed for industrial automation, it translates low-level motion commands into motor armature power, supporting accurate current regulation for high-response axes. The module mounts to a panel inside a cabinet and connects to external control logic, feedback sensors, and a DC bus to complete the drive chain.
The amplifier has a rated closed-loop bandwidth of 3 kHz, which allows tight current control across typical mechanical loads. Pulse-width modulation runs at 22 kHz, keeping switching ripple above the servo band. The amplifier was characterized with inductances of 4 mH for the L-Dash-1 model and 250 µH for the standard coil while using a 2.5 Ω load, illustrating how coil impedance affects bandwidth. Output impedance is only 0.26 Ω, minimizing voltage loss, and the internal path can tolerate a peak drop of 3.12 V before saturation. A protective cutoff removes drive power when the bus voltage falls below 16 V to prevent uncontrolled operation. The shunt network includes a 1.87 kΩ resistor that stabilizes feedback, while logic lines use a 100 kΩ reset pull-up to return the controller to its default state after a power cycle.
Operation must stop if the chassis temperature reaches 83 °C, protecting semiconductor junctions when the cabinet lacks active cooling. The current-monitor output is scaled at 2.0 A/V, so a meter reading of 1 V corresponds to 2 A of motor current and simplifies tuning. The control electronics can supply a 100 µA load from the onboard +5 V rail. They can also supply up to 3 mA from the +14 V reference for connected control circuits. These auxiliary outputs provide power for low-current feedback and isolated logic components without placing excessive demand on the internal supply rails.
