303P Copley Controls
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The Copley Controls 303P is part of the DC Servo Amplifiers series and offers a peak current of 12 Amps with a peak voltage drop of 3.12 Volts. The amplifier features a PWM switching frequency of 22 kHz and a small-signal bandwidth of 3 kHz. It has an overtemperature threshold of 83 degrees Celsius and an output resistance of 0.26 Ohms.
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Product Description:
The 303P is a DC servo amplifier produced by Copley Controls for the DC Servo Amplifiers series. It translates low-level command signals into controlled motor current, allowing automation systems to regulate velocity or position without connecting large power stages directly to control electronics. Within an industrial cabinet, the unit interfaces with motion controllers, delivers bidirectional armature current, and monitors load conditions so electromechanical axes remain responsive under changing demands.
The command input spans a reference range of ±10 V, so full output current is available when the controller drives the signal to either limit. A built-in current-feedback port scales measured motor current at 2.0 A/V, allowing the control system to close a fast outer loop without additional shunts. The amplifier’s analog monitor saturates at ±6 V, and its normal logic output remains at +5 V through a 1.87 kΩ series resistor that protects downstream optoisolators. Internally, a pulse-width modulator switches at 22 kHz, moving switching artifacts above most mechanical resonance ranges. The small-signal bandwidth extends to 3 kHz for precise tracking of high-rate corrections. The specified gain profile assumes a 250 µH inductive load and a 2.5 Ω resistive load. The H-bridge has an output resistance of 0.26 Ω, limiting unwanted voltage drops during transient operation.
For short bursts, the amplifier can source or sink 12 A for up to 1 s, supporting temporary torque demands during rapid acceleration or deceleration. The conduction path adds only 3.12 V of peak drop, preserving more motor voltage when the axis operates under a high load. Thermal shutdown begins near 83 °C to protect the internal semiconductors from excessive heat. The enable input recognizes an active-low command at ground level, allowing external control circuitry to disable the output stage directly. The reset node is biased through a 100 kΩ pull-up resistor, which provides a stable default state for external fault logic. Bidirectional current delivery allows the H-bridge to drive and brake the connected motor without requiring a separate reversing stage.
