306 Copley Controls
Wake Industrial LLC is not an authorized distributor of this product.
The Copley Controls 306 is a DC servo amplifier from the DC Servo Amplifiers series. It features a bandwidth of 3 kHz with a typical bandwidth test inductance of 125 microhenries and a test resistance of 1.0 ohm. The amplifier includes an overtemperature threshold of 83 degrees Celsius and an undervoltage cutoff at 16 volts.
Internal Product Review
The 306 is a Copley Controls DC servo amplifier that stands out with 3 kHz bandwidth and 0.13 Ω output resistance. Diagnostic performance is especially useful in tuning work, with a ±6 V current monitor and 4.17 A/V scaling. Thermal and power protection are well engineered, highlighted by an 83°C overtemperature threshold and a 16 V undervoltage cutoff.
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Product Description:
The 306 is a single-axis DC servo amplifier produced by Copley Controls within the DC Servo Amplifiers series. It drives brushed or brushless servomotors by converting a regulated DC bus into a bidirectional current loop that follows an external command. In an automation cell, the unit closes the torque loop, allowing a motion controller to concentrate on position and velocity tasks while the amplifier maintains accurate motor current. This division of control functions supports responsive motion in systems that use external command and feedback devices.
The amplifier has a small-signal bandwidth of 3 kHz when connected to a load with an inductance of 125 µH and a resistance of 1.0 Ω, making it suitable for voice-coil actuators and low-inertia motors. At the power stage, the output impedance is only 0.13 Ω, allowing tight current regulation up to the ±6 V monitor full scale associated with the 4.17 A/V feedback gradient. Internal transistors saturate at 3.25 V, so the bus voltage should remain high enough to prevent clipping during peak torque commands. A dedicated reference provides 3 mA at +14 V for Hall sensors or other low-power electronics. The command reset line is pulled high through a 100 kΩ resistor, and the normal series output resistor of 1.87 kΩ stabilizes the error amplifier against oscillation. These electrical characteristics support accurate current response without placing excessive demand on the external control signal.
An internal thermal sensor triggers at 83 °C, forcing a shutdown before the power transistors exceed their allowable temperature. If the bus voltage drops below 16 V, the undervoltage circuit disables the output to prevent a loss of current control. To keep switching transients within acceptable limits, the installation must include a 200 µF bypass capacitor across the supply. The minimum load inductance is 30 µH at 20 V and 63 µH at 40 V, and it reaches the stated test inductance at 80 V. The bypass capacitor suppresses supply transients, while the load-inductance limits reduce current ripple that could interfere with precise torque production.
