Product Description:

The 5211 is a compact DC servo amplifier manufactured by Copley Controls for the DC Servo Amplifiers series. It occupies the drive slot in a closed-loop motion axis, where it conditions low-level command voltages from a controller and delivers controlled power to a brushed DC servo motor. Within an automation cell, the unit regulates armature current so that torque follows the reference signal, allowing positioning, tension, or speed loops to remain stable under dynamic load changes.

The power stage supplies a continuous output of 5 A and can surge to 10 A for brief overloads. These limits are coordinated with a peak duration of 1 second so thermal stress stays within safe bounds. Current is switched by a PWM bridge that operates at 25 kHz, keeping ripple outside most mechanical resonance bands. Small-signal behavior is governed by a closed-loop bandwidth of 3 kHz, which indicates how quickly the amplifier can follow command updates without excessive phase lag. The reference port accepts bipolar inputs up to ±20 V and presents 94 kΩ of input resistance, minimizing controller loading. Logic enable and fault lines interface through 10 kΩ optically isolated inputs that switch reliably around the 2.5 V threshold.

The output H-bridge exhibits an internal resistance of 0.4 Ω, so conduction losses remain low while the amplifier delivers its rated 20 W at continuous current. Protective circuitry removes drive power if the bus voltage rises to 182 VDC or if the heat plate reaches 70 °C, preventing component damage from abnormal supply conditions or inadequate cooling. An additional shutdown occurs below 22 VDC to guard against undervoltage brownouts that could stall the motor. The overvoltage, overtemperature, and undervoltage protections interrupt motor power when operating conditions move outside the permitted range.