COPLEY CONTROLS Industrial Partner

Copley Controls 4122D Amplifiers-DC Brush Servo Amplifiers with PWM Inputs; 20A peak, 10A continuous, +22 to +90VDC brush motor amplifier with PWM inputs. Simple Type: Amplifier

Models 4122D and 4212D are third-generation amplifiers for dc brush motors from Copley Controls Corp. Built using surface-mount technology, these amplifiers offer plug and play operation in a very small package. Both models take digital, one or two wire PWM signals as command inputs, and convert them to internal ±10V to operate motors in torque or velocity mode.Two-wire PWM data format interfaces with microcontrollers such as the National LM-629, or control cards that output a 0% to 100% PWM signal for magnitude, and a DC signal for direction. Positive or negative logic levels are jumper-selectable. One wire format uses a 50% duty cycle PWM command for ‘0’ and 0% or 100% duty cycles for positive and negative full-scale. A differential analog input takes brush tachometer signals for velocity-loop operation. Model 4122D operates from +22 to +90VDC unregulated power supplies, and outputs 10A continuous, 20A peak.Model 4212D operates from +22 to +125VDC power supplies, and outputs 6A continuous, and 12A peak.The active logic-level of the amplifier Enable input is jumper selectableto GND or +5V to interface with different control cards.The /Pos and /Neg enable inputs remain ground active for fail-safe operation. A mosfet H-bridge output stage delivers power in four-quadrants for bi-directional acceleration and deceleration of motors. An internal solderless socket holds 17 components that configure the various gain and current limit settings to customize the amplifiers for a wide range of loads and applications.Header components permit compensation over a wide range of load inductances to maximize bandwidth with different motors.Individual peak and continuous current limits allow high acceleration without sacrificing protection against continuous overloads. Peak current time limit is settable to match amplifier to motor thermal or commutation limits. All models are protected against output short circuits ( output to output and output to ground ) and heatplate overtemperature.With the /Reset input open, output shorts or heatplate over temperature will latch off the amplifier until power is cycled off & on, or until the /Reset input is grounded. For self-reset from such conditions, wire /Reset to ground and the amplifier will reset every 200ms. A bicolor led speeds diagnostics during set-up, or for fault isolation after the unit is in service.

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