Copley Controls: DC Brushless Servo Amplifier (503 Series)
DC Brushless Servo Amplifier ±50 Volts output at ±10A Peak, ±5A Continuous
Model 503 is a complete pwm servo amplifier for applications using DC brushless motors in torque ( current ) mode. It provides six-step commutation of three-phase DC brushless motors using 60° or 120° Hall sensors on the motor, and provides a full complement of features for motor control. These include remote inhibit/enable, directional enable inputs for connection to limit switches, and protection for both motor and amplifier.
The /Enable input has selectable active level ( +5V or gnd ) to interface with most control cards. /Pos and /Neg enable inputs use fail-safe (ground to enable) logic. Power delivery is four-quadrant for bi-directional acceleration and deceleration of motors.
Model 503 features 500W peak power output in a compact package using surface mount technology. An internal header socket holds components which configure the various gain and current limit settings to customize the 503 for different loads and applications.
Separate 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 limits.
Header components permit compensation over a wide range of load inductances to maximize bandwidth with different motors.
Package design places all connectors along one edge for easy connection and adjustment while minimizing footprint inside enclosures.
High quality components and conservative ratings insure long service life and high reliability in industrial installations.
A differential amplifier buffers the reference voltage input to reject common-mode noise resulting from potential differences between controller and amplifier grounds.
Output short circuits and heat plate over-temperature cause the amplifier to latch into shutdown. Grounding the reset input will enable an auto-reset from such conditions when this feature is desired.
Complete torque ( current ) mode functional block
Drives motor with 60° or 120° Halls
Single supply voltage 18-55VDC
5A continuous, 10A peak more than double the power output of servo chip sets.
Fault protected Short-circuits from output to output, output to ground Over/under voltage Over temperature Self-reset or latch-off.
2.5kHz bandwidth
Wide load inductance range 0.2 to 40 mH.
+5, +15V Hall power
Separate continuous, peak, and peak-time current limits
Surface mount technology
Dimensions: 120 x 84 x 33 mm (4.7 x 3.3 x 1.3 in)
NO POTS: Internal component header configures amplifier for applications.
Conservative design for high MTBF
Low cost solution for small brushless motors to 1/3 HP
Copley Controls: Trapezoidal Torque Amplifier (503 
