Copley Controls: Junus (JSP-090 Series)

20-180 VDC Digital Drives for Brush Motors

Description:

The Junus™ digital servo amplifier puts 100% digital control of DC brush motors in a panel-mounting package with power options to ±15 Adc continuous and ±30 Adc peak from +20 Vdc to +180 Vdc DC power supplies.

Torque mode operation works with popular position-loop controllers that use PID filters to close a position-loop. Sensorless velocity control works with position loop controllers that only output a position-error signal such as PLC’s. Set-up is fast and automated by CME 2™ software operating under Windows®.

CME 2™ communicates with Junus™ through an RS-232 link for complete amplifier setup. Auto-tuning algorithms in CME 2™ slash set up times for fast system commissioning by automating current and velocity-loop tuning. A powerful oscilloscope and signal generator display amplifier performance for fine tuning thereafter.

Amplifier control parameters are saved in non-volatile flash memory. OEM’s can inventory one part, and configure amplifiers on-site to each axis in a machine.

Current-loop sampling at 20 kHz yields high-bandwidth with full adjustability. The velocity loop is sampled at 4 kHz for wide velocity bandwidths.

Carrier-cancellation modulation all but eliminates motor ripple current and dissipation at a standstill, and provides excellent crossover characteristics for voice-coil applications that demand low distortion around zero. PWM ripple is at 40 kHz, further minimizing losses in low-inductance motors.

Sensorless velocity control regulates motor back-EMF and compensates for changes in load that would cause a speed change with simple voltage controls. Amplifier output voltage is increased to offset the internal I*R voltage drops, keeping back-EMF constant. All amplifier circuits are DC coupled and operate from unregulated transformer-isolated DC power supplies, or regulated switching power supplies.

The panel-mount package is compatible with the mounting footprint of Copley’s 4xx series analog DC brush-motor amplifiers, offering an easy upgrade to 100% digital control.

Control Modes

Command Interface

Communications

Feedback

I/O - Digital

Dimensions: mm [in]

Model No.: JSP-090-10, JSP-090-20, JSP-180-10, JSP-180-20, JSP-180-30