CACR-PRA5AA4AH is a compact full-digital AC SERVOPACK belonging to Yaskawa CACR-PR general small-power servo series, designed to match 0.5kW low-inertia small servo motors for light-duty precision automation and small auxiliary machine axes. It adopts three-loop closed-loop digital control architecture, integrating power drive, signal processing and motion control circuits into a slim wall-mounted cabinet unit. This model supports dual single/three-phase 200V power input, compatible with both analog voltage and differential pulse command signals, featuring stable low-speed constant torque, compact size and strong anti-interference performance. Without special CNC OEM customization, it serves universal automation equipment, delivers reliable positioning and speed control for miniature light-load motion mechanisms, and remains available for both new machine assembly and legacy equipment replacement.

CACR: Standard series identifier for Yaskawa AC servo SERVOPACKPR: Compact general small-power servo sub-series with mini wall-mounted structureA5: Rated matching motor power, 0.5 kilowattsAA: Standard universal hardware specification; dual single/three-phase 200V power input, basic simplified digital I/O terminal layout, general wall-mounted installation structure, built-in standard braking circuit4: Fourth-generation main control board hardware revision versionAH: Global general industrial specification variant, standard international signal voltage level, no fixed OEM I/O definition, compatible with mainstream PLC, general motion controllers and small automation hosts worldwide

Input power supports single-phase 200–230V AC or three-phase 200–230V AC, allowable voltage fluctuation ±10%. Rated continuous output current is 4.2A, peak instantaneous output current reaches 12.6A to output triple short-time overload torque for fast light-load acceleration. Maximum control loop bandwidth reaches 380Hz, compatible with high-resolution incremental encoders up to 1,310,720 pulses per mechanical rotation. Continuous operating ambient temperature ranges from 0°C to 55°C; storage temperature spans -20°C to 70°C, relative humidity controlled between 5% and 90% without condensation. Unit protection grade is IP20 for internal electrical cabinet wall mounting, vibration resistance complies with general industrial standard covering 10–2000Hz. Comprehensive built-in safety protection includes overvoltage, undervoltage, overcurrent, overload, overheat, encoder disconnection and emergency stop hardware interlock. Standard heat dissipation adopts natural air convection without cooling fan, total unit weight is approximately 1.4 kilograms.

Position command channel adopts differential pulse input with high anti-interference performance for high-precision fixed-length positioning. 0 to ±10V analog voltage input supports parameter switching between speed command and torque command operation modes. Isolated digital input terminals receive servo enable, alarm reset, origin search and positive/negative travel limit signals. Digital output terminals adopt relay isolation to feed back servo ready, positioning completion, speed arrival and fault alarm status signals to external control devices. Dedicated encoder terminal block is reserved for A/B/Z phase differential incremental encoder signals, matched with shielded wiring to reduce long-distance signal attenuation. A built-in RS422 serial communication port works with Yaskawa dedicated handheld operator panel to complete parameter editing, real-time running status reading and fault history query. No fieldbus communication card is pre-installed; optional expansion modules can be added to realize bus communication docking on demand. Power terminal blocks include main power input, motor power output, external braking resistor expansion port and safety grounding terminal, all equipped with lockable wiring structures to prevent loose terminals under long-term equipment vibration. All signal interfaces are equipped with independent common-mode noise suppression circuits to adapt complex wiring electromagnetic environments of general production lines.

Independent adjustable gain parameters for current, speed and position closed loops, equipped with automatic mechanical gain tuning function to quickly match load characteristics and suppress low-frequency mechanical resonance without complicated manual parameter calibration. Three control modes can be freely switched via parameter settings: position control for high-precision fixed-length positioning, speed control for stable constant-speed operation, torque control for light tension winding and micro pressure holding applications. Built-in electronic gear function supports arbitrary gear ratio adjustment to match different mechanical reduction structures without physical mechanical modification. Multiple homing modes are supported including proximity switch homing and encoder Z-phase signal homing, with adjustable homing speed and position offset parameters. Multi-stage embedded notch filters effectively eliminate mechanical oscillation during acceleration and deceleration processes. Short-time triple overload torque output meets rapid acceleration demands of miniature light-load axes. Integrated fault self-diagnosis system automatically records fault codes and pre-alarm operating data for fast troubleshooting; most minor faults support remote alarm reset without power cycling, while severe hardware faults require power-off restart to clear alarm states. Internal integrated braking circuit realizes energy consumption braking during motor deceleration, and external braking resistors can be expanded for equipment with frequent reciprocating motion.

This servo drive targets low-power light-load miniature precision automation equipment across all manufacturing industries. Typical equipment includes small electronic assembly indexing rotary tables, desktop miniature packaging cutting mechanisms, compact automatic test positioning platforms, mini printing paper feeding axes, tiny textile filament winding equipment, and auxiliary feeding axes of small automated assembly lines. It is suitable for wall mounting inside sealed indoor electrical cabinets of ordinary workshop environments, applicable to light-load motion axes with low power demand and high positioning accuracy. Additional sealed protective enclosures must be configured if deployed in high-dust, corrosive gas or long-term high-temperature environments; it is not suitable for heavy-load equipment with frequent strong mechanical impact. As a standard mass-produced general model, it can be used for both new automation equipment development and maintenance replacement of old production machines.

Before power-on installation, confirm the power supply voltage matches the drive rated specification, fasten all wiring terminals tightly, and separate power cables and signal cables with full shielding to avoid cross interference. After initial installation, complete parameter initialization and automatic gain tuning, then adjust speed limit, torque upper limit and soft start-stop parameters according to actual mechanical load to reduce mechanical impact on precision equipment. Judge daily operating state through front panel LED indicators: steady green light represents normal servo operation, flashing red light displays corresponding fault alarm codes. Under standard workshop conditions, conduct routine maintenance every three months: clean heat dissipation air channels to remove accumulated dust blocking heat exchange, recheck the tightening torque of all wiring terminals, and inspect encoder cable outer jackets for abrasion and cracking. When a fault occurs, record the fault code first, cut off main power supply after the motor completely stops, then troubleshoot wiring short circuits, mechanical jamming or encoder damage according to fault definition descriptions. For long-term equipment shutdown, disconnect main power supply; wait more than 30 minutes before re-powering to avoid short circuits caused by internal circuit condensation. Do not disassemble internal power modules and control boards without professional maintenance authorization; high-voltage residual charge remains inside after power cut, wait at least 10 minutes before opening the drive housing for inspection. Avoid frequent rapid power-on and power-off cycles within short intervals to protect internal rectifier circuits. Store spare servo drives in dry constant-temperature warehouses with moisture-proof packaging to prevent circuit board oxidation and circuit malfunction.