CACR-SR05AB1ER-Y19 is an end-of-life full-digital AC SERVOPACK under Yaskawa VS-800 CACR-SR CNC dedicated servo platform, matched with 0.5kW low-inertia USAREM servo motors for early Yasnac analog CNC control systems. It adopts three-loop closed-loop control architecture optimized for ±10V analog speed command signals, with compact rack plug-in mechanical structure and integrated power braking transistor circuit. This unit is equipped with multi-stage analog signal noise suppression filters to resist severe electromagnetic interference inside metal machining workshops, featuring fixed OEM-customized I/O signal definition exclusively for Yasnac CNC controllers. It is only supplied as spare replacement parts for aging small CNC feed axes, taking analog speed and torque control as primary operation modes with limited auxiliary differential pulse positioning capability, and integrates complete hardware safety interlock protection to maintain stable low-speed constant torque output for miniature precision machining equipment.

CACR: Standard series identifier of Yaskawa AC servo SERVOPACKSR: CNC specialized sub-series centered on analog speed control05: Rated matching motor power, 0.5 kilowattsAB: Special hardware specification code; rack plug-in mounting structure, dedicated analog signal processing circuit, enhanced common-mode filter circuits, built-in braking power module, terminal layout and internal wiring different from wall-mounted BA/BB general servo drives1: First-generation hardware revision version of the main control boardER: Encoder matching specification, compatible with 15-bit composite incremental-absolute encoders, configured with dedicated shielded multi-core encoder signal terminalsY19: Exclusive OEM customized suffix for designated Yasnac CNC system generations, fixed I/O signal allocation mapping, optimized handshake communication logic matching specific Yasnac controller hardware, unified three-phase 200V industrial voltage grade without regional functional modification

Power input only supports three-phase 200–230V AC with allowable voltage fluctuation of ±10%; single-phase power supply is not compatible with this AB rack plug-in variant. Rated continuous output current is 4.2A, peak instantaneous output current reaches 12.6A to deliver triple short-time overload torque for rapid acceleration of light-load CNC feed axes. Maximum control loop bandwidth reaches 360Hz, cooperating with 15-bit absolute encoder feedback to realize micron-level repeated positioning accuracy. Continuous operating ambient temperature ranges from 0°C to 40°C; storage temperature spans -20°C to 70°C, relative humidity controlled between 5% and 80% with zero condensation permitted. The unit holds IP20 protection rating for cabinet rack installation, vibration resistance complies with standard machine tool industrial criteria covering 10–1500Hz. Multi-layer built-in safety protection covers overvoltage, undervoltage, overcurrent, overload, overheat, encoder disconnection, motor phase loss, emergency stop hardware interlock and braking circuit abnormality detection. Standard heat dissipation mode is forced air cooling with built-in miniature cooling fan, total unit weight is approximately 1.5 kilograms.

The core command input channel is 0 to ±10V analog voltage interface preset for speed control mode, which can be switched to torque command mode via internal parameter configuration; a reserved differential pulse input channel only supports simple auxiliary positioning with restricted adjustable parameter range. Isolated digital input terminals receive servo enable, alarm reset, positive/negative travel limit, proximity homing switch and CNC system safety interlock signals. Digital output terminals adopt relay isolation to transmit servo ready, speed arrival, positioning completion and drive fault alarm feedback signals to Yasnac host controller. Dedicated encoder terminal block processes A/B/Z phase differential signals and absolute encoder backup battery wiring, with independent shielding grounding terminals to restrain long-distance wiring signal attenuation and interference. Built-in RS422 serial communication port works exclusively with Yaskawa dedicated handheld operator panel for parameter editing, real-time operating data reading and fault history record inquiry; no native industrial fieldbus interfaces are factory equipped. Power terminal blocks include three-phase main power R/S/T input, U/V/W motor power output, external braking resistor expansion port and safety grounding terminal, all fitted with lockable wiring structures to prevent terminal loosening under long-term machine vibration. All analog signal circuits integrate independent multi-stage common-mode filter circuits to adapt complex electromagnetic interference environment of machining workshops.

Full digital independent adjustable gain parameters for current, speed and position closed loops, supporting one-click automatic mechanical gain tuning to eliminate low-frequency mechanical resonance without tedious manual parameter calibration. Three switchable control modes via parameter setup: analog speed control as primary mode for CNC feed axes, torque control for light tension winding and compression holding processes, auxiliary pulse position control for simple fixed-length positioning tasks. Multi-stage embedded notch filters suppress mechanical oscillation during frequent high-speed acceleration and deceleration reciprocating motion. Built-in electronic gear function allows arbitrary gear ratio adjustment to match various mechanical reduction structures without physical mechanical modification. Multiple homing modes are supported including dog-trigger homing and encoder Z-phase signal homing, with adjustable homing velocity and position offset parameters. Short-duration triple overload torque output satisfies rapid acceleration demand of small light-load CNC axes. Integrated self-diagnosis system automatically records fault codes and pre-alarm operating states; most minor faults support remote alarm reset without power cycling, while severe hardware faults require full power-off restart to clear alarm status. Internal integrated braking circuit realizes energy consumption braking during motor deceleration, and external braking resistors can be expanded for equipment with frequent high-speed reciprocating movement.

This servo drive is specially matched with early Yasnac analog CNC systems, applied to small light-load feed axes of miniature lathes, surface grinders and desktop vertical machining centers. Secondary typical applications include miniature textile winding and unwinding axes, small electronic assembly indexing turntables, desktop automatic test positioning platforms, mini printing paper feeding and registration axes, and light-duty sorting conveyor auxiliary motion axes. It is designed for rack plug-in installation inside sealed indoor electrical cabinets of machining workshops. Deployment in high-dust, corrosive gas, long-term high-temperature or water splashing environments is forbidden without fully sealed extra protective enclosures. As an EOL discontinued legacy model, it is only suitable for maintenance and spare part replacement of aging CNC and automation equipment, and not recommended for new equipment development projects.

Before power-on installation, confirm three-phase power supply voltage matches the drive rated specification, completely separate power cables and analog signal cables with full shielding, and connect the shielding layer of encoder cables to the dedicated grounding terminal of the drive. After initial installation, complete parameter initialization matching the corresponding Yasnac CNC system, run automatic gain tuning according to actual mechanical load characteristics, and adjust speed limit, torque upper limit and soft start-stop parameters to reduce mechanical impact on machine tools. Judge operating status through front panel LED indicators during daily operation: steady green light means normal servo operation, flashing red light displays fault alarm codes. Under standard workshop conditions, conduct routine maintenance every two months: clean the built-in cooling fan and ventilation ducts to remove dust blocking heat dissipation, re-tighten all wiring terminals, inspect encoder cable outer jackets for abrasion, and test the backup battery voltage of absolute encoders. When a fault occurs, record the fault code first, cut off three-phase main power after the motor completely stops, then troubleshoot wiring short circuits, mechanical jamming or encoder damage according to fault definitions. For long-term equipment shutdown, disconnect the 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 a short time to protect internal rectifier circuits and braking transistors. Replace the built-in cooling fan immediately once abnormal noise or slow rotation is detected to prevent overheat shutdown failures. Store spare servo drives in dry constant-temperature warehouses with moisture-proof packaging to avoid circuit board oxidation and encoder circuit malfunction.