CACR-SR05AY1SR is a discontinued full-digital AC SERVOPACK under Yaskawa VS-800 CACR-SR CNC dedicated servo platform, matched with 0.5kW low-inertia USAREM series servo motors for early Yasnac analog CNC control systems. It adopts three-loop closed-loop control architecture optimized for ±10V analog speed command, featuring rack-mounted compact structure and built-in power braking transistor. Equipped with reinforced analog signal anti-interference circuits for complex electromagnetic environments of machine shops, this unit carries fixed OEM I/O signal definition customized for Yasnac controllers. It is only used as spare replacement parts for aging small CNC feed axes, supporting analog speed and torque control with limited auxiliary pulse positioning function, and integrates comprehensive hardware interlock protection to guarantee stable precision machining motion output.

CACR: Standard series identifier of Yaskawa AC servo drive SERVOPACKSR: CNC special sub-series optimized for analog speed control05: Rated matching motor power, 0.5 kilowattsAY: Specialized hardware specification code; rack mounting structure, dedicated analog signal processing circuit, enhanced noise suppression filter, built-in braking power circuit, terminal layout different from wall-mounted BA/BB general models1: First generation main control board hardware revision versionSR: Encoder matching specification, compatible with 15-bit composite incremental-absolute encoders, dedicated shielded wiring terminals for encoder feedback

Power input only supports three-phase 200–230V AC with allowable voltage fluctuation of ±10%; single-phase power supply is not compatible with this AY rack variant. Rated continuous output current is 4.2A, peak instantaneous output current reaches 12.6A to output triple short-time overload torque for rapid acceleration of light-load axes. Maximum control loop bandwidth reaches 360Hz, cooperating with 15-bit absolute encoder feedback to realize micron-level 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% without condensation. Unit protection rating is IP20 for installation inside electrical cabinet racks, vibration resistance complies with machine tool industrial standard covering 10–1500Hz. Multi-layer safety protection functions include overvoltage, undervoltage, overcurrent, overload, overheating, encoder disconnection, motor phase loss, emergency stop hardware interlock and braking circuit abnormality detection. Standard heat dissipation adopts 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 parameter configuration; a reserved differential pulse input channel only provides simple auxiliary positioning with restricted functional parameters. 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 use relay isolation to transmit servo ready, speed arrival, positioning completion and drive fault alarm feedback signals to Yasnac host controller. Dedicated encoder terminal block supports A/B/Z phase differential signals and absolute encoder backup battery wiring, with independent shielding grounding terminals to restrain long-distance wiring signal interference. Built-in RS422 serial communication port only matches Yaskawa dedicated handheld operator panel for parameter editing, real-time operating data reading and fault history record inquiry; no native industrial fieldbus interface is reserved at factory delivery. 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 equipped with lockable wiring structures to prevent terminal loosening under long-term machine vibration. All analog signal circuits integrate independent common-mode filter circuits to adapt severe 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. 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 reciprocating high-speed motion.

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

Before power-on installation, verify three-phase power supply voltage conforms to the drive rated specification, completely separate power cables and analog signal cables with full shielding, and connect encoder cable shielding layer to the dedicated drive grounding terminal. After initial installation, complete parameter initialization matching corresponding Yasnac CNC system, run automatic gain tuning based on actual mechanical load characteristics, and adjust speed limit, torque upper threshold and soft start-stop parameters to reduce mechanical impact on machine tools. Monitor operating status via front panel LED indicators during daily operation: steady green light signifies normal servo operation, while flashing red light displays fault alarm codes. For standard workshop environments, routine maintenance shall be conducted every two months: clean 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 backup battery voltage of absolute encoders. When a fault occurs, record the fault code first, cut off three-phase main power supply after the motor fully 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 no less 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, so 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 circuit and braking transistors. Immediately replace the built-in cooling fan upon detecting abnormal noise or slow rotation to prevent overheat shutdown failures. Store spare drives in dry constant-temperature warehouses with moisture-proof packaging to prevent circuit board oxidation and encoder circuit malfunction.