The CACR-SR12TZ9SM-Y01 is a legacy full-digital AC SERVOPACK under Yaskawa CACR-SR VS-800 platform, engineered to pair with 1.2kW medium inertia servo motors for Yasnac CNC machine tools and traditional analog-controlled automation equipment. It adopts a three-loop closed-loop control framework optimized for analog speed command signals, integrating an internal power braking circuit and rack-mounted mechanical structure. This drive prioritizes stable low-speed constant torque and anti-interference performance to adapt to complex electromagnetic environments in machining workshops. It is an end-of-life model mainly used for spare part replacement of aging CNC and winding equipment, with complete hardware interlock protection and simplified I/O logic tailored to early Yasnac motion controllers.

CACR: Universal series code for Yaskawa AC servo drive SERVOPACKSR: Machine tool dedicated sub-series centered on analog speed control12: Nominal matching motor power, 1.2 kilowattsTZ: Specialized hardware specification; built-in braking power transistor, reinforced analog noise suppression circuit, rack-mounted layout distinct from wall-mounted BB/BA variants9: Hardware revision version of the internal main control boardSM: Encoder matching specification, compatible with composite 15-bit incremental-absolute encoders with dedicated shielded wiring terminalsY01: Yasnac OEM customized suffix, fixed CNC I/O signal definition, optimized communication handshake protocol for early Yasnac controller generations, standard 200V industrial voltage grade without regional customization

Power input only supports three-phase 200V to 230V AC with ±10% allowable voltage fluctuation; single-phase input is not supported for this rack-type unit. Rated continuous output current is 7.8A, and peak instantaneous output current reaches 23.4A to deliver three times rated short-time overload torque for rapid acceleration and heavy load startup. The maximum control loop bandwidth hits 350Hz, matching high-resolution 15-bit absolute encoder feedback for precise positioning. Continuous operating ambient temperature ranges from 0°C to 40°C; storage temperature spans -20°C to 70°C, with relative humidity limited between 5% and 80% and no condensation permitted. The unit carries an IP20 protection rating for internal cabinet rack installation, and vibration resistance complies with standard machine tool industrial criteria covering 10–1500Hz. Embedded multi-layer safety protection includes overvoltage, undervoltage, overcurrent, overload, overheating, encoder disconnection, motor phase loss, emergency stop interlock and braking circuit abnormality detection. Forced air cooling via an integrated cooling fan is standard, and the total unit weight is approximately 2.8 kilograms.

The primary command input relies on a 0 to ±10V analog voltage channel defaulted for speed control, which can be switched to torque command mode via parameter settings; a reserved pulse position input channel offers limited auxiliary positioning functionality. Isolated digital input terminals receive servo enable, alarm reset, positive/negative travel limit, proximity switch and CNC interlock signals. Digital output terminals utilize relay isolation to transmit servo ready, speed arrival, positioning completion and fault alarm feedback to the Yasnac host controller. A dedicated encoder terminal block handles A/B/Z differential signals and absolute encoder backup battery wiring, with exclusive shielding grounding terminals to suppress long-distance wiring interference. A built-in RS422 serial port is solely compatible with Yaskawa handheld operator panels for parameter modification, real-time operational data reading and fault history retrieval; no native industrial fieldbus interfaces are equipped at factory delivery. Power terminal blocks accommodate three-phase main power R/S/T input, U/V/W motor power output, external braking resistor expansion port and safety ground terminal, all fitted with lockable wiring structures to prevent loose connections during long-term vibration. Every analog signal circuit integrates independent common-mode filter circuits to counteract electromagnetic interference in machining workshops.

Full digital independent adjustable gains for current, speed and position closed loops, supporting one-click automatic gain tuning to eliminate mechanical low-frequency resonance without tedious manual parameter calibration. Three switchable control modes are available via parameter configuration: analog speed control as the primary mode for CNC feed axes, torque control for tension winding and compression holding processes, and auxiliary pulse position control for simple fixed-length positioning tasks. Multi-stage notch filters are embedded to eliminate mechanical oscillation during frequent high-speed acceleration and deceleration. The electronic gear function allows arbitrary gear ratio adjustment to match different 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 heavy-load rapid acceleration demands of machine tool feed axes. The built-in 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 to clear alarm status. An integrated braking circuit provides energy consumption braking during motor deceleration, and external braking resistors can be added for equipment with frequent reciprocating high-speed motion.

This servo drive is primarily paired with early-generation Yasnac CNC systems, serving medium-load feed axes on small and medium lathes, grinding machines and vertical machining centers. Secondary typical applications include textile winding and unwinding axes, indexing rotary tables for electronic assembly, miniature automated test positioning platforms, paper feeding and registration axes of printing equipment, and light-duty automated sorting conveyors. It is designed for rack installation inside enclosed electrical cabinets in indoor machining workshops. Operation in high-dust, corrosive gas, persistent high-temperature or water-splash environments is prohibited without fully sealed additional protective enclosures. As a discontinued EOL product, it is only suitable for maintenance and replacement of legacy production equipment and is not recommended for new automation project development.

Prior to power-on installation, verify the three-phase power supply voltage matches the rated specification. Separate power cables and analog signal cables completely with full shielding, and connect the encoder cable shielding layer to the dedicated drive grounding terminal. After initial installation, complete parameter initialization matching the Yasnac CNC system, run automatic gain tuning based on actual mechanical load characteristics, and adjust speed limits, torque upper thresholds 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, 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 the three-phase main power after the motor fully 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 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 the 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.