CACR-SR12TZ9SM-Y12A is a discontinued full-digital AC SERVOPACK under Yaskawa VS-800 CACR-SR series, specially matched with 1.2kW Yaskawa USAREM series servo motors for Yasnac CNC machine tools and precision automation equipment. It adopts three-loop closed-loop control architecture focused on analog speed command control, built with integrated braking power circuit and rack-mounted compact cabinet structure. This unit is designed for traditional analog host systems, featuring stable low-speed torque output, fast dynamic response and complete hardware fault protection logic. It mainly serves old-generation CNC axes, winding equipment and positioning platforms that rely on ±10V analog signal control, with robust anti-interference performance for factory workshop wiring environments.

CACR: Standard identifier of Yaskawa AC servo drive SERVOPACKSR: R sub-series, speed control-oriented servo platform for machine tool analog control system12: Rated matching motor power, 1.2kWTZ: Special hardware specification code; dedicated analog signal control circuit, reinforced noise suppression circuit, built-in power braking transistor, rack mounting structural design different from cabinet wall-mounted BB/BA models9: Internal control board hardware revision version numberSM: Encoder matching specification, compatible with 15-bit absolute incremental composite encoder signal, dedicated shielded encoder terminal layoutY12A: OEM customized variant code exclusively for Yasnac CNC system, fixed signal definition of I/O terminals, optimized communication protocol matching Yasnac motion controller, fixed industrial 200V voltage grade without regional modification

Input power adopts three-phase 200V–230V AC power supply, allowable voltage fluctuation ±10%, single-phase power input is not supported for this TZ rack model. Rated continuous output current is 7.8A, peak instantaneous output current reaches 23.4A to realize triple short-time overload torque for rapid acceleration and heavy startup load. Control loop bandwidth reaches 350Hz, supporting 15-bit absolute encoder feedback with high resolution positioning. Continuous operating ambient temperature range is 0°C to 40°C, storage temperature from -20°C to 70°C, relative humidity 5%–80% without condensation. Unit protection level is IP20, suitable for rack installation inside electrical control cabinet, vibration resistance meets machine tool industrial standard 10–1500Hz. Complete multi-layer protection functions include overvoltage, undervoltage, overcurrent, overload, overheat, encoder disconnection, motor phase loss, emergency stop interlock and braking circuit failure detection. Standard cooling mode is forced air cooling with built-in cooling fan, overall unit weight is about 2.8kg.

Main command input channel is 0 to ±10V analog voltage interface, prioritized for speed command, with parameter switchable torque control analog input; pulse position command channel is reserved but limited function, mainly for auxiliary positioning demand. Isolated digital input terminals receive servo enable, external alarm reset, positive/negative travel limit, origin sensor signal and CNC system interlock signal. Digital output terminals adopt relay isolated output, feeding back servo ready, speed reach, positioning completion and drive fault alarm status to Yasnac main controller. Dedicated encoder terminal block supports A/B/Z phase differential signal and absolute encoder battery backup wiring, equipped with dedicated shielding grounding terminals to eliminate long-distance wiring interference. Built-in RS422 serial communication port only supports Yaskawa dedicated handheld operator for parameter modification, real-time running data reading and fault record query, no standard fieldbus interface reserved as factory default. Power terminals include three-phase main power R/S/T input, U/V/W motor power output, external braking resistor expansion terminal and safety grounding terminal, all with anti-loose locking wiring structure. All analog signal circuits are equipped with independent common-mode filter circuits to adapt complex electromagnetic environment of machine tool workshop.

Full digital independent adjustable current, speed and position three closed-loop gains, supporting one-click automatic mechanical gain tuning to suppress low-frequency resonance without manual complex parameter adjustment. Three control modes can be switched via parameter: analog speed control as primary mode for CNC feed axes, torque control for tension winding and pressure holding, auxiliary pulse position control for simple fixed-length positioning. Built-in multi-stage notch filter eliminates mechanical oscillation during high-speed start-stop and variable speed operation. Electronic gear function supports arbitrary gear ratio setting to match different mechanical reduction structures without mechanical transformation. Multiple homing modes are available including dog trigger homing and Z-phase encoder signal homing, with adjustable homing speed and offset position parameters. Short-time triple rated overload torque output function meets heavy load rapid acceleration demand of machine tool feed axes. Integrated fault self-diagnosis system automatically records fault codes and pre-alarm operating data; most minor faults support remote alarm reset without power cycle, severe hardware faults require power-off reset to clear alarm state. Built-in braking circuit realizes energy consumption braking during motor deceleration, supports external braking resistor expansion for frequent high-speed reciprocating motion.

This servo drive is mainly matched with Yasnac old series CNC machine tools, applied to medium-load feed axes of small and medium machining centers, lathes and grinding machines. Other typical scenarios include textile coil winding and unwinding axes, electronic equipment indexing turntables, small automatic testing positioning platforms, printing equipment paper feeding and registration axes, and light-load automated conveying mechanisms. It adapts to indoor closed electrical cabinet rack installation environment of machinery processing workshops; it is not suitable for high-dust, corrosive gas, continuous high-temperature or humid water splash working conditions without additional airtight protection. It belongs to EOL discontinued model, mainly used for old equipment maintenance and replacement of original servo axes, and not recommended for new automation equipment development.

Before power-on installation, confirm three-phase power supply voltage matches rated specification, strictly separate power cables and analog signal cables with full shielding wiring, connect encoder shielding layer to drive dedicated grounding terminal. After initial installation, complete parameter initialization matching Yasnac CNC system, execute automatic gain tuning according to mechanical load characteristics, adjust speed limit, torque upper limit and soft start-stop parameters to reduce machine tool mechanical impact. During daily operation, judge running state through front panel LED indicators: steady green light means normal servo operation, flashing red light represents fault alarm code display. General workshop environment requires maintenance cycle every two months: clean built-in cooling fan and air duct to remove accumulated dust blocking heat dissipation, check all wiring terminals for looseness, inspect encoder cable sheath for abrasion and battery backup voltage of absolute encoder. When fault occurs, record fault code first, cut off three-phase main power supply after motor completely stops, then check wiring short circuit, mechanical jamming and encoder failure according to fault definition. For long-term equipment shutdown, disconnect main power supply; wait more than 30 minutes before re-powering to avoid internal circuit condensation short circuit. Do not disassemble internal power module and control board without professional maintenance authorization; high-voltage residual charge exists inside after power cut, wait at least 10 minutes before opening drive housing for inspection. Avoid frequent repeated power-on and power-off within short intervals to protect internal rectifier circuit and braking transistor. Replace built-in cooling fan immediately once abnormal noise or slow rotation occurs to prevent overheat shutdown fault. Store spare drives in dry constant temperature warehouse with moisture-proof packaging to prevent circuit board oxidation and encoder circuit failure.