CACR-SR05AA2AH-Y328 is an OEM locked customized 0.5kW AC servo amplifier of Yaskawa classic CACR-SR series, specially developed to cooperate with YASNAC VS-800 CNC system and vintage Toyoda CNC lathes and small machining centers. It is matched with Yaskawa USAREM series 500W incremental encoder servo motors. Original production has been discontinued, and this model is only circulated as replacement spare part for maintenance and overhaul of aging CNC machine tools. The suffix Y328 stands for exclusive factory pre-programmed and locked OEM firmware customized for specific machine tool configuration.

CACR is the fixed series prefix of Yaskawa AC SERVOPACK servo drive. SR represents multi-function control platform supporting speed, position and torque three optional control modes through internal parameter setup. 05 refers to rated output power of 0.5kW. AA means standard mainboard built with ±10VDC analog command input circuit designed for VS-800 CNC under AC200V voltage specification. Digit 2 indicates dedicated signal processing circuit for 1500P/R incremental rotary encoder. AH is the standard terminal layout of this hardware version. Y328 is exclusive OEM firmware code; core parameters including servo loop gain and electronic gear ratio are pre-calibrated and locked at factory, prohibiting arbitrary user modification.

Main power input is three-phase AC200V~230V, 50/60Hz with voltage tolerance +10%/-15%, and control power is supplied by independent single-phase AC200V~230V. Rated continuous output current is 4.2Arms and instantaneous peak overload current reaches 11.0Arms to satisfy rapid acceleration and deceleration dynamic load requirements. CN1 connector receives ±10VDC analog speed and position command from VS-800 CNC controller; CN2 feedback interface is only compatible with incremental encoders and cannot connect serial absolute encoders. The drive adopts natural air cooling with IP20 protection grade and must be installed inside electrical control cabinet. Operating ambient temperature ranges from 0℃ to 55℃, storage temperature ranges from -20℃ to 85℃, working humidity ≤80%RH without condensation, and maximum applicable installation altitude is below 1000 meters above sea level.

All parameters under Y328 customized firmware are factory locked, and unauthorized parameter modification will cause positioning deviation, motor runaway or mechanical origin loss faults. Comprehensive built-in protection functions include overcurrent, overvoltage, undervoltage, overheat, encoder disconnection, overload and regenerative circuit fault protection to guarantee stable long-term running. Compact rack-mounted design enables convenient cabinet installation and quick on-site spare replacement during equipment repair. With incremental encoder matching, homing operation is required after each power restart, which is different from absolute encoder servo products. Standard CACR-SR05AA2AH without Y328 suffix cannot directly replace this model due to unique fixed OEM parameters.

It is mainly used for feed axis replacement and breakdown maintenance of vintage Toyoda CNC lathes and small machining centers equipped with YASNAC VS-800 control system, also suitable for servo retrofit of small customized precision automation equipment adopting ±10VDC analog control and incremental encoder feedback.