CACR-SR05AA2AH-Y318 is an OEM locked customized 0.5kW AC servo amplifier from Yaskawa classic CACR-SR series, specially tailored for YASNAC VS-800 CNC system and vintage Toyoda CNC lathes and small machining centers. It is designed to pair with Yaskawa USAREM series 500W incremental encoder servo motors. Original production has been discontinued, and this model is only available as replacement spare part for overhaul and maintenance of aging CNC equipment. The suffix Y318 refers to exclusive factory pre-programmed fixed OEM firmware configured for specific machine tool requirements.

CACR is the fixed series prefix of Yaskawa AC SERVOPACK drive. SR represents universal control platform supporting speed, position and torque three optional control modes via internal parameter configuration. 05 stands for rated output power of 0.5kW. AA means standard mainboard integrated with ±10VDC analog command input circuit matching VS-800 CNC under AC200V voltage grade. Digit 2 denotes dedicated feedback circuit for 1500P/R incremental rotary encoder. AH indicates standard terminal definition of this hardware specification. Y318 is special OEM firmware code; core parameters including servo loop gain and electronic gear ratio are pre-calibrated and locked at factory without user modification permission.

Main power input is three-phase AC200V~230V, 50/60Hz with voltage tolerance of +10%/-15%, while control power adopts independent single-phase AC200V~230V power supply. Rated continuous output current is 4.2Arms and instantaneous peak overload current reaches 11.0Arms to meet dynamic demands of rapid acceleration and deceleration. CN1 port receives ±10VDC analog speed and position instruction from VS-800 CNC controller, and CN2 feedback interface only supports incremental encoders and is incompatible with absolute encoders. The servo uses natural air cooling with IP20 protection grade and shall be installed inside control cabinet only. Operating ambient temperature ranges from 0℃ to 55℃, storage temperature ranges from -20℃ to 85℃, working humidity is no higher than 80%RH without condensation, and maximum applicable installation altitude is below 1000 meters above sea level.

All internal matching parameters of Y318 customized program are factory locked; unauthorized parameter adjustment will lead to positioning deviation, motor runaway or mechanical origin missing faults. Comprehensive built-in protection functions include overcurrent, overvoltage, undervoltage, overheat, encoder disconnection, overload and regenerative circuit fault protection to ensure long-term stable operation. Compact rack-mounted structure enables convenient cabinet installation and fast on-site spare replacement during equipment maintenance. Equipped with incremental encoder, the machine needs homing operation after every power-on, which differentiates it from absolute encoder servo models. Standard CACR-SR05AA2AH without Y318 marking cannot directly substitute this model due to exclusive fixed parameters.

It is mainly applied for feed axis replacement and breakdown maintenance of legacy Toyoda CNC lathes and small machining centers equipped with YASNAC VS-800 system, as well as servo modification of small customized precision automation equipment with ±10VDC analog control and incremental encoder feedback.