CACR-SR03SB1AF-Y187 is a 0.3kW original Yaskawa AC Servopack from classic CACR-SR series, OEM customized with Y187 factory program for Yasnac VS-800 CNC system. It is specially designed for feed axis driving on customized CNC lathes and small machining centers. Original production has been discontinued, and this servo unit is mainly used as replacement spare part for maintenance of aged special machine tools. It matches Yaskawa USAM series 300W incremental encoder servo motors, and the suffix Y187 stands for factory-locked customized parameters exclusive for designated machine equipment.

CACR refers to general series code of Yaskawa AC servo amplifier. SR represents universal control platform supporting speed, position and torque control via internal parameter setting. 03 means rated output power of 0.3kW. SB is dedicated 200V-class main power board with unique internal circuit design different from BB, BY and BZ specifications. 1AF stands for Type-A control board plus F-type interface circuit built for incremental encoder motors. Y187 is exclusive OEM customization code with pre-solidified internal application parameters locked at factory.

Main power supply is three-phase AC 200V~230V with voltage tolerance of +10%/-15% under 50Hz or 60Hz frequency, and independent single-phase AC 200~230V is used for control circuit power input. Rated continuous output current is 3.0Arms and peak transient overload current reaches 8.5Arms to satisfy short-time acceleration and deceleration requirements. Operating ambient temperature ranges from 0℃ to 55℃ while storage temperature is between -20℃ and 85℃, with working relative humidity no higher than 80%RH and no condensation allowed. It features IP20 protection grade and can only be installed inside control cabinet, keeping away from surroundings with corrosive gas, heavy dust and oil mist. IGBT sine-wave PWM driving technology is adopted for stable motor operation.

Three optional control modes including speed, position and torque control are available. The drive receives standard ±10VDC analog command signal from Yasnac CNC controller, yet core parameters such as gain and electronic gear ratio are pre-locked by Y187 factory program, and arbitrary parameter modification is forbidden to avoid mismatching with original machine host. The control board is equipped with anti-interference circuit to guarantee stable transmission of incremental encoder feedback signals under complex industrial workshop environment.Complete protection functions cover overcurrent, overvoltage, undervoltage, overheat, regenerative circuit failure, encoder signal loss and CPU abnormal shutdown protection. Single seven-segment digital display on front panel shows real-time operating status and numerical fault codes, and terminals P and N are reserved for external regenerative braking resistor connection.

R, S, T terminals connect three-phase input power source; U, V, W terminals link three-phase power cables of matched servo motor; PE terminal must connect reliable protective ground complying with local electrical safety regulations; P and N terminals are prepared for external brake resistor wiring.Control terminals accept ±10VDC analog instruction from CNC system, with digital input terminals for servo enable and fault reset signals, and dry-contact relay output provides external fault alarm feedback. A dedicated circular aviation connector is configured for incremental encoder wiring following AF plus Y187 customized pin definition standard.

Mount the servo drive vertically inside electrical cabinet and reserve enough clearance space at top and bottom for heat dissipation, avoiding installation near heat-generating components such as transformers and contactors. Carry out comprehensive wiring inspection before power-on to eliminate short-circuit risk. Thanks to factory pre-set locked parameters of Y187 version, large-scale parameter setup is unnecessary during regular replacement installation. Complete no-load jog test to confirm motor rotation direction and running stability before connecting mechanical load formally.

Cut off all input power and wait more than 10 minutes for residual high voltage discharge of internal capacitors before any disassembly or maintenance work to prevent electric shock hazard. Clean cooling ventilation slots and tighten terminal screws every quarter regularly. Once fault alarm code appears on display, check sequentially input power fluctuation, motor mechanical jamming, loose encoder wiring and insufficient cabinet heat dissipation, and do not restart equipment repeatedly until all hidden faults are fully eliminated. Random revision of locked Y187 customized program is strictly prohibited.