CACR-SR03BC1ES is original Japanese Yaskawa AC Servopack from the classic CACR-SR series with rated power 0.3kW. It is developed to cooperate with Yasnac VS-800 CNC system and commonly used as feed axis driver on conventional CNC lathes and small machining centers. Original production has been discontinued, and this unit is mainly supplied as replacement spare part for old equipment overhaul. It is matched with Yaskawa USAM and USAF series 300W incremental encoder servo motors. The ES stands for exclusive customized control board with dedicated encoder processing circuit and fixed internal application parameters.

CACR is general model code for Yaskawa AC servo amplifier. SR means basic speed control platform supporting switchable position and torque control via parameter configuration. Number 03 refers to 0.3kW rated output capacity. BC1 defines main power board specification for 200V input grade with unique internal power circuit layout different from BB1 version. ES represents special control board design featuring enhanced anti-interference encoder signal circuit and fixed signal definition which differs from AM, CS and HS variants.

Main power source is three-phase AC 200V~230V with voltage tolerance +10%/-15%, applicable for 50Hz and 60Hz frequency. Control circuit adopts independent single-phase AC 200V~230V power supply. Rated continuous output current is 3.0Arms, and instantaneous peak overload current reaches 8.5Arms to satisfy short-time acceleration and deceleration demand.Working ambient temperature ranges from 0℃ to 55℃, storage temperature is between -20℃ and 85℃. Operating humidity shall not exceed 80%RH without dew condensation. Protection class is IP20 and the drive can only be installed inside control cabinet; working surroundings with corrosive gas, heavy dust and oil mist are not allowed. IGBT sine-wave PWM driving structure is adopted for smooth motor operation.

Speed, position and torque three kinds of control modes are available for selection. Part of core parameters are preset according to ES version factory standard to match Yasnac CNC system, and random parameter modification is not recommended. The ES control board is optimized for encoder anti-jamming performance to adapt harsh industrial workshop environment.Full set of protective functions is equipped including overcurrent, overvoltage, undervoltage, overheat, regenerative circuit abnormality, encoder signal loss and CPU malfunction protection. Single digital seven-segment display on front panel shows real-time operating status and numerical fault codes for convenient troubleshooting. P and N terminals are reserved for external regenerative braking resistor connection for frequent start-stop working condition.

R, S, T terminals connect three-phase AC input power; U, V, W terminals link three-phase winding of matched servo motor; PE terminal needs reliable earthing complying with local electrical safety codes; P and N terminals are prepared for external brake resistor wiring.Control terminal area accepts ±10VDC analog command signal from VS-800 CNC controller. Digital input terminals are used for servo enable and fault reset signals, while dry-contact relay output provides external fault alarm signal feedback. Special circular aviation connector is configured for encoder wiring following ES customized pin definition.

Mount the servo unit vertically inside electrical cabinet, reserve enough top and bottom space for heat dissipation and avoid placing beside heat sources like transformers and contactors. For multiple drives installed in one cabinet, forced air cooling is required.Check all power and control wiring completely before power-on to avoid short-circuit damage. Standard factory parameters are stored inside ES model, no large-scale parameter setting needed during regular replacement. Perform no-load jog test to confirm motor rotating direction and running stability before connecting mechanical load.

Cut off total power supply and wait more than 10 minutes for internal capacitor residual high voltage discharge before any maintenance work to prevent electric shock accident. Periodically clean dust on cooling slots and tighten terminal screws every three months to avoid poor contact caused by long-time vibration.When alarm code pops up, check items in order: unstable input voltage, mechanical blocking or overload of servo motor, loose encoder cable and poor cabinet heat dissipation. Stop repeated startup until fault source is eliminated.