CACR-SR03AB1ER is discontinued analog SERVOPACK amplifier made by Yaskawa, specially matched with Yasnac VS series CNC control system for machine tool feed axis driving, rated output power 300W (0.3kW), rated output current 3.0A. This is standard non-OEM customized model without fixed factory locked parameters, widely used on conventional CNC lathes and small vertical machining centers.

CACR-SR: Classic analog servo drive platform dedicated for Yasnac VS CNC system analog pulse control;03: Nominal rated output power 300W;A: Standard main control PCB specification;B: Revised internal power circuit layout version;1: Differential line driver pulse command input from CNC mainboard;E: Incremental encoder feedback circuit design (1500PPR standard matching);R: Standard universal housing structure without customized pin definition.

Main power input: Single-phase or three-phase AC200V, allowable working voltage range AC180V~AC230V, 50/60Hz industrial frequency.Matching servo motor: Yaskawa USAM-03, USAF-03 series 300W AC servo motor equipped with 1500PPR incremental optical encoder; default factory parameters only support 1500PPR feedback motors without parameter modification.Control structure: Full closed-loop control including current loop, speed loop and position loop; position instruction is received via differential pulse signal output from Yasnac CNC controller, supporting analog speed command alternatively by parameter setting.

Operating ambient temperature: 0℃ ~ +55℃; storage temperature: -20℃ ~ +60℃; working relative humidity ≤95% RH with no dew condensation, no corrosive gas and conductive dust around installation site. Maximum applicable installation altitude ≤1000m above sea level, enclosure protection grade IP20, must be installed inside closed electrical cabinet only, avoid liquid splash and direct sunlight exposure. Net weight of the unit is about 3.5kg.

R, S terminals are for main AC power input; U/V/W three wiring terminals connect three-phase winding of matched servo motor; extra spare terminals are reserved for external dynamic braking resistor connection for high-speed deceleration regenerative energy dissipation.CN1 is a 50-pin standard control connector, responsible for pulse position input, servo enable, servo ready output, fault alarm output and CNC interlock signal transmission, standard universal pin assignment without OEM modification.CN2 is 20-pin exclusive encoder connector, used for motor incremental encoder cable connection to transmit real-time position feedback signal. All main circuit terminals adopt screw fastening wiring structure.

Complete full wiring continuity and short-circuit inspection before energization. After switching on input power, front single-digit seven-segment LED displays standby digit if no hardware fault occurs. All default Cn series parameters are preset for standard 300W USAM/USAF servo motors; authorized maintenance technician can adjust gain and function parameters according to mechanical load requirement. After parameter revision, cut off main power for more than 3 minutes to complete internal memory data saving. Front panel physical buttons support forward/reverse jog no-load test to check motor running smoothness, abnormal noise and mechanical vibration.

Integrated comprehensive protection functions: overcurrent, overvoltage, undervoltage, continuous overload, internal overheat, encoder disconnection protection. Once protection activates, drive immediately cuts servo power output and shows corresponding fault code on front LED display.Fault code definition:Code 1: Overcurrent alarm; inspect motor winding short circuit, damaged power module or wrong power wiring;Code 2: Abnormal input supply voltage; check unstable grid voltage and power source fluctuation;Code A: Encoder disconnection fault; verify CN2 cable open circuit or loose plug terminal;Code F: Internal overheat protection; clean accumulated dust on heat sink and check cooling fan blockage or stall;Code C: Control board circuit abnormal fault, need internal PCB maintenance and component detection.Fault reset procedure: Remove fault root causes first, then cut off input power over 30 seconds and restart the servo unit.

Carry out routine maintenance every three months: clear dust on radiator and cooling fan, retighten all terminal screws, check fan rotation condition to prevent overheat shutdown. Important safety warning: high residual voltage remains inside main circuit electrolytic capacitors after power-off; wait minimum 10 minutes before opening drive casing for internal overhaul to prevent electric shock hazard.This standard CACR-SR03AB1ER can be directly replaced with identical standard model; cannot substitute Y-suffix customized versions directly due to different CN1 pin definition and pre-locked factory parameters.

Mainly used as feed axis servo amplifier for standard Yasnac VS-800 series CNC lathes and small machining centers; available to match third-party CNC equipment after parameter recalibration and wiring modification.