1. Product Introduction

CACR-PR30BCAF is a high-performance analog servo drive manufactured by YASKAWA, belonging to the classic CACR-PR series servo control units designed for small to medium power precision motion control. This drive adopts closed-loop vector control architecture, matched with YASKAWA standard AC servo motors, delivering stable torque output, fast response speed and low speed fluctuation. It integrates power drive, position loop, speed loop and current loop control circuits in one compact unit, supporting analog command signal input for traditional automation equipment retrofits and standard new machine assembly. The whole unit features compact mechanical size, strong anti-interference capability and wide voltage adaptability, meeting continuous long-hour industrial operation requirements under moderate load fluctuation conditions.

2. Model Code Explanation

CACR stands for YASKAWA general AC servo driver series code; PR represents analog control type with analog voltage command input for position and speed regulation; 30 indicates the rated power matching specification corresponding to 3.0kW servo motor matching capacity; B refers to the main circuit power supply specification for three-phase AC input; C denotes built-in standard brake circuit without external braking unit required for conventional load; A is the control circuit standard version with default analog signal interface layout; F represents industrial grade coating and reinforced electromagnetic shielding for factory harsh environment use.

3. Technical Specifications

The rated matching motor power of this drive is 3.0 kilowatts. Main circuit input supports three-phase alternating current ranging from 200V to 230V, with allowable input voltage fluctuation range of minus 10 percent to plus 10 percent of rated voltage. Control circuit adopts single-phase AC 100V to 240V independent power supply to avoid control signal disturbance caused by main circuit voltage drop. Rated output current reaches 18 amperes, peak instantaneous output current is 54 amperes lasting for short-time acceleration and deceleration stages. Speed control range covers zero speed up to 4500 revolutions per minute of matched servo motor, speed adjustment ratio reaches 1 to 10000, speed fluctuation rate is controlled below 0.03 percent under constant load. Position control pulse input maximum frequency supports 500 kilohertz, position loop response bandwidth can be adjusted within 100 to 800 hertz. Built-in regenerative brake resistor circuit bears standard braking energy dissipation for normal start-stop cycle, overcurrent protection threshold set at 150 percent of rated output current, overvoltage protection triggers when DC bus voltage exceeds 320 volts, undervoltage protection activates when DC bus voltage drops below 170 volts. Operating ambient temperature ranges from zero degree Celsius to 55 degrees Celsius, storage temperature range is minus 20 degrees Celsius to plus 70 degrees Celsius, applicable relative humidity is 5 percent to 90 percent without condensation, anti-vibration performance withstands vibration intensity of 0.5g within frequency band 10 to 200 hertz.

4. Interface and Communication Configuration

Control signal terminal block provides full analog and digital signal interfaces. Analog command interfaces include plus and minus 10 volt analog speed command input, plus and minus 10 volt analog torque command input, separate analog speed feedback monitoring output and torque monitoring output for external meter observation. Digital input terminals accept forward rotation enable, reverse rotation enable, alarm reset, zero clamp, gain switching and position deviation clear signals, all supporting NPN or PNP open collector input mode with 24 volt signal level. Digital output terminals output servo ready signal, speed reach signal, position positioning completion signal, fault alarm signal and brake control signal for external relay drive. Pulse position command interface supports three pulse input modes including line driver differential pulse, open collector single-ended pulse and phase A/B orthogonal pulse input. Standard communication interface is RS232 serial port reserved on control panel, exclusively used for local parameter setting, real-time data reading and fault record query via YASKAWA dedicated debugging software; no fieldbus communication card is pre-installed, additional optional communication modules are required if PROFIBUS or DeviceNet bus communication functions are needed. Motor connection interface adopts dedicated four-core power cable connector and separate encoder feedback connector, encoder channel supports 2500 line incremental encoder signal receiving with differential signal transmission to resist electromagnetic interference.

5. Core Functions

The drive integrates three closed-loop control loops including current loop, speed loop and position loop with independent adjustable gain parameters for each loop to optimize dynamic response and stationary positioning precision separately. Multi-stage electronic gear ratio function allows arbitrary setting of command pulse number corresponding to motor rotation circle to simplify mechanical transmission matching without modifying mechanical structure. Built-in multi-segment position table function stores up to 16 groups of fixed position target values, realizing automatic fixed-point motion triggered by external digital input signals without upper controller continuous pulse output. Electronic cam function generates continuous variable speed motion curve based on preset position curve data, replacing mechanical cam structures for repetitive profiling movement. Built-in multiple protection functions cover overcurrent, overvoltage, undervoltage, overload, motor overheat, encoder disconnection, main circuit fuse blow, control circuit abnormal and excess position deviation alarm, each fault code is stored in internal memory for later troubleshooting. Automatic gain adjustment function completes one-click parameter self-tuning according to actual load inertia, automatically matching loop gain to eliminate manual complex parameter debugging. Zero-speed clamping function maintains stable motor holding torque when command speed is zero to prevent workpiece position offset under external disturbance. Soft start and soft stop function limits acceleration and deceleration torque change rate to reduce mechanical impact and extend service life of transmission components such as bearings and couplings.

6. Applicable Scenarios

This servo drive is suitable for medium power precision analog motion control equipment relying on analog voltage or pulse command signals. It can be equipped on precision metal cutting lathes and small grinding machines to achieve stable constant torque cutting and high-precision workpiece positioning. It matches automated stamping feeding equipment, plastic molding take-out manipulators and textile winding machinery for continuous high-speed reciprocating feeding and winding tension control. It applies to packaging automation equipment including labeling machines, carton sealing machines and filling machines to complete fast fixed-distance positioning and smooth speed regulation. It fits laboratory precision test benches, electronic component sorting equipment and small laser processing platforms requiring low speed stable operation and micro-positioning accuracy. It is also widely used in traditional old automation equipment renovation projects, where original analog control systems need servo upgrade without replacing upper analog controllers. It adapts to production lines with moderate start-stop frequency and medium inertia load, not recommended for ultra-high speed ultra-short cycle rapid reciprocating equipment or heavy-duty large inertia metal forging machinery with long-time large braking energy release.

7. Operation and Maintenance Instructions

Operation Guidelines

Complete wiring inspection before power on, verify correct connection of main power cable, encoder feedback cable and control signal cable, confirm no short circuit between power terminals and shielding layer grounding is reliably connected to equipment cabinet ground bar. Set basic motor matching parameters including motor rated power, rated current and encoder resolution first after initial power on, then execute load inertia auto-tuning program under no-load state. Adjust speed loop and position loop gain step by step after auto-tuning, avoid excessive gain which causes mechanical resonance and vibration. Do not operate the drive beyond rated voltage, rated current and continuous load torque range; reduce operation load when ambient temperature exceeds 45 degrees Celsius to avoid overload alarm. Cut off main circuit power supply first then control power supply when stopping long-term operation, wait at least ten minutes for internal DC bus capacitor complete discharge before disassembling wiring to prevent electric shock hazard. Avoid frequent continuous power on and power off within short intervals, keep power on interval longer than three minutes to protect internal power module.

Maintenance Instructions

Carry out regular dust removal maintenance every one to three months according to on-site dust concentration, blow off accumulated dust on drive heat sink and internal circuit board with dry compressed air of low pressure, prohibit using liquid cleaning agents to wipe circuit components. Check cable connectors and terminal blocks every six months, fasten loose screws to prevent poor contact caused by vibration, inspect power cable insulation layer for aging or cracking and replace damaged cables timely. Verify heat dissipation fan operation status monthly, replace fan immediately if abnormal noise or stop rotation occurs to avoid power module overheating damage. Back up all parameter settings via debugging software every six months to prevent parameter loss after unexpected fault reset. Regularly check grounding wire continuity and grounding resistance to ensure electromagnetic shielding effect and reduce signal interference fault probability. Store spare drives in dry constant temperature environment with moisture-proof packaging if not in use for long time, avoid storage in high humidity and corrosive gas space. Do not disassemble internal power module and control circuit board without professional maintenance authorization; send the whole unit to official YASKAWA maintenance center when permanent fault occurs such as power module breakdown and main board burnout.