Yaskawa CACR-SR20BB1BM Digital Servo Drive
May 29, 2026

Yaskawa CACR-SR20BB1BM Digital Servo Drive

The CACR-SR20BB1BM is a 2.0 kW digital AC servo drive of Yaskawa CACR-SR (VS-800) series, designed for traditional CNC machine tools and high-precision industrial automation systems. It adopts built-in forced air cooling, with 18.8 A continuous current and 45 A short-term peak current. Equipped with absolute encoder interface and universal base firmware, this drive features reliable position retention and wide system compatibility, suitable for equipment requiring accurate absolute position detection and stable servo operation.

Description

Model Definition

CACR: AC servo drive (SERVOPACK) product family
SR: VS-800 series for integrated speed and position control
20: 2.0 kW rated output power
B: Three-phase 200–230 VAC main power supply specification
B: Standard general-purpose hardware configuration
1: Single-phase 200–230 VAC control power supply
B: Standard analog control interface
M: Absolute encoder signal interface for motor feedback

Technical Specifications

Electrical Parameters

Main power supply: 3-phase 200–230 V AC, tolerance -15% to +10%, 50/60 Hz
Control power supply: 1-phase 200–230 V AC, tolerance -15% to +10%, 50/60 Hz
DC bus voltage: Internal integrated DC bus circuit
Continuous output current: 18.8 A
Peak output current: 45 A for short-time operation
Output frequency range: 0 Hz to 400 Hz
Power dissipation: Approximately 150 W
Compatible motors: Yaskawa S-series servo motors equipped with absolute encoders

Mechanical & Environmental Parameters

Cooling method: Built-in forced air cooling with internal fan
Protection class: IP20 for the whole unit
Operating temperature: 0 °C to +55 °C
Storage temperature: -20 °C to +85 °C
Maximum installation altitude: 1000 m, 1% performance derating per 100 m above 1000 m
Vibration resistance: 0.5 g (10–60 Hz), 0.2 g (60–200 Hz)
Dimensions (H×W×D): 380 mm × 150 mm × 200 mm
Weight: Approximately 6.0 kg

Interface and Communication Configuration

Motor feedback: CN2 interface supporting absolute encoder signals
System bus: Internal bus design for signal transmission
Main power interface: R, S, T for main power input, L1, L2 for control power input, U, V, W for motor output
Regenerative interface: P, B terminals for external regenerative resistor connection
Control I/O: CN1 50-pin interface with multiple isolated digital inputs and outputs
Analog interface: ±10 V DC analog command input and speed monitoring output
Communication: RS232 and RS485 interfaces supporting Modbus RTU protocol
Display unit: Seven-segment LED display for operating status and alarm codes

Core Functions

Current, speed and position three-loop control ensures stable and high-precision motion performance.
Absolute encoder interface keeps real position data after power off without repeated homing operation.
Standard analog control interface and universal hardware deliver excellent compatibility with mainstream control systems.
Complete protection against overvoltage, undervoltage, overcurrent, overheating, encoder fault and overload.
Supports torque, speed and position control modes to meet various working conditions.
Compact vertical structure adapts to standard industrial control cabinet installation.
Mature hardware design ensures long-term continuous operation in industrial environments.

Application Scenarios

Legacy CNC lathes, milling machines and machining centers using absolute encoder servo systems
Automation equipment requiring power-off position retention and no repeated homing
Rotary positioning tables, material handling and high-precision conveying equipment
VS-800 series servo system replacement and production line renovation projects
General industrial machinery with high requirements for positioning accuracy and operational efficiency

Usage and Maintenance

Maintain smooth air circulation inside the cabinet to guarantee heat dissipation effect.
Keep ambient temperature within the standard range to prevent performance decline.
Complete wiring of power, feedback, control and communication circuits before power-on.
Verify the connected motor is matched with absolute encoder to ensure normal operation.
Clean heat dissipation components and air passages every six months, and inspect terminal connections regularly.
Calibrate control loops, feedback signals and communication status once a year to maintain long-term stable operation.


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