OMRON

Basic Positioning
It belongs to the OMNUC W series AC servo driver, with built-in MECHATROLINK-II high-speed motion bus communication. The rated power is 750W, the input voltage is AC 200V level (single phase / three phase 200-230V). It is an old model of bus-type servo driver from Omron. It has been discontinued and the replacement model is R88D-KN08H-ML2 (G5 series).
II. Core Function (What is a servo driver)
A servo driver is the control power supply + motion controller of a servo motor, equivalent to the “brain and amplifier” of the servo motor:
Receiving motion control instructions from the upper PLC (position / speed / torque);
Converting AC power into precise and controllable three-phase drive current to drive the corresponding R88M-W series 750W servo motor;
Real-time reading of motor encoder feedback to form closed-loop control, achieving high-precision positioning, speed regulation, and torque output;
Through the MECHATROLINK-II bus to achieve multi-axis synchronization and high-speed motion control.
Model Segmentation Interpretation
R88D: Prefix of Omron servo driver general series
WN: W series, built-in MECHATROLINK-II bus type
08: Power code = 750W (05 = 500W, 10 = 1kW)
H: Corresponding to incremental encoder servo motor model
ML2: Equipped with MECHATROLINK-II industrial motion field bus
III. Hardware Interface Correspondence (Terminal Function on the Diagram)

1. Left strong current terminals (power circuit)
   L1, L2, L3: Main power input, AC 200V single phase / three-phase power supply;
   L1C, L2C: Control power terminals, providing power for the driver board and communication circuits;
   B1/⊕, B2, B3: Regenerative braking resistor terminals, energy dissipation of the motor during deceleration to prevent overvoltage alarms;
   ⊖1, ⊖2: DC bus negative terminal;
   U, V, W: Three-phase power output of the servo motor, connected to the stator coils of the motor;
   Ground terminal: Equipment protection grounding.
2. Right signal interface (from top to bottom)
   CN6 A/B: MECHATROLINK-II bus communication port, A/B at the top are the bus input/output, multi-axis hand-to-hand series connection to the motion PLC (CJ1W-MCH71/CS1W-MCH71);
   CN3: Analog output monitoring port, can be externally connected to instruments to view real-time speed and torque;
   CN1: I/O digital signal terminals (enable, alarm reset, limit, origin, alarm output, etc., switch quantities);
   CN2: Servo motor encoder interface, connects the motor encoder cable to read position feedback;
   CNF: External operation panel / debugging software interface, can be plugged in handheld unit or computer for parameter debugging.
3. Other components
   SW1: Rotary dial switch, sets MECHATROLINK-II bus station number;
   CHARGE indicator light: Warning light for DC bus being energized upon power-on, internal still has high voltage within 5 minutes after power-off, do not disassemble or connect wires.
   IV. Core Performance and Features
   Mainly bus control
   Relying on the MECHATROLINK-II high-speed motion bus, a single bus can be connected to multiple servos, with high synchronization, simple wiring, suitable for multi-axis联动 equipment； at the same time， compatible with pulse control (CN1 terminal)， can be adapted to ordinary pulse-type PLC.
   Three control modes
   Position control： High-precision positioning (mechanical hand， conveying platform， indexing mechanism)；
   Speed control： Stable speed regulation (rolling up and down， conveyor belt)； Torque control: Constant tension control (for films, wire coils).
   High precision closed loop
   Equipped with R88M-W 750W servo motor, standard incremental encoder, position repeatability accuracy ±1 pulse, torque repeatability accuracy ±1%, quick start-stop response.
   Power supply specifications
   Input: AC 200-230V (single phase / three phase universal), rated output current 5.5A, compatible with 750W servo motor.
   Environmental adaptability
   Operating temperature: 0-55℃. No corrosive gases, no condensation in industrial environment. Suitable for machine tools and automated production lines.
   V. Typical application equipment scenarios
   This 750W bus servo is widely used in small and medium-sized automated equipment:
   Numerical control equipment: Small engraving machines, drilling machines, indexing fixtures;
   Packaging machinery: Labeling machines, cutting machines, filling positioning shafts;
   Handling mechanical hands: Single/multi-axis linear modules, transplant platforms;
   Textile / film equipment: Tension control for winding, deviation correction mechanism;
   Electronic equipment: PCB board separation machines, automatic soldering machines, screw machines;
   Lining: Precise conveying, positioning transplant mechanism.
   VI. Supplementary notes
   Production suspension information: This W series stopped accepting orders in 2013. The existing equipment is all inventory second-hand / inventory spare parts. New products are replaced with R88D-KN08H-ML2 (G5 series, performance upgrade, compatible with MECHATROLINK-II);
   Matching motor: Must be paired with the same series R88M-W08 (750W) servo motor. Cross-series mixing is not allowed;
   Safety points: Wait for 5 minutes after power off, wait until the CHARGE light is completely off before reconnecting the wires. There is a risk of electric shock from the internal high-voltage capacitor.
4. For more models, please contact via email: plcvarious@foxmail.com