For example, for an A.20 alarm, the manual will tell you to measure the voltage across the regenerative resistor terminals during deceleration. If there is no voltage, the resistor is open. Chapter 5: Advanced Functions Hidden in the Manual Beyond basic operation, the Shinko servo drive manual reveals features that can transform your application. Electronic Gearing (Position Mode) This allows you to match the motor’s internal encoder resolution (e.g., 131072 pulses/rev) to any command pulse count from your controller. The formula is:
| Alarm Code | Description | Most Likely Causes (from manual) | Corrective Action | |------------|-------------|----------------------------------|--------------------| | | Undervoltage | Main power drop below 170V DC bus; undersized transformer; phase loss | Check input voltage at R/S/T; measure DC bus between P/N | | A.20 | Overvoltage | Deceleration too fast; external regenerative resistor disconnected or too small | Increase deceleration time; measure resistor ohms; check C/D? terminal | | A.30 | Regeneration error | Regenerative circuit failure; shorted transistor | Replace drive or add external regen unit per manual’s resistor table | | A.40 | Overload (Main circuit) | Mechanical jam; motor torque insufficient; gain mis-tuning | Jog motor disconnected from load; check load torque via monitor mode (Un002) | | A.41 | Overload (Electronic thermal) | Repeated peak torque > rated; long-term operation near limit | Reduce duty cycle; upgrade to larger servo system | | A.51 | Overspeed | Command frequency too high; Pn004 setting wrong; motor encoder loose | Check speed monitor; reduce command pulses; re-seat encoder connector | | A.81 | Absolute encoder error | Battery low (for absolute systems); encoder cable damaged | Replace battery with drive powered ON (as per manual warning); replace cable | | A.95 | Parameter corruption | EEPROM write interrupted; electrical noise | Reload parameter backup; perform Pn?? factory reset procedure | shinko servo drive manual
Electronic Gear Ratio (Pn100/Pn101) = (Encoder Resolution × Number of Command Pulses per Revolution) / (Load Shaft Resolution) For example, for an A
In the world of industrial automation, precision is paramount. Whether you are operating a CNC router, a packaging conveyor, a robotics arm, or a specialized textile machine, the performance of your motion control system hinges on one critical component: the servo drive. Among the trusted names in this field is Shinko , a brand renowned for its robust, high-performance servo systems. Electronic Gearing (Position Mode) This allows you to
| Parameter | Function | Typical Value | Note | |-----------|----------|---------------|------| | Pn000 | Control mode | 0 (Position), 1 (Speed), 2 (Torque) | Set according to application | | Pn001 | Rotation direction | 0 or 1 | Reverses motor without rewiring | | Pn002 | Pulse input format | 0 (Pulse + Direction), 1 (CW/CCW), 2 (Phase A/B) | Match to controller | | Pn100 | Electronic gear numerator (Pulse ratio) | Varies | See formula: (Encoder resolution / Desired pulses per revolution) | | Pn101 | Electronic gear denominator | 1 | Same as above |
By thoroughly reading and respecting your manual, you move from being a reactive maintenance person to a proactive motion control expert. You will reduce downtime, prevent costly motor/drive destruction, and unlock the full precision and torque capability that you paid for.