Description
Product Parameters
- Model Number: GPAR-24NB1-A
- Manufacturer: Waco Giken (Wacogiken)
- Series: GPAR Series (High-performance AC Servo)
- Input Voltage: AC 200V–230V, 50/60Hz
- Output Current: Rated for precision torque and velocity control
- Control Mode: Position, Speed, and Torque control capabilities
- Feedback Interface: Supports high-resolution encoder feedback
- Safety Features: Overcurrent, Overvoltage, and Overheat protection
- Mounting Type: Panel mount with integrated heat sink
- Application: Industrial robotics, semiconductor manufacturing, and high-precision CNC machinery
The Waco Giken GPAR-24NB1-A is a specialized AC servo drive engineered for high-dynamic response and extreme positioning accuracy in automated environments. Its robust architecture and advanced control algorithms allow for seamless integration with complex motion controllers, ensuring smooth operation even under fluctuating load conditions typical of high-speed manufacturing lines.
Differences from Similar Models
The GPAR-24NB1-A is distinguished from other variants in the Waco Giken lineup by several key hardware and software specifications:
- Current Capacity: The “24” designation typically signifies a higher power or current rating compared to the GPAR-12 or GPAR-15 series, allowing it to drive larger motors with higher torque requirements.
- Input Phase: Unlike “NB3” models which may require three-phase power for maximum efficiency, the “NB1” suffix often indicates optimization for specific single-phase or specialized power input configurations common in modular control cabinets.
- Control Loop Speed: The “A” revision features an upgraded processor capable of faster sampling rates for the velocity loop compared to the standard GPAR-24NB1, resulting in reduced settling time and less vibration.
- Form Factor: This model utilizes a more compact footprint than older GPAR series units, designed specifically for high-density DIN rail or rack mounting where space is a premium.

Product Operation Tips
- Proper Grounding: Ensure the drive is grounded to a common bus bar using a short, thick wire. This is critical for the GPAR series to prevent electrical noise from interfering with the high-sensitivity encoder signals.
- Parameter Backup: Before modifying any tuning constants, use the communication port to back up the original factory parameters. This allows for a quick recovery if the auto-tuning process yields unstable motor oscillations.
- Cooling Clearance: Maintain at least 50mm of vertical clearance above and below the unit. The GPAR-24NB1-A relies on natural convection or internal fans that require unobstructed airflow to prevent thermal shutdown during high-duty cycles.
- Check Encoder Coupling: If the drive reports a feedback error, check the physical coupling between the motor and the load. The high gain of this drive can detect micro-slips that other drives might ignore, leading to “Position Deviation” alarms.

