1. Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of the KB Electronics KBMA-24D Hybrid AC Drive. The KBMA-24D is designed to convert single-phase AC input power into three-phase AC output power, suitable for controlling 3-phase motors up to 1 horsepower.
2. Safety Information
WARNING: Electrical shock hazard. Installation and servicing should only be performed by qualified personnel. Disconnect all power before working on the drive or motor.
- Always ensure the power supply matches the drive's input voltage requirements.
- Do not operate the drive with damaged wiring or enclosure.
- Ensure proper grounding to prevent electrical hazards.
- Avoid touching internal components when power is applied.
- The drive may remain energized for a short period after power is removed. Allow sufficient time for capacitors to discharge before handling.
3. Product Features
- Motor Horsepower Range: 1/8 (.09) to 1.0 (.75) HP (Kw).
- Input Power: Jumper selectable 1-Phase 115/230 VAC, 50/60 Hz.
- Output Power: 3-Phase 230 VAC.
- Enclosure: Rugged Aluminum NEMA-1 / IP-50 rated.
- Starting Torque: Provides 200% starting torque.
- Control: Integrated On/Off AC Line Switch.
- Diagnostics: Equipped with Diagnostic LED Status Indicators.
- RFI Filter: Class "A" (CE) RFI Filter for electromagnetic compatibility.
- Speed Regulation: Flux Vector Compensation with Static Auto-Tune for excellent speed regulation.
- Energy Efficiency: Auto energy saving at light loads.
- Protection: Electronic Inrush Current Limit (EICLTM), Undervoltage, Overvoltage, Short Circuit, and Regeneration Protection.
- Relay Output: Run/Fault Relay Output Contacts.
- Holding Torque: Maintains holding torque at zero speed in "Stop" mode.
- Adjustments: Basic Programmable Trimpot Adjustments for fine-tuning.
- Agency Approvals: UL, CE, CSA, C-Tick.
4. Specifications
| Parameter | Value |
|---|---|
| Model | KBMA-24D |
| Part Number | 9533 |
| Horsepower (HP) | 1/8 to 1.0 |
| Input Phase | 1-Phase |
| Input Voltage | 115/230 VAC (Jumper Selectable) |
| Input Frequency | 50/60 Hz |
| Output Phase | 3-Phase |
| Output Voltage | 230 VAC |
| Enclosure Rating | NEMA-1 / IP-50 |
| Dimensions (L x W x H) | 7.00" x 4.95" x 4.15" (17.8 x 12.7 x 10.7 cm) |
| Item Weight | 2.74 pounds |
| Approvals | UL, CE, CSA, C-Tick |
5. Installation and Setup
Before beginning installation, ensure all power is disconnected from the circuit. The KBMA-24D drive is housed in a NEMA-1 / IP-50 enclosure, suitable for indoor use where protection against dust and light splashing is required.
5.1 Mounting
Mount the drive securely to a flat, stable surface using appropriate fasteners. Ensure adequate ventilation around the unit to prevent overheating.
5.2 Wiring
The KBMA-24D requires a single-phase input and provides a three-phase output. Refer to the internal wiring diagram (typically found inside the enclosure cover) for precise connections.
- Input Power Connection: Connect the 1-Phase 115 VAC or 230 VAC supply to the designated input terminals. The drive features jumper-selectable input voltage. Verify the correct jumper setting for your supply voltage before applying power.
- Motor Connection: Connect the 3-Phase motor to the designated output terminals. Ensure the motor is rated for 230 VAC 3-Phase operation.
- Grounding: Connect the ground terminal of the drive to a reliable earth ground.
Note: Optional accessories such as a Forward-Stop-Reverse switch or a Signal Isolator/Auto-Manual switch can be integrated. Consult the specific accessory documentation for wiring instructions.
Figure 1: Front-angle view of the KBMA-24D Hybrid AC Drive, showing the speed control dial, FWD/STOP/REV buttons, and ON/OFF switch.
Figure 2: Front panel view of the KBMA-24D Hybrid AC Drive, highlighting the control interface including the speed potentiometer and power switch.
5.3 Initial Configuration (Trimpot Adjustments)
The drive features basic programmable trimpot adjustments for fine-tuning performance. These typically include settings for minimum/maximum speed, acceleration/deceleration rates, and other motor control parameters. Refer to the detailed instructions provided with the unit for specific trimpot functions and adjustment procedures.
6. Operation
Once properly installed and configured, the KBMA-24D is straightforward to operate.
- Power On: Use the integrated On/Off AC Line Switch to apply power to the drive. Diagnostic LEDs will illuminate to indicate operational status.
- Motor Start/Stop: The drive typically includes FWD (Forward), STOP, and REV (Reverse) buttons or terminals for motor control. Press FWD to start the motor in the forward direction, STOP to halt the motor, and REV to start in reverse (if enabled and wired).
- Speed Control: Adjust the speed control potentiometer (dial) on the front panel to vary the motor's speed. The drive's Flux Vector Compensation ensures stable speed regulation across the operating range.
- Diagnostic LEDs: Observe the diagnostic LEDs for operational status and fault indications. Consult the troubleshooting section for interpreting LED patterns.
7. Maintenance
The KBMA-24D is designed for reliable operation with minimal maintenance. Regular inspection can help ensure longevity and performance.
- Cleaning: Periodically clean the exterior of the enclosure to prevent dust buildup, especially around ventilation openings. Use a soft, dry cloth. Do not use liquid cleaners directly on the unit.
- Inspection: Annually inspect wiring connections for tightness and signs of wear or damage. Check for any unusual noises or excessive heat during operation.
- Environment: Ensure the operating environment remains within the specified temperature and humidity ranges for the drive.
8. Troubleshooting
The KBMA-24D includes diagnostic features to assist in identifying operational issues. Refer to the diagnostic LED indicators for initial fault assessment.
| Symptom | Possible Cause | Action |
|---|---|---|
| Drive does not power on | No input power, faulty switch, incorrect wiring. | Check power supply, verify AC line switch position, inspect input wiring. |
| Motor does not start | Motor not connected, fault condition (e.g., overvoltage, undervoltage, short circuit), incorrect control signal. | Check motor wiring, observe diagnostic LEDs for fault codes, verify start command. |
| Motor runs erratically | Incorrect trimpot settings, motor overload, poor connections. | Review trimpot adjustments, check motor load, inspect all wiring connections. |
| Diagnostic LED indicates fault | Specific fault condition (e.g., overvoltage, short circuit, EICLTM protection). | Consult the drive's detailed manual for specific LED fault codes and corresponding corrective actions. Address the underlying cause of the fault. |
For persistent issues or complex problems, contact KB Electronics technical support.
9. Warranty and Support
KB Electronics products are manufactured to high standards and are typically covered by a manufacturer's warranty against defects in materials and workmanship. For specific warranty terms, duration, and claim procedures, please refer to the documentation included with your product or visit the official KB Electronics website.
For technical assistance, troubleshooting support, or inquiries regarding parts and service, please contact KB Electronics customer service directly. Contact information can usually be found on the product packaging or the manufacturer's website.