FANUC A06B-6088-H226#H500 Alpha Spindle Amplifier Module
SPM-26 | Type 1 Interface | Input 283-325 VDC | Output 230 VAC / 111A | Alpha aP40 / Model 26 Spindle Motor | 200V Series | Internal PCBs: A16B-2202-0432 + A20B-1006-0482
Performance Enhancement in the FANUC Alpha Series
The A06B-6088-H226#H500 represents a significant step up from the SPM-22 in the A06B-6088 series, delivering 111A rated output current compared to the SPM-22's 95A. This 17% increase in available current makes the H226 the ideal module for FANUC Alpha spindle motors requiring enhanced continuous torque and higher transient capacity.
Designated as SPM-26, this mid-range unit is typically paired with FANUC Alpha Model 26 and aP40 spindle motors, commonly found on horizontal and vertical machining centers demanding superior metal-removal capability during extended production cycles.
Technical Specifications
| Part Number | A06B-6088-H226#H500 |
| Series | FANUC Alpha SPM (Spindle Amplifier Module) |
| Model Designation | SPM-26 |
| Interface Type | Type 1 |
| DC Link Input Voltage | 283-325 VDC |
| AC Output Voltage (Max) | 230 VAC |
| Rated Output Current | 111 A |
| Applicable Motors | FANUC Alpha Model 26 / aP40 AC spindle motors |
| Feedback Interface | Standard Alpha sensor (M / MZ / magnetic sensor, position coder) |
| Control PCB | A16B-2202-0432 |
| Power PCB | A20B-1006-0482 |
| External Cooling Fan | A90L-0001-0335/B |
| Internal Cooling Fan | A90L-0001-0422 |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | −20°C to +60°C |
| Reference Manual | B-65162 |
| Related Versions | #H500, #H501, #500CS (software variants -- not interchangeable) |
| Previous Module in Series | A06B-6088-H222 (SPM-22, 95A) |
| Next Module in Series | A06B-6088-H230 (SPM-30) |
H226 vs. H222: Performance Comparison
While both the SPM-22 (A06B-6088-H222) and SPM-26 (A06B-6088-H226) share the same control PCB (A16B-2202-0432) and Type 1 interface architecture, the critical difference lies in the power stage. The H226 utilizes the A20B-1006-0482 power board, supporting the higher 111A continuous output rating required for larger Alpha spindle motors.
This enhanced current capacity enables the SPM-26 to sustain torque demands during prolonged cutting operations with large-diameter face mills, heavy boring operations, or high-feed threading cycles in tough materials, preventing overload alarms and ensuring continuous operation.
Motor Compatibility
The A06B-6088-H226#H500 is specifically designed for FANUC Alpha Model 26 and aP40 spindle motors - mid-range AC spindle motors commonly specified for machining centers in the 15-30 kW spindle power class. The aP40 motor, in particular, was a preferred choice for aerospace, mold and die, and general job shop applications.
The Type 1 sensor interface supports M sensor, position coder, and magnetic sensor feedback options, providing full compatibility with FANUC 0, 6, 10, 11, 15, 16i, 18i, and 21i CNC controls.
Power Regeneration System
The Alpha module family features power source regeneration capability, allowing braking energy from spindle motors to return to the power supply line rather than dissipating as heat. For the H226 module, this system-level function distributed between the SPM and Power Supply Module (PSM) reduces heat generation in the cabinet and lowers overall energy consumption during production cycles.
Internal Circuit Board Configuration
A16B-2202-0432 Control PCB
Handles serial communication with CNC, current command generation, alarm monitoring, NVRAM parameter storage, and front-panel display functionality. Communication-related alarms (AL-24, AL-25) and CPU/memory alarms (AL-13, AL-16, AL-17, AL-18) typically point to this board.
A20B-1006-0482 Power PCB
Manages DC-to-AC power conversion, containing gate drive circuits for IGBT transistors, DC bus sensing, current measurement, and hardware protection circuits. Alarms 3, 9, 11, 12, and 30 typically indicate issues with the power stage components.
Common Alarm Codes and Diagnostics
AL-01 (Motor Overheat): Check spindle motor thermal switch, cooling fan, and ventilation path
AL-03 (Fuse on DC Link Blown): Investigate overcurrent events in power stage before fuse replacement
AL-09 (Overheat Power Semiconductors): Verify external and internal cooling fan operation and cabinet airflow
AL-12 (Overcurrent in Power Circuit): Remove U/V/W motor leads and command spindle to isolate fault location
AL-24 / AL-25 (Serial Transfer Error / Stop): Diagnose serial link cable and connectors first, then control PCB if needed
Software Version Compatibility
The #H500 suffix indicates specific firmware on the control PCB affecting spindle parameter compatibility and function behavior. Available versions include #H500 (original), #H501 (revised software), and #500CS (special specification). Exact suffix matching is essential for replacement units to avoid parameter mismatches and unexpected spindle behavior.
Frequently Asked Questions
What spindle motor is the A06B-6088-H226#H500 designed to drive, and can it replace the SPM-22 (H222) in an existing installation?
This module is specified for FANUC Alpha Model 26 and aP40 spindle motors requiring 111A rated output current. While substituting H226 for H222 in machines with smaller motors is technically possible, it requires parameter verification to ensure motor data matches the connected motor. Using H222 where H226 is specified will limit available spindle current and is not recommended.
Both the H222 and H226 use the same A16B-2202-0432 control board. Does this mean the two modules are interchangeable?
No. While they share the same control PCB, the power boards differ and motor parameters stored in NVRAM are matched to different motor ratings. Firmware versions also affect spindle function behavior. These modules should be treated as motor-matched assemblies, not interchangeable power stages.
What does the Type 1 interface designation mean for CNC system compatibility?
Type 1 supports standard spindle control functions including variable speed, spindle orientation, gear selection, basic synchronization, and speed/position feedback. It communicates via FANUC serial spindle link and is compatible with FANUC 0, 6, 10, 11, 15, 16i, 18i, 21i, and 30i/31i/32i CNC generations.
AL-09 (Power Semiconductor Overheat) keeps appearing. What should be checked first?
Check both the external 12mm fan (A90L-0001-0335/B) and internal 60mm cooling fan (A90L-0001-0422) for proper operation, ensuring they spin freely and air passages are unobstructed. Proactive fan replacement every 2-3 years of heavy operation is standard preventive maintenance.
Is the #H500 version of the H226 available new, or only as refurbished/repaired units?
As a mature product line, factory-new production is not reliably available. The supply market consists of refurbished units from FANUC-specialist repair centers, old-new-stock from distributors, and tested used units. Confirm exact suffix matching and test method verification before purchase.
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