Power Supply A06B-6087-H137 A06B6087H137 AO6B-6O87-H137

FANUC A06B-6087-H137 | Alpha Power Supply Module PSM-37 — 43 kW, 200–230V AC Input

Part Number: A06B-6087-H137

Cross Reference: A06B6087H137

Manufacturer: FANUC Ltd. (Japan)

Product Type: Alpha Power Supply Module — PSM-37

Input Voltage: 200–230V AC, 50/60 Hz

The Drive System's Power Foundation

The A06B-6087-H137 is the PSM-37 (Power Supply Module, 37/43 kW class) in FANUC's Alpha drive system. In FANUC's modular drive architecture, the PSM is the first module in the drive cabinet — it rectifies the incoming AC supply into the DC bus voltage that powers all connected servo and spindle amplifier modules. Without a functioning PSM, none of the machine's drives can operate.

At 43 kW output and 150A input current, the PSM-37 serves medium-to-large CNC machine tools — typically machines with high-power spindles and multiple servo axes. A PSM-37 can power an equivalently rated spindle amplifier module alongside a dual-channel or combination of servo amplifier modules, depending on the combined rated output power of those amplifiers.

The module contains three IGBT transistor modules that perform the active rectification and regeneration. FANUC's Alpha PSM design supports regenerative braking: when servo or spindle motors decelerate, the PSM feeds the regenerated energy back to the AC supply, reducing energy consumption compared to resistive braking systems.

Drive System Context

All three module types connect on a shared DC bus bar. The PSM supplies the bus; the SPM and SVM draw from it. A failed PSM removes power from all connected modules simultaneously — the entire drive system goes offline.

Key Specifications

FAQ

Q1: The FANUC drive system shows AL-01 (PSM overheat) or AL-02 (PSM undervoltage). Is the A06B-6087-H137 failing?

AL-01 on the PSM typically means the heatsink temperature has exceeded the alarm threshold. Check both fans (internal and external) are running and the heatsink fins are clear of dust and swarf. Blocked cooling is the most common cause of PSM overheat. AL-02 (undervoltage) indicates the DC bus output has dropped below the threshold — check the AC input voltage at the PSM terminals before assuming the module has failed.

Q2: Can the A06B-6087-H137 supply a spindle amplifier and multiple servo amplifiers simultaneously?

Yes — provided the combined rated output power of the connected amplifiers does not exceed the PSM's 43 kW output rating. Add up the kW ratings of all connected SPM and SVM modules. If the total exceeds 43 kW, a larger PSM (such as the PSM-45 or PSM-55) is required to prevent overloading.

Q3: The PSM-37 module is physically large and heavy. What installation precautions apply?

The A06B-6087-H137 is 150 mm wide with a substantial external heatsink. It must be mounted vertically to allow proper convection airflow across the heatsink. Minimum clearance above and below the module must be maintained as specified in FANUC's installation manual. The module must be secured to the mounting rail with all fasteners — its weight makes it susceptible to vibration-induced loosening if only partially fastened.

Q4: The internal IGBT modules in the PSM-37 have failed. Are they replaceable?

Yes. FANUC CNC repair specialists who work with Alpha drive systems can replace the IGBT transistor modules inside the A06B-6087-H137. The IGBTs are standard industrial devices accessible after opening the PSM housing. This is significantly more economical than replacing the entire PSM-37 assembly, particularly for a module at this power level. Request a full functional test at rated load after IGBT replacement before returning the module to service.

Q5: Is the A06B-6087-H137 interchangeable with the A06B-6087-H130 (PSM-30)?

No. The PSM-37 (H137) and PSM-30 (H130) have different output power ratings — 43 kW vs 30 kW. They are not interchangeable. Fitting a lower-rated PSM-30 in an application designed for the PSM-37 risks overloading the PSM-30 when all amplifiers are operating at rated load. Always match the PSM rating to the combined load requirement of the connected amplifiers.