FANUC Servo Amplifier A06B-6110-H015 A06B-6110-H015 A06B6110H015

The A06B-6110-H015 — known within FANUC's drive documentation as the PSM-15i — is the 200V-class, 17.5 kW member of the FANUC Alpha i series power supply module lineup. It occupies a central and non-negotiable role in any αi series drive cabinet: without it, no servo axis moves, no spindle turns. Finding a verified, tested unit is the fastest path back to production when this module fails.

FANUC's Alpha i series drive architecture separates the AC-to-DC conversion function from the motor control function. Servo amplifier modules (SVMs) and spindle amplifier modules (SPMs) do not convert AC power directly — they receive a high-voltage DC bus that the PSM establishes and maintains. The A06B-6110-H015 takes three-phase 200-240V AC from the machine's input breaker, converts it to a regulated 283-339V DC bus, and distributes that bus rail to every amplifier module connected downstream in the drive chain.

Everything that moves on the machine — all feed axes and the spindle — draws its motor power through the single DC link the PSM-15i provides. A failed PSM shuts down the entire motion system at once.

One of the defining features of the αi PS series — and the PSM-15i specifically — is its power regeneration capability. When a servo axis or spindle motor decelerates, it acts as a generator. Older drive systems dealt with this regenerated energy by burning it off through resistor banks, creating heat that had to be managed and adding a wear component to the cabinet.

The A06B-6110-H015 routes regenerated energy back to the AC supply line instead. The thermal load on the cabinet is reduced, the resistor bank is eliminated as a failure point, and on machines with frequent high-load deceleration cycles — spindle braking on machining centers, for example — the energy savings across a production run are meaningful. This is a standard feature on all αi PS series modules, not an add-on.

The A06B-6110-H015 runs continuous self-diagnostics and surfaces faults through a single-digit LED display on the module front face. When the ALM LED lights red, the following alarm code identifies the specific fault condition:

For PSM-5.5i through PSM-15i class modules, AL-1 specifically indicates an abnormal condition in the internal power module (IPM). Probable causes include a control supply voltage drop within the IPM itself, or an input supply voltage imbalance across the three phases. Both should be verified before condemning the module.

AL-4 and AL-5 are the most frequently encountered alarms in aged PSMs and commonly trace to electrolytic capacitor degradation in the DC bus section — a predictable end-of-life failure mode in first-generation 6110 series modules with significant operating hours.

The 17.5 kW output capacity and 200V class positioning place the A06B-6110-H015 in drive cabinets on small-to-medium FANUC CNC machine tools — typically those with 2-4 feed axes and a single spindle where the combined servo and spindle motor demand falls within 17.5 kW. This includes:

Compatible CNC generations include the FANUC 0i (all series), 16i, 18i, 21i, 30i, 31i, and 32i — covering essentially the full span of FANUC CNC platforms that used the αi series drive architecture from its introduction through current production.

The A06B-6110-H015 belongs to FANUC's first-generation 6110 series αi PS modules. Its direct successor is the A06B-6140-H015, a second-generation unit with an updated PCB and wiring board revision. Both generations occupy the same PSM-15i form factor and share compatible mechanical mounting and electrical interfaces, making the A06B-6140-H015 a viable field replacement when the original 6110 unit is no longer obtainable.

For maintenance scenarios where the machine documentation specifies the 6110 series or where an identical unit-for-unit replacement is required, the A06B-6110-H015 remains the correct part number to source.

The PSM-15i is a single-point-of-failure component in any machine where it's installed. There is no degraded mode — a failed PSM means zero machine output until the module is restored. This makes it one of the highest-priority items on any FANUC αi series spare parts list, particularly in production environments where machine downtime has a direct cost.

The main aging failure mechanisms in first-generation 6110 series PSMs are predictable: electrolytic capacitor degradation in the DC bus section (typically manifesting as AL-4, AL-5), and cooling fan end-of-life (AL-2, AL-A). On modules with high accumulated operating hours, both items are worth addressing proactively before they cause an unplanned stoppage.