power supply A06B-6120-H011 A06B-6120-H011 A06B-6120-H011

FANUC A06B-6120-H011 | Alpha i PSM-11HVi Power Supply Module — 11 kW / 400V AC / 90mm / External Heatsink

HV — What Distinguishes This Module

The A06B-6120-H011 is the PSM-11HVi — the 11 kW power supply module from FANUC's Alpha i HV (High Voltage) series. The HV designation identifies the machine's supply voltage class: this module accepts 400V AC three-phase input and produces the regulated DC bus that feeds the HV-rated servo and spindle amplifier modules in the same cabinet.

This is not interchangeable with the standard 200V Alpha PSM series (A06B-6077-H111, PSM-11). Both produce 11 kW and share the 90mm housing width, but the A06B-6077 operates from 200–230V AC input while the A06B-6120 is designed for 400V AC. The machine's incoming supply voltage determines which is correct — fitting the wrong voltage-class PSM creates a fundamental mismatch that cannot be corrected by parameters.

At 11 kW, the PSM-11HVi supplies the DC bus for the 400V-rated Alpha i HV drive system: a combination of HV spindle amplifier modules and HV servo amplifier modules connected to the shared DC bus. The selection of the correct PSM capacity depends on the combined continuous demand of all connected HV drive modules in the cabinet.

Key Specifications

90mm Housing — Cooling and Physical Fit

The PSM-11HVi's 90mm wide housing carries an external heatsink at the rear, an internal fan circulating air across the control electronics, and an external fan assisting heatsink cooling. Both fans are wear items — the internal fan (serviced as a separate spare) should be replaced at scheduled intervals to maintain cooling performance. Fan bearing wear produces audible noise before the fan fails completely; plan fan replacement during a scheduled maintenance window rather than waiting for a cooling alarm.

The external heatsink passes through the cabinet rear panel. Cabinet installation requires the full depth of the module — approximately 307mm — behind the front mounting surface, with adequate clearance for heatsink airflow. Blocking the heatsink cooling path produces thermal overload alarms at load.

FAQ

Q1: What is the difference between the A06B-6120-H011 (PSM-11HVi) and the A06B-6077-H111 (PSM-11)?

Both are 11 kW power supply modules at 90mm wide, but they serve different input voltage classes. A06B-6077-H111 accepts 200–230V AC three-phase input; A06B-6120-H011 accepts 400V AC three-phase. The drive modules they power are also different — the A06B-6120 supplies HV-rated Alpha i drive modules designed for 400V input, not the 200V series. Confirm the machine's supply voltage and the connected drive modules before ordering.

Q2: Can the PSM-11HVi boards be repaired individually?

The control card and wiring board are not available separately — board-level failures route to exchange or to a specialist with component-level board repair capability. The 100A transistor module and the cooling fans are available as individual spare parts and can be replaced during service.

Q3: The PSM-11HVi shows a bus overvoltage alarm under normal load. What should be checked?

Bus overvoltage under normal load without heavy regenerative braking points to a fault in the active rectifier stage — an IGBT or gate drive circuit that is no longer regulating correctly. Do not reset and resume operation. An uncontrolled DC bus voltage rise can damage connected drive modules. The PSM requires service or exchange before returning the machine to production.

Q4: Does replacing the A06B-6120-H011 require CNC parameter changes?

No. The PSM stores no CNC parameters. After physical replacement, restore power and verify correct DC bus voltage at the connected HV drive modules before enabling axes. Confirm all connection cables and fibre links to the drive chain are correctly seated before powering up.

Q5: How should a used A06B-6120-H011 be evaluated before installation?

Check both fans for smooth rotation and correct speed at power-up. Inspect the transistor module for visible thermal stress or burn marks. A static bench power-up confirms the bus voltage appears at no load — but dynamic load testing on a matched HV alpha drive system with motor loads is the only validation that confirms the transistor's switching performance under actual conditions. Source from suppliers who offer load testing and a warranty period from installation date.