1 PC New Fanuc A20B-0009-0320 PCB Board In Good Condition

A20B-0009-0320 | FANUC 6047 Series DC Servo Drive PCB — A06B-6047 / Velocity Control / M-Series Yellow-Cap / Jumper Configuration

A06B-6047 — The M-Series DC Servo Era

The A06B-6047 series represents FANUC's DC servo drive generation — the era before the AC brushless Alpha series. These drives powered FANUC CNC machine tools on brush-type DC servo motors.

The drives are known by two field names:

"M-Series": Identifying the generation of FANUC DC servo motors served by these drives.

"Yellow-cap drives": Named for the yellow-colored encoder caps on the associated DC servo motors — replacing the earlier "black-cap" generation. This visual identifier is well-known among technicians servicing legacy FANUC machinery.

The A20B-0009-0320 is the velocity control board inside these single-axis A06B-6047 drives. GE Fanuc Spares confirms the complete compatibility list: A06B-6047-H002, H003, H040, H041, and H104.

Key Specifications

Service Availability

The A20B-0009-0320 has comprehensive after-market service support despite its age:

• GE Fanuc Spares: Same-day exchange, in-house repair, testing
• FanucWorld: New, refurbished, and repair options
• Radwell: 2-year warranty repair
• FanucWorld #SPL variant: Spindle application (Core Exchange required)

The long service life of M-Series machines in production makes this board a regularly demanded spare part.

Application Scenarios

A06B-6047-H002 velocity control fault: A CNC lathe's X-axis velocity control alarm traces to the A20B-0009-0320. The installed revision is confirmed (/10D). A matching revision replacement is fitted with jumper settings transferred from the original board. Velocity control is restored.

Legacy CNC machinery refurbishment: A production facility with long-running M-Series CNC machines proactively replaces A20B-0009-0320 boards as part of a planned maintenance cycle.

FAQ

Q1: What is the main difference between the 6047 DC servo drive and the later Alpha (A06B-6079) AC servo drive?

The A06B-6047 drives DC (brush) servo motors using armature current regulation — the motor has physical brushes and a commutator. The A06B-6079 Alpha series drives AC (brushless) servo motors using three-phase PWM current control. The DC to AC transition brought higher reliability (no brush wear), higher efficiency, and better high-speed performance. The A20B-0009-0320 is DC-era hardware; the A20B-2001-0930 class serves the AC Alpha era.

Q2: Why are there so many revision variants of A20B-0009-0320?

The 6047 drive series had a long production life — spanning many years of FANUC CNC production. Revisions accumulated over this period as component availability changed, circuit improvements were made, and compatibility issues were resolved. With 8+ confirmed revision variants (/03F through /16E), it is essential to match the revision before ordering a replacement.

Q3: What motors are driven by the A06B-6047 single-axis drives?

The A06B-6047 drives M-Series (Yellow-cap) DC servo motors. These are FANUC DC servo motors from the corresponding era — typically identified by their yellow encoder cap covers. The motor's rated voltage, rated speed, and encoder type must match the drive's configuration to achieve correct velocity control performance.

Q4: Can A20B-0009-0320 be used in a spindle application?

The standard A20B-0009-0320 is confirmed for servo axis applications. The spindle variant (#SPL) requires Core Exchange and may have different gain or parameter scaling. Confirm the application type before selecting between the standard and #SPL variants.