General Information

• Manufacturer: Reliance Electric (now Rockwell Automation)

• Part Number: 0-51814-3 (0518143)

• Product Type: Voltage Converter Board (VFCB)

• Application: Legacy DC drives (MaxPak, MaxPak Plus, FlexPak 3000, GV3000)

• Function: High-voltage isolation, step-down, and signal conditioning for voltage feedback (DC bus, armature, field)

• Status: Obsolete / discontinued; available as used, refurbished, or NOS

• Warranty: Typically 12 months for refurbished units

Key Differences: 0-51814-1 vs 0-51814-3 vs 0-51814-4

• 0-51814-1: Early revision, original VFCB design

• 0-51814-3: Mid-life revision; component layout & shielding improved, same form/fit/function as -1

• 0-51814-4: Late revision; minor PCB trace & protection circuit updates

  All three are pin-compatible and interchangeable in the same drive slots.

Electrical Specifications

• Power: +5VDC, ±15VDC from backplane

• Input: Up to 600VDC / 480VAC

• Output: Isolated 0–10VDC (standard feedback)

• Isolation: 1000VDC (input-to-output)

• Accuracy: ±0.5% full scale

• Adjustment: Onboard potentiometers (gain/offset calibration)

• Protection: TVS, MOV, current limiting, ESD protection

Physical & Mechanical

• Form Factor: Standard rack plug-in card

• Dimensions: ~220 × 150 mm

• Connections: Gold-finger backplane connector; 2-position screw terminal strip (with cover)

• Construction: Conformal-coated PCB, industrial-grade components

  

Common Applications

• DC bus voltage monitoring → 0–10V feedback to regulator boards

• Armature/field voltage sampling → speed/voltage loop feedback

• High-voltage isolation for control circuits and analog meters

• Works with: 0-51811-1/3 (test boards), 0-51805-5 (encoder/pulse board), 0-51772-3R (main control board)