Model Definition

• 0-54400-7: Full part number (Speed Feedback Interface Board)

• Alternative IDs: 0544007, O-54400-7

• Status: Discontinued by manufacturer; no direct OEM replacement

• Cross-Reference: No fully compatible equivalent; requires exact part match

Technical Specifications

• Form Factor: Standard 3U PCB (approx. 248 × 171 mm)

• Weight: ~0.5 kg

• Logic Voltage: ±15 VDC, +5 VDC (from system power supply)

• Signal Inputs:

  • Encoder: 5 VDC differential (A/B/Z channels), up to 1 MHz

  • Tachometer: 0–10 VDC analog, bidirectional

• Resolution: 12-bit analog-to-digital conversion

• Protection: Overvoltage, ESD, and reverse-polarity protection

• Operating Temp: 0 °C to +55 °C

• Mounting: 3U rack slot, goldfinger edge connector (AutoMax/MaxPak backplane)

Interfaces & Communication

• Backplane: 3U edge connector (interfaced with drive CPU and power supply)

• Feedback Inputs: Screw terminals for encoder (A/B/Z) and tachometer signals

• Internal Links: Flat-cable connectors for inter-board signaling

• No Network Ports: Hardwired interface board; no serial/Ethernet communication

Key Features

1. High-Precision Speed Feedback: Converts encoder/tach signals to digital data for closed-loop control

2. Dual Input Support: Accepts both incremental encoder and analog tachometer inputs

3. Signal Conditioning: Filters, buffers, and isolates feedback signals to reduce noise

4. Diagnostic LEDs: Status indicators for power, signal, and fault conditions

5. 3U Rack Design: Directly interchangeable in AutoMax/MaxPak control racks

Application

• Drive Systems: AutoMax DC Drives, MaxPak Series DC Drives (50–2000 HP)

• Subassemblies: Control racks, feedback interface panels, motion control cabinets

• Industries: Steel, paper, mining, cranes, conveyors, machine tools

• Function: Critical for closed-loop speed/position control in high-precision DC drive applications

Compatibility

• Compatible Racks: AutoMax DCS Rack, MaxPak Drive Rack

• Voltage Compatibility: 230/460/575 VAC DC drives

• Power Range: 50–2000 HP (matches AutoMax/MaxPak drive ratings)

Critical Notes

• Function Distinction: Different from 0-54390 (power supply), 0-54392-2 (control board), and 0-54394 (driver card); this is a speed feedback interface board

• Replacement Challenge: No direct substitute; refurbished 0-54400-7 units are standard solution

• Availability: Limited stock; longer lead times; pricing varies by condition