Model Definition

• 0-54374: Base part number (PC Relay Board / Auxiliary Relay Card)

• Status: Discontinued by manufacturer; no direct OEM replacement

• Cross-Reference: No fully compatible equivalent; replacement requires exact part match or system reconfiguration

Technical Specifications

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

• Weight: ~0.5 kg

• Relay Ratings: 24 VDC control; 120/240 VAC, 5 A resistive

• Logic Voltage: 5 VDC internal; 24 VDC external control

• Components: Electromechanical relays, opto-isolators, status LEDs, surge suppression

• Operating Temp: 0 °C to +55 °C

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

Interfaces & Communication

• Backplane: 3U goldfinger edge connector (fits AutoMax/MaxPak rack)

• External I/O: Screw terminals for relay contact outputs and 24 VDC control

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

Key Features

1. Auxiliary Relay Outputs: Isolated contacts for fault, run, and ready status signaling

2. Control Interlocking: Enables interlock logic with external PLCs or safety circuits

3. Opto-Isolation: Electrical isolation between drive logic and external loads

4. LED Status Indicators: On-board LEDs for power, relay actuation, and fault status

5. Compact 3U Design: Seamless integration into existing AutoMax/MaxPak drive cabinets

Application

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

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

• Function: Auxiliary control and status signaling in DC drive systems

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: Separate from 0-54339 (memory board), 0-54341 (rectifier suppressor), 0-54346 (static rheostat board), and 0-54363 (control input board)

• Replacement Challenge: No direct substitute; refurbished units are the most common solution

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