1. General Information

• Part Number: 0-48673 (also written as 48673, 048673)

• Manufacturer: Reliance Electric (Rockwell Automation)

• Product Type: 104/105 FlexPak Series Regulator Board / Motherboard

• Function: Control & regulation card for Reliance FlexPak 104 / 105 series DC drives

• Status: Obsolete / legacy; available as new surplus, refurbished, or used

• Application: Industrial DC motor control, process lines, conveyors, machine tools

2. Specifications

2.1 Electrical

• Drive Compatibility: FlexPak 104 (230/460 VAC), FlexPak 105 (575 VAC)

• Control Signals: ±10 VDC reference, 4–20 mA analog input, enable/disable, fault reset

• Feedback: Tachometer (analog) or encoder (optional)

• Power Requirement: 115/230 VAC (drive internal supply)

• Protection Circuits: Overvoltage, overcurrent, short circuit, overtemperature

2.2 Mechanical

• Form Factor: Standard Reliance 104/105 card slot

• Dimensions: Standard industrial PCB (matches original 0-48673)

• Mounting: Plug-in into FlexPak 104/105 chassis backplane

• Connectors: Edge connector (signal + power), screw terminals for field wiring

3. Features

• Speed Regulation: Closed-loop speed control with tach/encoder feedback

• Current Limiting: Adjustable armature current limit

• Accel/Decel Control: Adjustable ramp-up / ramp-down times

• Fault Monitoring: Overcurrent, overspeed, field loss, thermal trip

• Isolation: Opto-isolated I/O for noise immunity

• Compatibility: Direct replacement for original 0-48673 in FlexPak 104/105 drives

4. Installation

1. Power OFF: Disconnect all AC power to the drive.

2. Access Chassis: Remove drive cover to expose card slots.

3. Insert Board: Align 0-48673 with slot; push firmly until seated.

4. Connect Wiring: Terminate field signals (reference, feedback, enable) per drive diagram.

5. Restore Power: Apply power and verify no fault LEDs.

6. Tune Parameters: Adjust current limit, accel/decel, and speed loop gain as needed.

5. Troubleshooting

• No Speed Response: Check ±10 V reference, enable signal, and board fuses.

• Overcurrent Fault: Verify motor insulation, armature shorts, or current limit setting.

• Overspeed Trip: Check tach wiring, feedback scaling, or loose motor coupling.

• Noisy Operation: Check grounding, shielded cables, or opto-isolation wiring.

6. Availability & Warranty

• New Original: Discontinued by Reliance Electric.

• Supplied As: Refurbished (tested), used (working pull), or new surplus.

• Warranty: Typically 12 months (refurbished); 30–90 days (used)

7. Replacement Notes

• Direct Replacement: 0-48673 is the only direct OEM part for FlexPak 104/105 regulator slot.

• Cross Reference: No modern drop-in equivalent; use original or refurbished board.