Model Explanation

• 0-56918: Base part number (SP500 PC Base Board)

• -101: Assembly revision 101 (Rev 03 is common, industrial standard layout)

Technical Parameters

• Manufacturer: Reliance Electric (Rockwell Automation)

• Series: SP500 AC Drives (0.5–240 Hz output)

• Input Voltage: 120/240VAC single-phase, 208–575VAC three-phase

• Control Power: 24VDC ±10%

• Power Components: On-board MOVs (Metal Oxide Varistors) for transient suppression; capacitors, resistors, diodes, and jumpers

• Connectors: 6 dedicated connectors for power, I/O, and communication interfaces

• Operating Temperature: 0°C to +55°C

• Dimensions: 150 × 210 × 30 mm

• Weight: 1.5 kg

• Revision: Commonly Rev 03

Interface & Communication Configuration

• Power Interfaces

  • AC Input: Terminal block for line power

  • DC Bus: Connection to IGBT power module

  • 24VDC Output: Auxiliary power for control circuits

• Signal Interfaces

  • Analog I/O: 0–10V / 4–20mA (speed reference/feedback)

  • Digital I/O: 24VDC (start/stop, fault reset, interlocks)

  • Communication: Ribbon cable to regulator board (0-56951-301)

• Protection: MOVs suppress voltage spikes; on-board fuses for overcurrent protection

Core Functions

1. Power Distribution: Routes AC input to DC bus and auxiliary circuits.

2. Signal Conditioning: Filters and isolates analog/digital signals.

3. Base Control Logic: Manages drive initialization, fault detection, and safety interlocks.

4. Interface Hub: Connects power module, regulator board, and external I/O.

5. Transient Protection: MOVs absorb voltage surges to protect components.

Application Scenarios

• Compatible Drives: Reliance Electric SP500 series (all HP ratings, NEMA 1/4/12 enclosures)

• Industries: Manufacturing, material handling, HVAC, water treatment, food & beverage

• Applications: Conveyors, pumps, fans, mixers, extruders, general-purpose variable-speed drives

Operation & Maintenance Instructions

Installation

1. Mount horizontally in the lower section of the SP500 drive cabinet.

2. Secure with four screws (1.0–1.2 N·m torque).

3. Connect DC bus to IGBT module first, then AC input and control cables.

4. Torque terminal screws to 1.2 N·m; verify no loose connections.

Maintenance

• Quarterly: Inspect terminals, solder joints, and MOVs; clean dust with low-pressure dry air.

• Annual: Test MOVs for proper voltage clamping; check capacitor capacitance.

• Replacement: Use only original 0-56918-101; power off and lock out/tag out the drive before service.

Troubleshooting

• No power: Check AC input, fuses, and 24VDC auxiliary supply.

• Voltage spikes: Inspect MOVs for damage; replace if discolored or cracked.

• I/O errors: Verify ribbon cable connections to the regulator board.

Precautions

• Static Protection: Wear anti-static wristband when handling the board.

• High-Voltage Caution: DC bus may hold residual charge; discharge before servicing.

• Environment: Avoid moisture, corrosive gases, and heavy vibration.