1. Product Model

• Model No.: 0-51851 (also written as 051851)

2. Brand

• Brand: Reliance Electric (Baldor / ABB Group)

3. Product Category

• Category: Industrial Drive Control Board

• Type: PC Control Regulator Board (CRCA)

4. Alias

• Official Name: CRCA PC Control Regulator Board

• Other Names: Regulator Control Card, Drive Parameter Adjustment PCB, Four-Dial Control Board

5. Basic Information

• Manufacturer: Reliance Electric, USA

• Form Factor: 19-inch rack-mount plug-in PCB, metal faceplate with 4 rotary dials (0–10 scale)

• Weight: Approx 0.91 kg (2.0 lbs)

• Dimensions: 254 × 203 × 25 mm (L × W × H)

• Status: Obsolete / Discontinued; available as refurbished or surplus parts

• Revision: Base version (no suffix); variants: -5, -6

6. Function & Positioning

• Core Function: Precision drive parameter regulation; provides adjustable control of speed, torque, gain, and bias via four front-panel dials. Optimizes drive performance and stability under varying load conditions.

• Positioning: Critical analog control and tuning component for Reliance heavy-duty drives; enables manual calibration and fine-tuning of drive regulation loops.

7. Core Performance Parameters

• Control Dials: 4 × rotary potentiometers (0–10 scale, 10-turn)

• Regulation Range: Speed (0–100%), Torque (0–100%), Gain (0–20), Bias (±10%)

• Resolution: 0.1% per dial step

• Signal Interface: Analog voltage (0–10 VDC)

• Operating Temperature: 0°C ~ +50°C

• Storage Temperature: -40°C ~ +85°C

• Isolation: 500 VDC between control and power circuits

8. General Matching Accessories

• Drive main control rack

• Analog signal cable harness

• Rack mounting hardware

• Dial adjustment tool

• Replacement faceplate

9. Applicable Equipment & Industry

• Applicable Equipment:

  • Reliance MaxPak / MaxPak Plus Series DC Drives

  • Reliance VS Series AC Drives

  • Reliance VS Spindle Drives

  • Heavy-duty industrial variable speed drives

• Applicable Fields:

  • CNC machine tools

  • Metallurgical & steel processing

  • Mining & heavy machinery

  • Industrial automation lines

  • Paper & printing equipment

  • Textile machinery