1. Product Model

• Model No.: 0-51851-4 (also written as 0518514)

2. Brand

• Brand: Reliance Electric (Baldor / ABB Group)

3. Product Category

• Category: Industrial Drive Control Board

• Type: CRCA PC Control Regulator Board (Rev -4)

4. Alias

• Official Name: CRCA PC Control Regulator Board, Revision 4

• Other Names: Regulator Control Card, 4-Dial Drive Tuning PCB, Speed/Torque Calibration 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• Status: Obsolete / Discontinued; supplied as refurbished or surplus industrial spare parts

• Revision: -4 (improved noise immunity, tighter tolerance components vs. -1/-5/-6)

• NSN: 5998-01-217-6706 (logistics identifier)

6. Function & Positioning

• Core Function: Precision 4-loop drive parameter regulation; independent adjustment of Speed, Torque, Gain, Bias via front-panel dials. Provides stable analog control signals for drive regulation loops, with enhanced filtering and surge protection for harsh environments.

• Positioning: High-performance analog tuning and calibration board for Reliance heavy-duty DC/AC drives; critical for optimizing dynamic response and steady-state accuracy under variable loads.

7. Core Performance Parameters

• Control Dials: 4 × 10-turn rotary potentiometers (0–10 scale, ±0.1% resolution)

• Regulation Ranges:

  • Speed: 0–100% (0–10 VDC analog output)

  • Torque: 0–100% (0–10 VDC analog output)

  • Gain: 0–20 (proportional loop gain)

  • Bias: ±10% (offset adjustment)

• Accuracy: ±0.2% full scale (better than base 0-51851)

• Response Time: ≤ 50 ms

• Isolation: 500 VDC (control ↔ power circuits)

• Operating Temperature: 0°C ~ +55°C (extended range vs. base model)

• Storage Temperature: -40°C ~ +85°C

• Protection: EMI/RFI filtering, transient voltage suppression, short-circuit protection

8. General Matching Accessories

• Drive main control rack (Reliance Cardpack series)

• Analog signal cable harness (shielded, 16AWG)

• Rack mounting hardware (screws, brackets)

• Dial adjustment tool (small flathead screwdriver)

• Replacement faceplate (0-51851-4 specific)

• Backplane connector (compatible with Reliance drive racks)

9. Applicable Equipment & Industry

• Applicable Equipment:

  • Reliance MaxPak Plus DC Drives (all frames)

  • Reliance VS Series AC Drives (VS-500, VS-1000)

  • Reliance VS Spindle Drives

  • Reliance GV3000 AC Drives (legacy models)

  • Heavy-duty industrial variable speed drives (ABB/Baldor compatible)

• Applicable Fields:

  • CNC machine tools & machining centers

  • Metallurgical rolling mills & steel processing

  • Mining conveyors & crushers

  • Industrial automation production lines

  • Paper & printing presses

  • Textile spinning & weaving machinery

  • Plastics extrusion & injection molding