1. Product Model

• Model No.: 0-51847-4 (also written as 0518474)

2. Brand

• Brand: Reliance Electric (Baldor / ABB Group)

3. Product Category

• Category: Industrial Drive Voltage Detection Board

• Type: Drive System Monitoring & Protection PCB

4. Alias

• Official Name: VLDE Voltage Detector Board (VLDE = Voltage Detector, Enhanced)

• Other Names: Voltage Sense Card, Overvoltage Protection Board, DC Bus Monitoring PCB, Bias Adjustment Board

5. Basic Information

• Manufacturer: Reliance Electric, USA

• Form Factor: 19-inch rack-mount plug-in PCB, metal faceplate, trimming potentiometer, LED status indicators

• Weight: Approx 0.45 kg (0.99 lbs)

• Dimensions: 254 × 178 × 12.7 mm (L × W × H)

• Status: Obsolete / Discontinued; supplied as refurbished or surplus industrial spare parts

• NSN: 5998-01-217-6706 (assigned for military/industrial logistics)

• Revision: -4 (updated component layout, improved surge immunity vs. -1)

6. Function & Positioning

• Core Function: Precision DC bus voltage monitoring for industrial drives; provides overvoltage/undervoltage detection, adjustable threshold, fault relay output, and LED indication. Protects power devices from voltage spikes and abnormal conditions.

• Positioning: Enhanced voltage monitoring and safety protection component for Reliance heavy-duty drives; ensures stable operation and reliable fault diagnosis under harsh industrial conditions.

7. Core Performance Parameters

• Input Voltage: Drive DC bus (240–600 VDC nominal, up to 800 VDC peak)

• Detection Range: 0–800 VDC (field-adjustable via trim pot)

• Accuracy: ±0.5% of full scale (improved over -1 version)

• Response Time: ≤ 80 ms

• Outputs: Fault relay contact (NO/NC), analog monitor signal, power/fault LEDs

• Operating Temperature: 0°C ~ +50°C

• Storage Temperature: -40°C ~ +85°C

• Protection Features: Overvoltage, undervoltage, short-circuit, transient surge suppression

8. General Matching Accessories

• Drive main control rack

• DC bus power wiring harness

• Signal connection cables

• Rack mounting hardware

• Precision adjustment tool

9. Applicable Equipment & Industry

• Applicable Equipment:

  • Reliance 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 production lines

  • Paper & printing equipment

  • Textile machinery