1. Product Model

• Model No.: 0-51847 (variants: 0-51847-1, 0-51847-4)

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: VLDB Voltage Detector Board

• Other Names: Voltage Sense Card, Drive Overvoltage Protection Board, Bias Adjustment PC Board

5. Basic Information

• Manufacturer: Reliance Electric, USA

• Structure: 19-inch rack-mount plug-in PCB with metal faceplate, bias potentiometer & LED indicators

• Weight: Approx 0.45 kg (0.99 lbs)

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

• Status: Obsolete / Discontinued; available as refurbished or surplus parts

• NSN (0-51847-4): 5998-01-217-6706

6. Function & Positioning

• Core Function: Monitors drive DC bus voltage; provides overvoltage/undervoltage detection, bias adjustment, and fault signaling for drive protection circuits. Ensures safe operating voltage range for power devices.

• Positioning: Critical voltage monitoring & protection component for Reliance industrial drives; prevents damage from voltage anomalies and enables reliable fault diagnosis.

7. Core Performance Parameters

• Input Voltage: Drive DC bus (typically 240–600 VDC)

• Detection Range: 0–800 VDC (adjustable via bias potentiometer)

• Accuracy: ±1.0% of full scale

• Response Time: ≤ 100 ms

• Output Signals: Fault relay contact, analog voltage signal, LED status indicators

• Operating Temperature: 0°C ~ +50°C

• Storage Temperature: -40°C ~ +85°C

• Protection: Overvoltage, undervoltage, short-circuit protection

8. General Matching Accessories

• Drive main control rack

• DC bus wiring harness

• Signal connection cables

• Rack mounting hardware

• Bias adjustment tool

9. Applicable Equipment & Industry

• Applicable Equipment:

  • Reliance MaxPak / MaxPak Plus Series DC Drives

  • Reliance VS Series AC 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