1. General Information

• Part Number: 0-49020-4 (0490204)

• Manufacturer: Reliance Electric (Rockwell Automation / Baldor‑Reliance)

• Type: High‑precision analog speed/voltage reference card (CardPak plug‑in)

• Series: 0-49020‑xx (reference modules for FlexPak/MinPak DC drives)

• Application: Closed‑loop DC drive systems; ultra‑stable 0–10 VDC setpoint for critical speed control

• Status: Obsolete / Discontinued (legacy; used/refurbished only)

• Key Difference from 0-49020-2: Higher accuracy, lower drift, enhanced stability

2. Electrical Specifications

• Control Power: +24 VDC ±10% (CardPak bus)

• Output Signal: 0–10 VDC precision analog (speed reference)

• Accuracy: ±0.05% full scale (vs ±0.1% for 0-49020-2)

• Temperature Drift: ±25 ppm/°C (vs ±50 ppm/°C for 0-49020-2)

• Linearity: ±0.02%

• Adjustments: Multi‑turn pots for Zero, Span, Fine Trim, Stability

• Isolation: Galvanic isolation (input‑to‑output, noise rejection)

• Protection: Overvoltage, reverse polarity, ESD, transient suppression

3. Mechanical & Physical

• Form Factor: Standard CardPak plug‑in (edge connector)

• Dimensions: 4 in × 6 in × 2 in (102 mm × 152 mm × 51 mm)

• Weight: ~1.6 lbs (0.73 kg)

• Connector: Gold‑plated edge contacts (CardPak standard)

• PCB: Conformal coated (moisture/dust/corrosion resistance)

• Enclosure: Industrial black metal, EMI/RFI shielding

4. Environmental Ratings

• Operating Temp: 0 °C to +55 °C

• Storage Temp: −40 °C to +70 °C

• Humidity: 5%–95% RH, non‑condensing

• Vibration: 1 g (10–100 Hz)

• Shock: 10 g, 11 ms

5. Key Features

1. Ultra‑precision reference: ±0.05% accuracy for tight speed regulation.

2. Low drift design: ±25 ppm/°C for long‑term stability in industrial environments.

3. Enhanced calibration: Multi‑turn pots for fine zero/span trimming.

4. High noise immunity: Isolated output and heavy shielding.

5. Drop‑in compatible: Fits all CardPak racks; direct swap for 0-49020-2.

6. Compatibility

• Racks: All Reliance CardPak series racks

• Drives: FlexPak DC, MinPak DC, legacy Reliance DC drives

• Related Modules:

  • 0-49017‑xx: Summing cards

  • 0-49013‑4: Speed feedback card

  • 0-49009‑3: Regulator/driver card

7. 0-49020 Series Comparison

• 0-49020-2: Standard precision (±0.1% accuracy, ±50 ppm/°C drift)

• 0-49020-4: High precision (±0.05% accuracy, ±25 ppm/°C drift)

• 0-49020-1: Low‑range / limited span

• 0-49020-3: High‑temperature rated