1. General Information

• Part Number: 490051, 0-49005-1, O490051

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

• Series: CardPAK Engineered DC Drives (FlexPak / MinPak / MaxPak compatible)

• Type: Linear Voltage Time Unit (LVTU) – closed‑loop voltage regulator & timing control board

• Function: Precision linear voltage output, adjustable time delay, closed‑loop feedback regulation for DC drives

• Status: Obsolete; refurbished / used units available

• Mounting: CardPAK rack, standard 3U Eurocard slot

• Related Manuals: CardPAK Instruction Manuals, Reliance DC Drive System Guides

2. Electrical Specifications

• Backplane Supply: ±15 VDC (nominal)

• Power Consumption: ≤ 5 W

• Output Voltage Range: 0–10 VDC linear adjustable (or ±10 VDC configurable)

• Regulation Mode: Closed‑loop voltage regulation with feedback

• Time Delay Range: 0.1 second to 100 seconds (potentiometer adjustable)

• Linearity: ±0.1% of full scale

• Temperature Coefficient: ±50 ppm/°C

• Adjustments: Onboard potentiometers for Gain, Offset, Time Constant

• Indicators: Power LED, Fault LED, Active LED

• I/O Interface: Edge connector (backplane); front header for field wiring

3. Mechanical Specifications

• Form Factor: 3U Eurocard

• Dimensions (W × H × D): 100 mm × 160 mm × 30 mm

• Weight: Approximately 0.45 kg

• Construction: Conformal coated PCB, industrial grade, metal front panel

• Connector: Edge finger (backplane); front header for external I/O

4. Environmental Ratings

• Operating Temperature: 0 °C to +55 °C

• Storage Temperature: −20 °C to +70 °C

• Humidity: 10%–90% RH, non‑condensing

• Vibration: 10–100 Hz, 0.1 mm amplitude (operational)

• Certifications: UL, CSA, CE

5. Key Features

• Precision linear voltage regulation: 0–10 VDC adjustable output

• Integrated time‑delay functions: 0.1–100 seconds for sequencing and coordination

• Closed‑loop feedback: fast response to load changes, tight voltage stability

• Compact 3U Eurocard design: fits standard CardPAK racks, hot‑swap capable

• Onboard trim potentiometers: easy field calibration (Gain, Offset, Time)

• Industrial robustness: conformal coating, wide temperature range, vibration resistance

6. Compatibility

• Racks: CardPAK 6‑slot, 12‑slot, 18‑slot

• Drives: Reliance Electric FlexPak, MinPak, MaxPak DC drive systems

• Interchangeability: 0-49005-1 / 490051 fully interchangeable

• Cross‑reference: 0-49005-5 (similar model, different timing range)