1. General Information

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

• Part Number: 0‑51446 (also 051446)

• Product Type: Amplifier Circuit Card / Signal Amplifier Board

• Application: Reliance S3 / ImPak Plus / VS series DC variable speed drives

• Function: Amplifies low‑level control signals; provides gain adjustment and signal buffering for drive regulation loop; enhances drive response and stability

• Status: Obsolete (OEM discontinued); available as used / refurbished

• Warranty: 6–12 months (refurbished units)

2. Electrical Specifications

• Control Supply: +15 VDC / −15 VDC (from power supply board 0‑51444)

• Input Signal: Low‑level analog control signals (±10 VDC max)

• Output Signal: Amplified analog signal (±15 VDC max, 10 mA drive capability)

• Gain Range: Adjustable via multi‑turn trim pot (1–20×)

• Bandwidth: DC to 5 kHz

• Onboard Protection:

  • Overvoltage protection

  • Overcurrent limiting

  • ESD protection

• Isolation: Signal isolation between input and output (1000 VAC)

3. Physical & Mechanical

• Dimensions (L × W × H): 220 × 35 × 25 mm (8.7 × 1.4 × 1.0 in)

• Weight: Approx. 0.2 kg (0.44 lbs)

• Construction: Industrial PCB with conformal coating (dust/moisture resistance)

• Key Components:

  • Multi‑turn trim potentiometer (gain adjust)

  • Operational amplifiers

  • Precision resistors & capacitors

  • Protection diodes

• Connection: 26‑pin edge connector (compatible with drive backplane)

4. Environmental Ratings

• Operating Temperature: 0°C to +50°C (32°F to 122°F)

• Storage Temperature: −20°C to +70°C (−4°F to 158°F)

• Humidity: 5%–95% RH, non‑condensing

• Vibration: Industrial grade (cabinet mounting)

5. Compatibility

• Matched Main Control Board: 0‑51381 series

• Matched Power Supply Board: 0‑51444

• Matched Gate/Trigger Boards: 0‑51419, 0‑51422, 0‑51423, 0‑51445‑A

• Drive Models: S3, ImPak Plus, VS series DC drives

6. Installation & Adjustment Notes

1. Power Safety: Disconnect all AC/DC power before installation or service.

2. Mounting: Insert board into designated drive slot; ensure edge connector is fully seated.

3. Voltage Check: Verify ±15 VDC control supply is within ±5% tolerance.

4. Gain Adjustment: Apply input signal; adjust trim pot for desired output gain.

5. Signal Check: Verify amplified output signal is stable and noise‑free.

6. Test: After installation, test drive acceleration/deceleration for smooth response.