1. General Information

• Part Number: 518491, 0-51849-1, GDCB

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

• Series: MaxPak Plus / HR2000 / CardPAK DC Drive Systems

• Type: GDCB – Gate Driver Control Board (power semiconductor gate drive & protection)

• Function: Isolated gate drive for SCR/IGBT power devices, pulse generation, overcurrent/short-circuit protection, firing angle control for DC drives

• Status: Obsolete; refurbished / NOS available

• Mounting: 3U Eurocard for CardPAK rack or direct chassis mount

• Cross-reference: 0-51849-3 (GDCD, enhanced protection), 0-51849 (GDCA, base model)

2. Electrical Specifications

• Backplane Supply: ±15 VDC (nominal), 24 VDC auxiliary

• Power Consumption: ≤ 12 W

• Gate Drive Outputs:

  • SCR Gate: 4–15 VDC pulse, 1–5 A peak current

  • IGBT Gate: ±15 VDC, 2 A peak (source/sink)

• Input Signals:

  • Firing Angle: 0–10 VDC (0–180°)

  • Current Feedback: 0–5 VDC (shunt input)

  • Enable/Inhibit: 24 VDC logic

• Protection Features:

  • Overcurrent: Adjustable threshold (100–150% rated)

  • Short-Circuit: Fast response (< 10 μs)

  • Gate Fault: Open/short detection

• Isolation Voltage: 2500 VAC (control-to-power)

• Pulse Frequency: 50/60 Hz (line synchronous)

• Adjustments: Onboard trimpots for Gain, Offset, Current Limit, Pulse Width

• Indicators: Power LED, Fault LED, Gate Drive OK LED, Current Limit LED

• I/O Interface: Edge connector (backplane); front 16-pin screw terminal header

3. Mechanical Specifications

• Form Factor: 3U Eurocard

• Dimensions (W×H×D): 100 mm × 160 mm × 40 mm (with heatsink)

• Weight: ~0.61 kg (~1.35 lb)

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

• Connector: Gold‑finger edge (backplane); front 16‑pin screw terminal header

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, 0.15 mm amplitude (operational)

• Certifications: UL, CSA, CE

5. Key Features

• Isolated high‑current gate drives for SCR/IGBT power stages

• Precision line‑synchronous pulse generation for DC drive rectifiers

• Integrated overcurrent/short‑circuit protection with fast shutdown

• Adjustable firing angle (0–180°) via 0–10 VDC control signal

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

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

6. Compatibility

• Racks: CardPAK 6‑slot, 12‑slot, 18‑slot; MaxPak Plus chassis

• Drives: Reliance MaxPak Plus, HR2000, FlexPak, MinPak DC drive systems

• Interchangeability: 0-51849-1 / 518491 fully interchangeable