Basic Information

• Manufacturer: Reliance Electric (Rockwell Automation)

• Part Number: 0-49042 (common variant: 0-49042-1 / 0490421)

• Type: Power Amplifier Card (DC Drive Control)

• Series: CardPak (legacy DC drive system)

• Application: Speed & current loop amplification, signal conditioning for DC armature control

• Status: Obsolete / Discontinued (spare parts only)

Electrical Specifications

• Control Input: ±10 VDC analog signal (speed/current command)

• Output: High-current drive signal to SCR firing cards (e.g., 0-49040-2)

• Control Power: +5 VDC, ±15 VDC (CardPak bus)

• Gain: Factory-calibrated, adjustable via on-board potentiometer

• Bandwidth: DC to 10 kHz (small-signal)

• Protection: Overvoltage, overcurrent, short-circuit, thermal shutdown

• Isolation: Galvanic isolation between input/output and logic ground

Mechanical & Environmental

• Mounting: Standard CardPak slot-mount (slide-in, front-panel screw secure)

• Dimensions (L×W×H): 305 × 254 × 203 mm (12 × 10 × 8 in)

• Weight: Approx. 1.8 kg (4.0 lbs)

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

• Storage Temp: -20°C to 60°C (-4°F to 140°F)

• Humidity: 5%–95% non-condensing

• Vibration: Compliant with industrial cabinet standards

Key Features

• High Gain & Stability: Precision amplification for closed-loop speed/current control

• Direct Compatibility: Matches all CardPak DC drive chassis and modules

• Front Adjustments: Potentiometers for gain, offset, and loop calibration

• Status LEDs: Power ON, Fault (overcurrent/thermal), and Signal activity

• Compact Design: Form-factor interchangeable with other CardPak cards

• Reliable Operation: Industrial-grade components for long-term stability

Installation & Adjustment

Installation

1. De-energize the entire drive system.

2. Insert 0-49042 into the designated CardPak slot.

3. Tighten front-panel mounting screws.

4. Verify edge connectors are fully seated; check control power wiring.

Adjustment (No-Load)

1. Power on drive with motor disconnected.

2. Set input signal to 0 VDC; adjust Offset potentiometer for 0 VDC output.

3. Apply full-scale input (±10 VDC); adjust Gain potentiometer for rated output.

4. Reconnect motor; calibrate loop response per drive manual.

5. Test light-load operation for smooth speed and no oscillation.

Operation & Faults

• Normal: Power LED ON; output follows input command; stable loop operation.

• Overcurrent: Fault LED ON; output clamped (reset after clearing fault).

• Thermal Trip: Fault LED ON; module overheated (cool before restart).

• Signal Loss: No output; check input wiring and control power.

Compatibility & Maintenance

• Compatible Modules: 0-49040-2 (rectifier), 0-49029-2 (protection), 0-49004 (DC amplifier), other CardPak I/O modules.

• Maintenance: Keep card clean; inspect socket contacts; avoid high-temperature operation; check potentiometer tightness periodically.