1. General Information

• Part Number: 0-52854 (52854, 0-52854-1 / -2 revisions)

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

• Product Type: VCTC Transductor Board (Voltage-to-Current Transducer & Control PCB)

• Application: FlexPak / CardPak Series DC Drives (signal conversion & current loop control)

• Status: Obsolete / Discontinued; refurbished & surplus units available

• Mounting: Panel-mount, screw-clamp terminals, standard plug-in edge connector

2. Electrical Specifications

• Logic Supply: 24 VDC (drive internal control power)

• Signal I/O:

  • Input: Analog voltage signals (0–10 VDC reference/feedback)

  • Output: Isolated current loop signals (4–20 mA or 0–50 mA)

• Transductor Function: Precision voltage-to-current conversion for drive regulation loops

• Isolation: Opto-isolated inputs/outputs for noise immunity

• Protection: Overvoltage, overcurrent, short-circuit & surge protection

• On-board Components: Precision transductor, filter networks, regulation ICs, test points

3. Key Functions

1. VCTC Conversion: High-accuracy voltage-to-current signal translation for DC drive control loops

2. Current Loop Regulation: Stabilizes drive current feedback for speed/torque control

3. Signal Isolation: Isolates low-level control signals from high-power drive circuits

4. Fault Monitoring: Detects signal loss/abnormality & triggers drive interlocks

5. Calibration: Onboard trim potentiometers for gain/offset adjustment

4. Mechanical Characteristics

• Form Factor: Standard CardPak plug-in PCB (panel-mount design)

• Dimensions: Approx. 190 × 120 × 30 mm

• Connection: Rear gold-finger edge connector; front screw-clamp terminal strip

• Faceplate: Part number, Reliance logo, status LEDs (PWR/FAULT)

• Weight: ~0.27 kg

• Coating: Conformal coated (dust, moisture & corrosion resistance)

5. Environmental Ratings

• Operating Temp: 0°C to +55°C

• Storage Temp: -20°C to +70°C

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

• Vibration: 10–100 Hz, 0.15 mm amplitude (industrial standard)

6. Installation & Replacement

1. Power OFF: Disconnect all drive main & control power

2. Mount Card: Secure to panel with mounting screws; align edge connector

3. Wire Terminals: Connect control signals to front screw-clamp terminals

4. Seat Connector: Press edge connector firmly into backplane slot

5. Power ON: Calibrate trim pots; verify signal conversion & fault logic

7. Troubleshooting

• No Output Signal: Check 24 VDC supply, terminal wiring, or onboard transductor

• Unstable Current Loop: Adjust trim pots; inspect input voltage signal quality

• Fault LED ON: Check for short circuits, signal loss, or component failure

• No Power to Card: Verify backplane 24 VDC and connector seating

8. Compatibility

• Drives: FlexPak 3000, FlexPak Plus, CardPak DC Drive Chassis

• Interchangeability: Pin-compatible with 0-52854-1 / -2 revisions; cross-compatible with similar 0-528xx series control cards

• Wiring: Standard screw-clamp terminals & edge connector; no program modifications required