0-51820-1
Description
General Information
Manufacturer: Reliance Electric (Rockwell Automation)
Part Number: 0-51820-1 (also 0518201)
Product Type: Pulse Driver Board (PDB)
Application: Legacy DC drives — MaxPak, MaxPak Plus, FlexPak 3000, GV3000
Function: Amplify and condition encoder/tachometer pulse signals; drive long cables; boost pulse level/drive capability for high‑speed counting boards (e.g., 0-51818 series)
Status: Obsolete / discontinued; available as used, refurbished, NOS
Compatibility: Works with 0-51818-1/2 (BCCB), 0-51814 series (VFCB)
Electrical Specifications
Power: +5VDC (logic), ±15VDC (analog) from drive backplane
Input: 5–24VDC pulse, single‑channel or quadrature (encoder/tach)
Output: High‑level pulse (24VDC nominal), current‑sourced, capable of driving 100m+ cables
Channel Count: 2 independent channels (A/B quadrature)
Max Pulse Rate: 100 kHz (same as BCCB)
Isolation: 2500Vrms (field I/O to logic)
Protection: Surge, overcurrent, short‑circuit on outputs
Termination: Onboard DIP switches for 120Ω line termination
Physical & Mechanical
Form Factor: Standard rack‑mount plug‑in card
Dimensions: ~220 mm × 150 mm × 20 mm
Weight: ~1.1 kg
Connections: Gold‑finger backplane connector; screw terminals for field I/O
Construction: Industrial PCB with conformal coating (dust/moisture resistance)
Environmental
Operating Temp: 0°C to +60°C
Storage Temp: -20°C to +70°C
Humidity: 5%–95% RH, non‑condensing
Key Applications
Extend encoder pulse signals over long distances (no signal degradation)
Boost weak tachometer/encoder pulses for reliable counting by BCCB
Isolate field sensors from drive logic for noise immunity
Pair with 0-51818-1/2 for speed/position feedback in GV3000/FlexPak 3000 drives
Differences from Related Boards
0-51820-1: Pulse driver (amplifies/conditions pulses)
0-51818-1/2: Binary counter/conversion (counts pulses, outputs speed/position)
0-51814 series: Voltage‑to‑frequency (V/F) or frequency‑to‑voltage (F/V) conversion
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