1. Product Model

2. Brand

3. Product Category

4. Alias

• Official：Armature Regulator Drive Board

• Other：Arm regulator board, armature control card, DC drive armature regulator, motor armature current control board

5. Basic Information

• Manufacturer：Reliance Electric, USA

• Structure：19” rack plug-in card（special long-edge backplane connector）

• Status：Obsolete / Discontinued，only refurbished/legacy stock

• Dimensions：approx. 4” × 5”（102 mm × 127 mm）

• Panel：Four calibration potentiometers, two relays, edge connector on long side

• NSN：5998-00-171-6681

6. Function & Positioning

• Core Function：Precise closed-loop control of DC motor armature current

  • Regulates armature voltage/current for smooth, wide-range speed control

  • Works with field control board (e.g., 0-51893-7) for full DC drive operation

  • Provides current limiting, overcurrent protection, and speed feedback processing

  • Optimizes torque response and stability for heavy-load applications

• Positioning：Primary armature control core board for Reliance industrial DC drives

7. Core Performance Parameters

• Input：±15 VDC auxiliary power, speed reference, current feedback

• Output：Regulated armature current signal, drive command to power stage

• Control：Closed-loop current regulation with 4 trim pots (gain, offset, limit, response)

• Operating Temperature：0°C ~ +55°C

• Storage Temperature：-40°C ~ +85°C

• Protections：Overcurrent, short-circuit, thermal overload, voltage surge suppression

8. General Matching Accessories

9. Applicable Equipment & Industry

• Equipment：Reliance MaxPak, PRL, Cardpack series DC drives, heavy-duty spindle drives

• Industries：Metallurgical rolling, paper machinery, mining conveyors, heavy machine tools, industrial constant-torque speed regulation systems