1. Product Model

2. Brand

3. Product Category

4. Alias

• Official：FCCC – Field Control Board, Revision 7

• Other：Field excitation regulator board, motor field control card, field weakening speed control board, field regulator module

5. Basic Information

• Manufacturer：Reliance Electric, USA

• Structure：19” rack plug-in card（Cardpack chassis）

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

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

• Panel：Marked FCCC；terminals 181、182、F1、F2；calibration potentiometers；Rev 7 = final revision

6. Function & Positioning

• Core Function：Precise closed-loop control of DC motor field current（final Rev 7）

  • Stabilize excitation current & enable field weakening for high-speed constant-power operation

  • Enhanced ESD protection, noise immunity, and thermal design vs. Rev 2/3/4

  • Interlocks with armature drive for wide-range synchronous speed regulation

  • Triggers protection on loss-of-field, overcurrent, or overtemperature

• Positioning：Final upgraded field control core board for Reliance industrial DC drives

7. Core Performance Parameters

• Input：Control signals, ±15 VDC auxiliary power

• Output：Adjustable steady DC excitation current（typically 0–5 A）

• Control：Closed-loop current regulation with precision calibration pots

• Operating Temperature：0°C ~ +55°C

• Storage Temperature：-40°C ~ +85°C

• Protections：Loss-of-field, overcurrent, overheat, transient voltage suppression

• Revision Upgrade：Rev 7 = ultimate version，with full component upgrade & reliability optimization

8. General Matching Accessories

9. Applicable Equipment & Industry

• Equipment：Reliance MaxPak / MaxPak Plus, PRL, Cardpack series DC drives, VS spindle drives

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