1. Product Model

2. Brand

3. Product Category

4. Alias

• Official：Speed Feedback Driver Board

• Common：Tachometer Driver Board, Speed Signal Interface Card, Feedback Amplifier Board, Drive Control Card

5. Basic Information

• Manufacturer：Reliance Electric, USA

• Structure：19” rack-mount plug-in card, edge connector

• Status：Obsolete / Discontinued（legacy spare part only）

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

• Features：Trimpots for calibration, signal amplification & filtering circuits

• NSN：5998-00-171-6681（similar series）

6. Function & Positioning

• Core Function：Conditions and amplifies tachometer/generator speed signals for DC drive closed-loop control；converts raw low-level speed pulses into standard analog signals；provides gain/offset adjustment and noise filtering；ensures stable speed feedback for precise regulation。

• Positioning：Key speed feedback interface board for Reliance industrial DC drives；works with armature regulator（0-51901-A）and field control board（0-51893-7）to form a complete high-performance DC speed control system。

7. Core Performance Parameters

• Input：Tachometer/generator AC pulse signal（low level）

• Output：Isolated, buffered analog speed feedback（0–10 VDC）

• Adjustments：Gain, offset, filter response（multi-turn trimpots）

• Power：±15 VDC auxiliary supply

• Operating Temp：0°C ~ +55°C

• Storage Temp：-40°C ~ +85°C

• Protections：Overvoltage, surge suppression, short-circuit protection

8. General Matching Accessories

• Armature regulator board：0-51901-A

• Field control board：0-51893-7

• Main logic board, gate trigger board, shielded signal cables, tachometer wiring, rack hardware

9. Applicable Equipment & Industry

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

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