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KB Electronics KBRG-212D

Product Name
KBRG-212D regenerative four-quadrant SCR DC drive.
Product Overview
Full-wave regenerative DC motor drive for permanent-magnet and shunt-wound DC motors. It provides forward and reverse speed control with regeneration during deceleration, making it suitable for overhauling loads and frequent reversing.
Category:
Description
Technical Specifications
  • Part number: 8819
  • Input voltage: 115 VAC or 208/230 VAC single-phase, 50/60 Hz
  • Output voltage: 0 to ±90 VDC at 115 VAC input; 0 to ±180 VDC at 208/230 VAC input
  • Output current: up to 7.5 A DC
  • Horsepower: 3/4 HP at 115 VAC; 1.5 HP at 208/230 VAC
  • Field supply: 100 or 50 VDC at 115 VAC input; 200 or 100 VDC at 230 VAC input
  • Speed range: 50:1
  • Regulation: ±1 percent with armature feedback; ±1 percent with tachometer feedback
  • Line regulation: ±0.5 percent
  • Acceleration/deceleration: 0.1 to 15 seconds forward and reverse
  • Current ranges: 1.7, 2.5, 5.0 and 7.5 A DC by jumper
  • Control modes: speed or torque
  • Enclosure: IP20 chassis
  • Operating temperature: 0 to 40 degrees Celsius
Functional Features
Four-quadrant regeneration, forward/reverse bridging, armature or tachometer feedback, adjustable current limit, IR compensation, acceleration/deceleration timing, Auto Inhibit, MOV protection, armature/line/control fusing and diagnostic LEDs.
Application Scenarios
Reversing conveyors, hoists, winders, dynamometers, machine-tool spindles, positioning tables and regenerative load-test stands.
Performance Parameters
Regenerative braking returns energy to the AC line during deceleration. Current-limit circuit restricts armature current during start, stall and reversal. LED indicators show power and overload status.
Material Composition
Steel or aluminum chassis, silicon-controlled rectifiers, industrial PCB, copper bus bars, aluminum heatsink, plastic terminal insulators, galvanized mounting hardware.
Structural Characteristics
Chassis drive with armature terminal block, field terminal block, AC line terminals, signal terminal strip, jumper selection area, trimpots, SCR bridge assembly and status LEDs.
Working Principle
Four SCR bridges control armature voltage and direction. In motoring quadrants the bridge supplies controlled DC power. In braking quadrants the bridge operates as a regenerative rectifier, returning armature energy to the AC supply. Feedback from armature voltage or tachometer compares with the speed command to adjust firing angles and current limit.
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