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SEW-EURODRIVE FBG31C-08
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SEW-EURODRIVE FBG31C-08

  • Product Name:​ SEW-EURODRIVE FBG31C-08 Braking (Chopper) Resistor for Frequency Inverter Regenerative Braking
  • Product Introduction:​ External dynamic braking resistor from SEW-EURODRIVE’s FBG series, intended for connection to the DC-link brake chopper terminal of SEW MOVIDRIVE® B (MDX61B) or MOVITRAC® LTE-B inverters. Dissipates regenerative energy from decelerating high-inertia or overhauling loads that would otherwise cause DC-bus overvoltage.
Category:
Description
  • Technical Specifications (Typical for FBG31C class):
    • Resistance Value (R):​ Approx. 31–80 Ω (exact value depends on inverter size; FBG31C-08 commonly ~ 47–80 Ω — verify from nameplate)
    • Rated Power (Continuous):​ Typically 250 W–750 W continuous dissipation (air-cooled, mounted in free convection space)
    • Peak Power (Intermittent):​ 3–10× rated power for short braking intervals (10 s ON / 90 s OFF duty cycle typical)
    • Maximum Chopper Voltage:​ Matches inverter DC-bus chopper threshold (typ. 760–820 VDC for 400 V class inverters)
    • Connection:​ 2 × screw terminals for +DB / -DC link (pulsed DC)
    • Enclosure:​ Metal grid housing with ceramic/metal-oxide wirewound resistor element, finned for convection cooling
    • Surface Temp. (Loaded):​ Can reach 200–250 °C during braking — CAUTION: Burn hazard
    • Mounting:​ Control cabinet roof or side wall with adequate clearance (min. 100 mm from combustibles); secured by M6 screws
    • Ambient Temp.:​ -25 °C to +70 °C (derate above 40 °C)
    • Standards:​ IEC 60204-1, UL recognized components (where applicable)
  • Structure & Material:​ Wirewound resistance alloy on ceramic tube, housed in perforated steel/aluminum casing, high-temp silicone insulation leads.
  • Working Principle:​ When regenerative braking raises the inverter DC-bus above the chopper threshold, the internal brake transistor closes and dumps excess energy into the external resistor as heat. The resistor must have low enough ohmic value to sink sufficient current but high enough to stay within transistor rating.
  • Installation & Notes:​ Disconnect inverter power and wait > 10 min for DC-bus discharge before wiring. Use appropriately sized cable (min. 1.5 mm² Cu) and route separately from low-voltage signal wires. Never operate without resistor connected when braking function is enabled — may damage inverter. Allow cool-down time between heavy braking cycles. Verify resistance matches inverter minimum allowed RB value per manual.
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