During motor regeneration, the chopper provides the switching path that connects the engineered brake resistor to the drive DC circuit so regenerated electrical energy can be converted to heat instead of allowing the DC-link voltage to rise without control. Its usable resistor and braking limits are not one universal NBRA-657C rating: ABB pairs it with SAFUR125F500 at 4 ohms, 3600 kJ per 400-second pulse interval, and 9 kW continuous dissipation for documented 180 A drive types, or SAFUR200F500 at 2.7 ohms, 5400 kJ, and 13.5 kW for documented 195 A types. The corresponding catalog maximum braking powers are 135 kW and 165 kW respectively. NBRA-657C is used with the exact ACS510-01/ACS550-01 frame-R6 drive type, a correctly selected SAFUR braking resistor, DC-link and resistor cabling, thermal/fire protection, and the drive's own control and protection settings in high-inertia, rapid-deceleration, or cyclic-braking machinery where the calculated braking duty stays within ABB limits.
Apter Power NBRA-657C 59006410 Manuals and Guides
Important Notice: The first link is the product-parameters PDF prepared only from the cited manufacturer information; the second link is the Apter Power product manual. Confirm the physical nameplate, current manufacturer documents, and host-system requirements before installation or replacement.