ABB ACS800 Application Manual
Also see for ACS 800 Series: User manualHardware manualHardware manualHardware manualInstallation guide
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Design18Internal brake chopper• Only one internal brake chopper is allowed to be active.• If an internal chopper is used, it must be in the biggest converter.• The maximum braking power of the brake chopper or the inverter must not beexceeded.• A contactor must be used in the resistor circuit for protection against brakechopper faults and against the overtemperature of the resistor.External brake chopper• An external brake chopper can be used but not at the same time with an internalbrake chopper.• The external chopper must be installed close, < 5 m, to the biggest brakingconverter.• The external chopper can be selected according to the braking power demand.For more information, see the appropriate drive Hardware Manual.• A contactor must be used for protection against brake chopper faults.Contactors, DC bus and brake circuitIf converters with different charging circuits are connected directly to the mainsupply, the DC links must be connected together via contactors. See Table 1.With an external or an internal brake chopper a contactor must be used forprotection against brake chopper faults.• Contactors must be capable of cutting off the DC current. The maximumoperational voltage over the contactor is the DC voltage during the braking, i.e.1.21 · 1.35 · U1.• DC current rating for the DC contactor can be calculated by using equation 4.Pcont.max is the drive power rating of the biggest converter and U1 is the supplyvoltage of the converter.IDCPDCUDC-----------=PDC Pcont.max≈ (equation 4)UDC 1.35 U1⋅= |
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