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ACBU-A1

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The ACBU-A1 is an active crowbar unit designed to protect the rotor-side converter of the ACS800-67LC by ensuring stable operation during grid voltage dips and preventing damage due to excessive DC link voltage or rotor current.
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Technical specifications for ACBU-A1

  • Manufacturer:
    ABB
  • Part Number:
    ACBU-A1
  • Product Family:
    ABB Drives
  • Protection Function:
    DC link overvoltage, rotor overcurrent
  • Compatible Converter:
    ACS800-67LC
  • Components:
    6-pulse diode bridge, power semiconductors, brake resistor
  • Trigger Conditions:
    High DC link voltage or high rotor current
  • Bridge Voltage Signal:
    06.11 CB BRIDGE VOLTAGE ≥ DC link × 1.10
  • IGBT Voltage Signal:
    06.12 CB IGBT VOLTAGE ≥ DC link × 1.10
  • Connection:
    3-phase rotor-side converter terminals
  • Operating Temperature:
    20°C to +60°C
  • Storage Temperature:
    -40°C to +85°C
  • Protection Class:
    IP65
  • Weight:
    14 kg
  • Estimated shipping dimensions:
    15x10x15cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Sweden
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.
Description
The ABB ACBU-A1 Active Crowbar Unit is a critical component in the ACS800-67LC drive system, designed to provide robust protection against overvoltage and overcurrent conditions on the rotor-side converter. Equipped with a 6-pulse diode bridge, power semiconductors, and a brake resistor, this unit ensures operational safety during grid voltage dips and sudden faults. The crowbar unit is firmware-controlled, providing independent protection by triggering when either the DC link voltage or rotor current exceeds preset limits.

This protective device helps maintain drive stability and prevents catastrophic failure by ensuring the system can operate under fault conditions. Monitoring and control are facilitated via key signals including bridge voltage, IGBT voltage, and IGBT temperature, which are available for diagnostics and system health checks. It operates effectively within a wide temperature range and is compatible with the ACS800-67LC, making it an essential piece of the modular protection system.
Alternative Names
AC8U-A1 ACBU-AI ACBUA1 AC8UA1 ACBUAI
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Is the ACBU-A1 currently in stock?
Availability can vary. Please contact us for real-time stock information.
Is there any discount available for the ACBU-A1?
Discount options may be available for bulk orders or long-term partnerships. Please inquire directly for more details.
Can the ACBU-A1 be used with other ABB drives?
The ACBU-A1 is specifically designed for use with the ACS800-67LC. Compatibility with other drives may require verification.

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