ABB CHBX01L 2VAA008574R10001 Compact Bus Extension Terminal Block

The ABB CHBX01L 2VAA008574R10001, also cataloged as the CHBX01L Compact Bus Extension Terminal Block, operates as a dedicated hardware component for HN800 bus extension and power distribution within ABB Compact Products 800 DCS platforms.

Hardware Specifications

HN800 Bus Extension & System Integration Attributes

• Backplane Bus Communication & Extension Velocity: Integrated into the HN800 deterministic backplane bus environment, providing 90 mm bus interconnectivity to extend signal lines seamlessly between adjacent horizontal rows without signal degradation or timing jitter.
• Galvanic Isolation & Overvoltage Protection: Rated for Category 1 overvoltage compliance under IEC/EN 61010-1 standards, withstanding high-potential galvanic isolation test voltages up to 1500 V for 1 minute across power rail interfaces.
• Dual-Line Redundancy Execution: Built-in line redundancy architecture supports dual-channel signal paths, providing physical signal path separation and system fault tolerance across industrial I/O backplanes.
• Power Distribution Topology: Features a dedicated 4-point field terminal block (L+, L-, SA, SB) rated for 3.0 A @ 24 VDC continuous throughput, supporting field conductor wiring cross-sections from #18 AWG to #12 AWG.

Frequently Asked Questions

Q: Can the ABB CHBX01L module be hot-swapped during active backplane operation?

A: No. The CHBX01L does not support hot-swapping. System power and field power buses must be completely de-energized prior to inserting or removing the module to prevent electrical arcing and backplane communication interruption.

Q: What is the maximum continuous current rating for the field power terminal block on the CHBX01L?

A: The 4-point field power terminal block (L+, L-, SA, SB) is rated for a maximum continuous current of 3.0 A @ 24 VDC using field signal wire sizes ranging from #18 AWG to #12 AWG.

Q: How does the CHBX01L handle galvanic isolation across its bus and power interfaces?

A: The module is factory tested to withstand a dielectric isolation voltage of 1500 V for up to 1 minute, compliant with IEC/EN 61010-1 Overvoltage Category 1 standards.

Field Installation Guidelines

1. Mounting & Mechanical Alignment: Mount the CHBX01L vertically on standard DIN-rail in a horizontal row layout. Align the 90 mm HN800 bus connector with the adjoining backplane base to ensure flush physical engagement.
2. Power Off Verification: Verify that all 24 VDC field supply voltages and backplane system power sources are shut off before installation, as hot insertion is strictly prohibited.
3. Field Wiring Termination: Strip conductors to recommended length and terminate #18 AWG to #12 AWG solid or stranded copper wires to the 4-point terminal block (L+, L-, SA, SB). Torque terminal screws according to standard cabinet assembly specifications.
4. Grounding & Shielding Protocol: Connect all cable shields to designated cabinet earth ground bars via low-impedance grounding clamps. Keep signal leads isolated from high-voltage AC power lines to avoid electromagnetic interference.