ABB BGAD-13C 3AUA0000112492 Drive I/O Module – ACS800 Series

ABB BGAD-13C 3AUA0000112492 — Relay Digital Output Module for ACS800 Variable Frequency Drives

The BGAD-13C (ABB catalog reference 3AUA0000112492) is a dedicated relay-type digital output option board engineered for the ACS800 series variable frequency drive platform. Within a closed-loop drive control architecture, this module occupies a defined option slot on the ACS800 control unit and extends the drive’s native I/O capability by providing galvanically isolated relay contacts that interface directly with external PLC inputs, safety relay chains, and SCADA discrete input cards. Its role is not supplementary — in multi-drive installations where the base I/O count of the ACS800 control board is exhausted by process interlocks, the BGAD-13C becomes a structural component of the control loop, carrying fault relay, run-status, and speed-threshold signals to supervisory systems without routing through external I/O racks or marshalling panels.

The module communicates with the ACS800 control unit via the drive’s internal option board bus, a synchronous parallel interface that transfers I/O state data within the drive’s main task cycle. This architecture eliminates the latency penalty associated with fieldbus-coupled remote I/O and ensures that relay output state changes track drive internal status variables — such as fault word bits, speed actual thresholds, and torque limit flags — with deterministic timing aligned to the drive’s control cycle period. For process applications where relay output response time directly affects interlock chain reaction time, this synchronous coupling is a measurable engineering advantage over externally wired relay modules driven by PLC analog or digital outputs.

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Technical Parameters

Hardware Logical Analysis

The BGAD-13C’s relay output architecture is built around electromechanical contacts rather than solid-state switching elements. This design choice carries specific engineering implications for industrial drive applications. Relay contacts present a near-zero on-state voltage drop regardless of load current within the rated range, which eliminates the leakage current path that characterizes transistor or triac output stages. In safety interlock circuits where a PLC safety input card monitors the relay contact for a true open-circuit condition during a de-energized state, this zero-leakage characteristic is essential for correct fault detection logic.

The galvanic isolation barrier between the relay coil — driven by the ACS800 option board bus — and the relay contact circuit provides a defined creepage and clearance distance between the drive’s low-voltage control domain and the field wiring domain. This isolation architecture suppresses common-mode transients originating from inductive loads switched on the same field wiring bus, preventing transient energy from coupling back into the ACS800 control board’s signal ground plane. In installations where the relay contacts switch motor auxiliary contactors or solenoid valves sharing a common 24 VDC supply with the drive control circuit, this isolation is the primary EMC protection mechanism for the drive’s microprocessor subsystem.

The option board bus interface on the ACS800 platform uses a synchronous parallel protocol with a fixed data transfer window within each drive control task cycle. The BGAD-13C’s output register is written by the ACS800 firmware at the end of each control cycle, meaning relay state changes are bounded by the drive’s task cycle period — typically 1–2 ms for the fast task on ACS800 hardware. This deterministic update rate is a structural property of the option board architecture and cannot be replicated by an external relay module driven by a PLC digital output, which introduces additional scan cycle latency and communication stack jitter on top of the drive’s own processing delay.

The PCB layout of ABB option boards in the ACS800 family follows ABB’s internal EMC design standard, which specifies controlled impedance traces for the bus interface, ground plane segmentation between the digital logic area and the relay contact area, and transient voltage suppressor (TVS) devices on all bus interface lines. These design measures ensure the module meets IEC 61800-3 Category C2 conducted and radiated emission limits when installed in a standard ACS800 drive enclosure without additional external filtering.

System Integration Benefits

• Eliminates external relay modules: By mounting directly in the ACS800 option slot, the BGAD-13C removes the need for DIN-rail relay modules, associated terminal blocks, and inter-panel wiring between the drive and an external relay bank — reducing panel component count and potential wiring fault points.
• Deterministic relay update timing: Output state is written synchronously within the ACS800 control task cycle (1–2 ms), providing bounded relay response latency that is independent of PLC scan cycle variation or fieldbus communication jitter.
• Zero-leakage contact output: Electromechanical relay contacts present true open-circuit conditions when de-energized, satisfying the input circuit requirements of safety relay modules and safety PLC input cards that detect leakage current as a fault condition.
• Native firmware parameter mapping: The ACS800 firmware recognizes the BGAD-13C via the option board identification register and exposes relay output assignment parameters in the drive’s parameter group structure, allowing relay outputs to be mapped to any drive status bit, fault word bit, or speed/torque threshold comparator output without external logic programming.
• Reduced panel wiring complexity: Signal routing between the drive’s internal status variables and the relay contacts occurs entirely within the drive enclosure via the option board bus, eliminating the analog or digital output wiring that would otherwise be required to drive an external relay coil from a PLC output card.
• Diagnostic transparency: Relay output state is readable as a parameter value within the ACS800 parameter set and via any connected fieldbus (PROFIBUS, DeviceNet, Modbus) as part of the drive’s I/O data object, enabling SCADA systems to verify relay state without a separate discrete input wired back from the relay contact.
• Compatibility across ACS800 frame sizes: The BGAD-13C option board connector and mechanical form factor are standardized across the ACS800 control unit variants, allowing the same module to be used in ACS800-01, ACS800-04, ACS800-07, and ACS800-11 configurations without hardware modification.
• Reduced commissioning time: ABB DriveWindow and the CDP control panel automatically detect the BGAD-13C upon power-up via the option board identification protocol, pre-populating the relevant parameter groups and eliminating manual module configuration steps during drive commissioning.

Quality Assurance & Global Logistics

Every BGAD-13C 3AUA0000112492 unit dispatched from our Xiamen, China facility is sourced as genuine ABB original hardware. Prior to shipment, each unit undergoes a structured inspection protocol: visual examination of the PCB surface, connector pin condition, relay contact area, and housing integrity; label verification cross-referencing the ABB part number, catalog number, and date code against ABB documentation records; and ESD-safe packaging in anti-static bags with foam cushioning to prevent mechanical and electrostatic damage during international transit.

Logistics from Xiamen cover all major international trade lanes. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for each shipment. DHL Express, FedEx International Priority, and UPS Worldwide Express services are available for time-critical orders, with transit times of 3–5 business days to Europe, North America, Southeast Asia, and the Middle East. For bulk orders, sea freight consolidation via Xiamen Port is available with full export customs clearance support. All shipments are covered by cargo insurance, and tracking information is provided at the time of dispatch.

A 12-month warranty from the date of dispatch covers manufacturing defects and functional failures under normal operating conditions as defined by ABB’s ACS800 installation and commissioning manual. Warranty claims are processed with a target response time of 48 hours, and replacement units are dispatched from Xiamen stock upon claim verification.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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