Description

ABB PVD164A2059 3BHE014340R2059

I. Basic Information

Part Code: 3BHE014340R2059 | Model: PVD164A2059 (Master Communication Board for AC800PEC / UNITROL)

Product Positioning: Original ABB-manufactured product from Switzerland, a dedicated AC800PEC excitation processor board and redundant PROFIBUS‑DP fieldbus communication module. It serves as a matched COB master control component for UNITROL5000/6000 generator excitation systems and a critical spare part installed inside excitation regulator cubicles of thermal power plants, hydropower stations and captive power plants, supporting 24/7 non-stop redundant operation. All variants of the PVD164A series feature compatible rack slot dimensions for direct drop-in replacement, designed as an alternative to legacy RLM01 (3BDZ000398R1) fieldbus modules.

Brand: ABB Power Grids | Origin: Switzerland
Category: Excitation System CPU Master & Redundant DP Bus Conversion Board (AC800PEC Platform)
Compatibility: Full-range UNITROL5000/6000 excitation cubicles and AC800PEC controllers; configured as a complete cabinet assembly together with UNS2881 measurement boards and UNS0881 pulse firing boards.
Mounting: Plug-in installation into standard European-style rack slots inside excitation control cubicles; Overall dimension: 248×115×25mm; Net weight: approx. 0.26kg; Full PCB coated with triple-proof insulating paint and fitted with metal enclosure; Ingress Protection: IP30 (for installation inside sealed control cabinets).
Onboard Configuration: Backplane gold-finger edge connector, dual galvanically isolated PROFIBUS-DP terminal blocks, three-color LED indicators for status/fault/communication, and relay terminals for fault alarm output.

II. Technical Specifications

(1) Electrical Parameters

Power Supply: Wide-range DC input 9~36V (nominal 24VDC±10% standard cabinet control power); maximum rated power consumption ≤22W; built-in hardware protection against reverse polarity, surge and short-circuit faults.
Fieldbus Interface: Dual galvanically isolated redundant PROFIBUS-DP bus with auto-adaptive baud rate ranging from 2.4kbps to 12Mbps; supports bidirectional protocol conversion between single-bus and dual redundant-bus modes to enable data exchange between master controller, local I/O boards and pulse firing boards.
Analog & Digital Acquisition: Onboard acquisition circuits designed for generator terminal AC100V voltage, CT secondary AC5A current and 4~20mA excitation feedback signals; passive dry-contact relay output for fault alarm.
Processor: Dedicated AC800PEC DSP chip with onboard FLASH memory; excitation parameters and bus configuration data are permanently retained after power loss; online firmware upgrade available via serial port.

(2) Environmental Parameters

Operating Temperature: -20℃～+65℃ for continuous long-term cabinet operation; Storage Temperature: -40℃～+85℃.
Humidity: 5%~95% RH non-condensing; compliant with IEC61000 EMC industrial immunity standards to withstand harsh site conditions including excitation harmonics, dust and condensed moisture inside cubicles.

III. Key Features

1. Closed-loop AVR Master Calculation for Excitation Control

Embedded standard PID excitation regulation algorithm supporting multi-mode control: constant terminal voltage, constant reactive power and constant power factor. Voltage regulation accuracy ≤±0.5% and step response ≤100ms; the core arithmetic component of the entire excitation system.

2. Redundant DP Bus Link Switchover

Seamless automatic switchover to standby channel upon single DP bus failure; short-circuit on one bus channel will not interrupt full-cabinet communication, eliminating single-point downtime risks of old single-bus excitation systems and ideal for redundant retrofit upgrades.

3. Full-circuit Hardware Self-diagnosis

Automatic pre-check of CPU, bus circuits and acquisition channels during power-on; corresponding LED alarm for broken communication, abnormal sampling or disconnection of downstream pulse boards; fault dry-contact output and fault code upload to DCS HMI screen.

4. Cross-version Wiring-free Drop-in Replacement

Backward compatible with early-generation PVD164A and legacy RLM01 communication boards; no modification to rack base or field wiring required during excitation system revamp, enabling direct plug-and-play replacement.

5. Multi-protocol Interconnection

Natively supports PROFIBUS-DP + Modbus-RTU dual protocols for direct connection to plant DCS, background monitoring systems and smart transmitters; remote data transmission realized without additional external gateways.

IV. Working Principle

Power-on Self-test: After 24VDC energization, the board runs self-inspection for onboard power supply, DSP processor, DP transceiver circuits and sampling channels, and completes backplane communication handshake with UNS2881 measurement boards and UNS0881 pulse firing boards.
Signal Acquisition: Real-time collection of analog signals including generator terminal voltage, stator current and rotor excitation current.
Calculation & Command Generation: Executes closed-loop AVR calculation against setpoints, generates phase-shift control commands and transmits them to UNS0881 pulse boards via DP bus.
Bus Data Exchange: Cyclically uploads field measurement data to unit DCS over dual DP buses and receives remote setpoint parameters from upper system; automatic redundant switching triggered once one bus channel fails.
Fault Handling: Fault location is flagged immediately upon defective sampling/bus/downstream boards; communication of faulty channel is isolated while remaining circuits keep normal operation, accompanied by simultaneous relay alarm contact activation.

V. Application Scenarios

(1) Excitation for Turbo-generators in Thermal Power Plants (Primary Application)

Standard master communication board for UNITROL5000/6000 cubicles on 30MW~660MW units; commonly stocked wearable spare for excitation systems.

(2) Excitation for Medium & Large Hydraulic Generating Units

Original OEM core component of excitation regulators for mixed-flow and axial-flow hydro-generators.

(3) Captive Power Plants in Steel, Coking & Refining Industries

Retrofit replacement spare for turbo-generator excitation systems of on-site self-owned power stations.

(4) Combined-cycle Gas Turbine & Biomass Power Plants

Matching component for full-series UNITROL static excitation systems.

Version Differentiation

PVD164A2059｜3BHE014340R2059 (Current R2059 Version): Dual redundant DP design with enhanced EMC performance, universally applicable for new unit construction and existing plant renovation projects.
Early standard PVD164A with Rxxxx suffix: Single-channel DP bus without redundant function, still in service on legacy aging excitation units.