Product Core Brief
- Model: SDCS-COM-81, Full OEM part number: 3ADT314900R1002
- Brand: ABB Hitachi Energy
- Series: ABB DCS800 series high-power DC variable speed drive optional communication subboard
- Core Function: High-speed optical DDCS communication gateway board plugged into the SDCS-CON-4 main control unit of DCS800 DC converters. It realizes two core transmission tasks:
- Optical DDCS fiber communication between drive main control board and power stage components for real-time current, voltage and temperature signal exchange;
- External fieldbus protocol conversion (PROFIBUS-DP, Modbus RTU, RS232/RS485) to connect DCS800 drives to AC800M / 800xA DCS, PLC and HMI systems.The exclusive optical fiber design fully isolates high-voltage EMI interference from DC main circuits to avoid communication distortion and random drive trips. The 3ADT314900R1002 variant supports 10 Mbaud DDCS high-speed deterministic bus for multi-drive synchronous coordinated control in rolling mills, paper machines and wind turbines.
- Product Type: Plug-in optical DDCS & multi-protocol fieldbus communication PCB
- Key Specs: 10 Mbit/s DDCS optical fiber bus interface; multi-channel serial communication terminals (RS232 / RS485); compatible with PROFIBUS-DP, Modbus RTU; 24 VDC internal logic power supplied by SDCS-CON-4; built-in communication diagnostic LED indicators; ISA G3 anti-corrosion conformal coating; plug-in slot installation inside DCS800 control unit
- Note: The entire DC drive platform including is fully end-of-production. Only limited factory-sealed original boards and fully bench-tested surplus units are supplied as maintenance spares for metallurgical rolling mills, thermal power main generator DC excitation drives, paper industry multi-section DC drive systems and wind farm step-up converter retrofits.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Full OEM Article Code | 3ADT314900R1002 |
| DDCS Optical Baud Rate | 10 Mbaud high-speed deterministic fiber communication |
| Supported External Fieldbus Protocols | PROFIBUS-DP, Modbus RTU, RS232 point-to-point serial |
| Optical Fiber Interface | Dual-channel optical transmit/receive for DDCS drivebus |
| Serial Signal Compatibility | RS485 multi-drop, RS232 point-to-point, isolated 24V signal level |
| Logic Power Supply | 24 VDC internal power derived from SDCS-CON-4 control board backplane |
| Diagnostic Indicators | Multi-color front LEDs: RUN, DDCS Link Fault, Fieldbus Communication Fault |
| PCB Protection Coating | ISA 71.04 G3 conformal coating for high-humidity industrial environments |
| Mechanical Installation | Internal plug-in slot on SDCS-CON-4 main control board of power drawer |
| Continuous Operating Ambient Temp | -20 °C ~ +50 °C inside drive cabinet; storage temperature -40 °C ~ +70 °C |
| Humidity Class | ≤75% RH non-condensing, indoor control room rated |
| Overall Dimensions | 160 mm L × 102 mm W × 22 mm D |
| Net Weight | Approx. 210 g |
| Compliance Standards | IEC 61800-3 EMC for variable speed drives, PROFIBUS standard IEC 61158, CE & RoHS certified |
Product Introduction
The (3ADT314900R1002) is the dedicated extended communication subboard for ABB DC drives, serving as the signal bridge between the drive internal power stage and external auto
mation control systems.
Three Core Functional Modules
- High-Speed DDCS Optical Drivebus InterfaceThe dual optical fiber ports transmit real-time torque control commands from SDCS-CON-4 to power stage rectifier/inverter modules, and simultaneously feed back CT current, power module temperature and DC bus voltage signals from RVAR / RINT power boards. Optical transmission eliminates high-voltage arc and switching EMI interference, ensuring microsecond-level synchronous control accuracy for multi-drive production lines such as steel rolling mills and paper calender machines.
- Multi-Protocol Fieldbus Gateway ConversionIt integrates universal serial transceivers to convert native DDCS drive data into standard industrial fieldbus signals. Plant DCS (AC800M/800xA) can read motor speed, torque, fault codes and setpoint parameters via PROFIBUS or Modbus without modifying drive control logic. It also supports direct connection to DriveWindow PC commissioning tools through RS232 serial ports for offline parameter upload/download and fault diagnosis.
- Continuous Communication Self-DiagnosisThe front panel LED set independently monitors DDCS fiber link status and external fieldbus signal quality. If fiber cable breakage, bus short-circuit or slave communication loss occurs, corresponding fault LEDs activate and store diagnostic fault codes in the drive’s memory for rapid maintenance troubleshooting.
The full conformal coating treatment prevents PCB oxidation and signal drift in high-humidity metallurgical and paper workshop environments. It must be plugged into the dedicated communication slot of main control board; without a functional , the drive cannot exchange data with upper-layer DCS/PLC systems, and multi-drive synchronous coordinated control functions will be completely disabled.
QA & Testing SOP (Transparency Building)
- Incoming Visual Inspection: Cross-check full part number 3ADT314900R1002 and serial number against ABB drive spare parts database to reject counterfeit mismatched boards; inspect optical fiber transceivers, serial terminal blocks, front LED indicators and conformal PCB coating for burn marks, fiber port cracking or discoloration; record serial numbers and production batches for full traceability.
- Full Linkage Bench Communication Test: Insert into standard control unit, supply internal 24VDC logic power, connect optical fiber to simulated power stage and PROFIBUS master controller; run 24-hour cyclic testing including 10 Mbaud DDCS fiber signal transmission, Modbus/PROFIBUS fieldbus data exchange, fault cable simulation to verify link loss alarm trigger, confirm stable synchronous speed regulation without communication jitter.
- Electrical Insulation Test: Use insulation resistance tester to confirm isolation resistance ≥ 10 MΩ between optical communication circuits, serial fieldbus circuits and internal 24V logic power; test chassis ground continuity resistance below 0.5 Ω.
- Parameter Record Backup: Photograph front LED status definitions and rear plug connector pinout sequences for field wiring and commissioning reference.
- Final QC Packaging: Wipe PCB surface with anti-static microfiber cloth, cover all optical fiber ports and serial terminal blocks with insulating dust caps, place the board into independent ESD shielding bag, attach unified printed QC test tag with technician ID and full 24-hour cyclic communication test runtime timestamp, then pack into foam shockproof carton for long-distance power plant transportation.
Installation Pitfalls & 4-Step Replacement Guide
Common Installation Hazards
❗ DC Bus Residual High Voltage Risk: After cutting off main AC input power, wait minimum 15 minutes for full discharge of DC bus capacitors before opening the power drawer and removing unit to avoid electric shock.❗ Fiber Port Damage Risk: Do not touch optical fiber transceiver core with bare fingers; oil contamination will attenuate optical signals and cause persistent DDCS communication dropout.❗ Fieldbus Wiring Polarity Reversal: Incorrect positive/negative wiring of RS485 PROFIBUS/Modbus terminals will instantly disable fieldbus data transmission.❗ ESD PCB Damage Risk: Wear certified anti-static wrist strap during all disassembly and installation work; bare hand contact with internal communication chips permanently damages DDCS and fieldbus signal processing circuits.❗ Slot Misalignment Installation: Forced insertion of into non-communication slots on will break backplane contact pins and disable the entire drive control unit.
4-Step Communication Board Replacement Guide
- Pre-install Preparation: Perform full lockout/tagout on three-phase AC main power supply, wait 15+ minutes for DC bus capacitor complete discharge, wear ESD wrist strap, photograph DDCS fiber jumper wiring, serial fieldbus terminal wiring and plug-in slot position of inside the control unit.
- Removal Operation: Unplug all optical fiber and serial communication terminal wires one by one following photographed records, unlatch the drawer lock, pull out the old board from the dedicated communication slot.
- Installation & Wiring: Insert the new 3ADT314900R1002 board fully into the designated slot on until the connector clicks locked; re-plug all optical fiber and serial fieldbus cables strictly matching photographed wiring sequence, ensure fiber connectors are fully seated without loose optical coupling.
- Power-on Commissioning Test: Restore drive auxiliary control power, observe front green RUN LED steady on; input nominal motor signal to run no-load drive test, verify stable DDCS fiber communication without link fault alarms, simulate fieldbus data read/write to confirm seamless parameter exchange between drive and DCS/SCADA system.
FAQ
Q: What is the difference between and basic SDCS-COM-8?SDCS-COM-8 is the standard low-speed optical communication board without multi-protocol fieldbus conversion, only supporting simple DDCS drivebus communication for open-loop single-drive applications. upgrades to 10 Mbaud high-speed fiber hardware and integrates multi-protocol serial transceivers, supporting PROFIBUS/Modbus external DCS interconnection and multi-drive high-precision synchronous coordinated control, mandatory for complex rolling mill and paper machine production lines.
Q: Can be hot-swapped with the drive energized?Strictly prohibited. The board connects to live internal 24V logic power and high-speed DDCS optical communication circuits; disassembly under energized conditions will trigger immediate drive trip and permanent damage to optical transceiver chips. Full main power lockout and capacitor discharge are mandatory before replacement.
Q: What warranty applies to stocked 3ADT314900R1002 boards?Factory-new original PCBs carry 12-month official ABB manufacturer warranty covering optical DDCS communication circuits, multi-protocol fieldbus transceivers, signal processing chips and PCB substrate. Bench-tested surplus boards provide 6-month functional warranty; damage caused by DC bus residual voltage shock, fiber port contamination, serial power polarity reversal or ungrounded ESD handling voids all warranty terms.
Q: Has ABB discontinued production?Yes, the entire DC drive platform including communication board is fully end-of-production. New industrial DC drive projects adopt DCS880 series DC converters with integrated communication hardware; is only supplied as maintenance spare parts for legacy drive fleets.
Q: What typical faults indicate a defective board?Common failure symptoms: Persistent DDCS fiber link fault LED alarms without fiber cable damage, complete loss of PROFIBUS/Modbus data exchange with DCS, failure to execute multi-drive synchronous speed control, unstable fluctuating motor speed feedback signals, DriveWindow PC unable to establish serial communication with the drive, and random drive tripping triggered by intermittent communication signal loss.
