Description
1. Product Overview
ABB SDCS-CON-1, part number 3BSE006196R1, is a dedicated core main control board for the DCS500 series DC drives. Serving as the core for logic operation and pulse control of DC drive systems, it is fully compatible with all standard thyristor DC speed controllers of the DCS500 range. It undertakes all core functions including closed-loop calculation of motor speed/torque, generation of thyristor firing pulses, I/O signal acquisition, HMI panel interaction, excitation communication and full-system fault diagnosis.
Equipped with a dedicated ASIC and large-capacity Flash memory unit, the board embeds dual closed-loop PI control algorithms for DC motors and supports multiple standard application firmware for various industries. It integrates two independent isolated RS485 serial ports, multi-channel analog/digital signal acquisition circuits and a 7-segment digital display window. It can be externally connected to CDP310 operator panels and excitation units, and supports Modbus and DDCS industrial communication protocols for connection to DCS and upper monitoring systems.
Adopting full-channel electrical isolation, wide-temperature industrial components and a structure free of mechanical wear parts, the product holds multiple industrial certifications including CE, UL, TUV and ABS marine certification. It is widely applied in renovation projects of DC drives for metallurgical rolling mills, paper rewinders, port cranes, mine hoists, large fans and water pumps, replacement of main control boards on legacy DCS500 speed controllers, and upgrading projects of high-precision tension closed-loop control.
2. Hardware Structure and Composition
2.1 ASIC Core Operation & Pulse Generation Unit
A custom dedicated ASIC chip is built-in, integrating AD/DA conversion, speed PI closed-loop calculation, thyristor firing pulse timing generation and hardware watchdog monitoring functions. It independently completes real-time sampling and calculation of armature current, excitation current and motor speed, and outputs precise phase-shift firing pulses to control power thyristors without occupying external communication resources. A hardware watchdog is embedded to automatically trigger system shutdown protection upon program abnormality and prevent motor runaway.
2.2 Dual-Channel Isolated RS485 Communication Unit
Two independent electrically isolated RS485 serial bus interfaces are provided:
- Terminal X16 for communication interaction with external excitation units;
- Parallel terminals X33/X34 for connection to the local CDP310 operator panel.Surge absorption and current limiting protection are built into the bus to isolate field ground potential interference. It supports panel parameter read/write, fault code upload and remote parameter tuning via upper systems, and adopts the standard Modbus RTU protocol for cross-system data exchange.
2.3 Signal Acquisition & Isolated I/O Loop Unit
Multiple isolated analog setpoint/feedback and digital discrete input/output channels are integrated, which can access 24V field limit contacts, 0~10V / 4~20mA speed setpoints and motor tachometer encoder signals. Transient absorption protection components are fitted on each signal loop to absorb reverse electromotive force from inductive loads such as coils and avoid breakdown of sampling circuits. Independent loop hardware diagnosis is available to identify wire breakage, signal short-circuit and load loss anomalies.
2.4 Storage & Fault Recording Unit
Three independent Flash program memory chips are installed to permanently store system underlying firmware, industry application parameters and motor tuning curves. Matched with large-capacity static RAM and a 1F backup energy storage capacitor, fault alarms, operating hours and fault sequence curves are automatically cached. Data can be retained for a minimum of 8 hours after power loss, and the capacitor requires 30 minutes for full charging. All fault records can be completely read and traced via commissioning software.
2.5 Front Panel Status Display & Global Diagnosis Indication Unit
A 7-segment digital display screen is mounted on the front of the board to show real-time speed controller operating status, fault codes and actual speed values. Multiple groups of two-color LED indicators are arranged corresponding to power supply PWR, bus communication COM, hardware fault FAULT and pulse output RUN respectively.
- Steady FAULT light: Board hardware damage, bus disconnection or program crash
- Flashing COM light: Normal data transceiving of serial portsFault codes can be directly read rapidly from the digital display.
2.6 Isolated Power Supply & Multi-Stage Hardware Protection Unit
Power is supplied uniformly by the internal 24VDC auxiliary power supply of the speed controller, with built-in multi-stage power filtering, reverse polarity, short-circuit and electrostatic surge protection circuits. The operation loop, communication bus and external I/O are 1500VDC electrically isolated from one another. Short-circuit of a single channel will only block signals of the corresponding channel without interrupting core closed-loop control calculation of the motor to ensure safe equipment shutdown.
2.7 Standardized Drive Built-In Modular Housing Unit
Flame-retardant V0 grade high-temperature resistant PCB substrate with reinforced component welding process, featuring standard single-slot board dimensions for DCS500 to be directly clipped into internal slots of DC speed controllers. Gold-plated backplane contact pins resist oxidation and corrosion. Free of moving mechanical parts, it requires zero routine wear maintenance and adapts to long-term constant-temperature and continuous vibration operation inside speed controller cabinets.
3. Technical Specifications
(1) Core Control Performance Specifications
Model & Part No.: SDCS-CON-1 / 3BSE006196R1
Compatible Speed Controller Series: Full range of ABB DCS500 thyristor DC drives
Core Control Chip: Dedicated ASIC integrated circuit
Control Algorithm: Speed / current dual closed-loop PI regulation
Pulse Output Function: Real-time generation of thyristor phase-shift firing pulses
Communication Interfaces: 2 isolated RS485 serial ports
Supported Protocols: Modbus RTU, DDCS, panel dedicated communication protocol
Storage Configuration: Flash firmware storage, RAM fault cache, 1F backup energy storage capacitor
Fault Data Retention: Minimum 8 hours after power loss; charging time: 30 minutes
Diagnosis Capabilities: Online real-time detection of wire breakage, signal short-circuit, power supply abnormality, program fault and motor overload
(2) Overall Electrical Specifications
Rated Supply Voltage: 24VDC (allowable range: 18~30VDC)
Typical Overall Operating Current: 140mA @ 24VDC
Maximum Overall Power Consumption: ≤3.8W
Channel Withstand Isolation Voltage: 1500VDC electrical isolation between I/O, communication and main control loops
Matching Operator Panel: CDP310 HMI operator panel
Hot Swap Support: Hot swapping of boards is not supported
Matching Commissioning Software: ABB DriveWindow, DCS Tools
(3) Environmental Protection Specifications
Operating Temperature of the Whole Unit: -20℃ ~ +60℃
Storage & Transportation Temperature: -40℃ ~ +85℃
Relative Humidity: 5%~95% RH, non-condensing, free of acid and alkali corrosive gas
Protection Class: IP20 (only for installation inside sealed speed controller cabinets)
Pollution Degree: Class 2
EMC Compliance: IEC 61000-4 series industrial Class A high anti-interference standard
Vibration Standard: IEC 60068-2-6, suitable for continuous vibration working conditions of rolling mills and lifting equipment
Maximum Operating Altitude: ≤2000m
(4) Mechanical Installation Specifications
Mounting Method: Vertical plug-in installation in standard internal slots of DCS500 speed controllers
Overall Dimensions: W250mm × H180mm × T30mm
Net Weight: Approx. 0.3kg
Substrate Material: High-temperature resistant flame-retardant PCB, gold-plated backplane contact pins
4. Product Functions and Features
Dedicated ASIC dual closed-loop DC control for high-precision closed-loop speed regulation of DC motors
The built-in dedicated integrated circuit independently completes dual closed-loop calculation of speed and armature current without extra operation units, enabling high-precision steady-state speed and tension control. It is suitable for high-precision process scenarios such as multi-motor synchronization in steel rolling and paper making, and anti-slipping hook control for lifting equipment, featuring fast dynamic response and zero torque ripple at low speed.
Dual independent RS485 serial ports supporting panel operation and excitation / upper communication simultaneously
The two fully isolated serial ports operate without mutual interference. One port is permanently connected to the excitation unit for coordinated regulation of excitation current, while the other links to the local operator panel or upper DCS system, supporting remote parameter modification, fault upload and real-time collection of operating data to simplify communication wiring inside cabinets.
Long-term fault data storage after power loss for complete fault sequence traceability
Equipped with a large-capacity backup energy storage capacitor, fault records and operating parameters can be retained for a long time after power cut without external backup power supply. Maintenance personnel can retrieve speed, current and firing angle curves at the moment of fault occurrence to quickly distinguish hardware faults, line faults and process overload issues, greatly shortening downtime maintenance duration.
Full-channel hardware isolation architecture thoroughly eliminates strong interference from high-power DC drives
1500VDC electrical isolation is adopted between communication, I/O and main control loops, completely isolating harmonic waves from thyristor power loops, cabinet ground potential differences and reverse electromotive force interference from motors. It eliminates setpoint signal drift, speed oscillation and random communication disconnection, applicable to high electromagnetic interference field sites of high-power DC drives in metallurgy and mines.
Standardized DCS500 slot design facilitates replacement during renovation of legacy speed controllers
Unified board dimensions, backplane plug-in interfaces and power supply definitions allow direct in-situ replacement of aging and damaged SDCS-CON-1 main control boards without modifying the power loop of the speed controller or external field wiring. Production can be restored merely by re-downloading motor parameters and process configurations with short equipment shutdown renovation time.
![]()
