1. Product Overview

2. Key Hardware Features

• Board Type: Standard Mark V cabinet DC Power Feedback Board, integrating power supply, signal conditioning, driving and monitoring, compatible with standard control slots and SDCC/LDCC main control board communication.

• Power Input: 38~115VAC (supplied by control power transformer), provides control‑level DC power, motor field power and enclosure fan power; equipped with 3 built‑in fuses for overcurrent/overvoltage/surge protection, with LED/neon lamp fuse status indication.

• Core Circuits: Control‑level power circuit, motor field power circuit, armature voltage/current monitoring circuit, field current monitoring circuit, SCR thyristor drive circuit, AC/DC signal conditioning and isolation circuit.

• Interface Configuration: 1 BNC coaxial main feedback connector (75Ω, for RG58 cable, high‑precision speed/voltage feedback), multiple plug‑in terminals (auxiliary signals/power/drive), 18 plug‑in connectors + 9 pin‑type connectors, 12 configuration jumpers (JP1‑JP12), 7 DIP switches (SW1‑SW7) (for feedback range, voltage attenuation, communication address, filter parameter setup), 5 test points (for voltage/current calibration and fault diagnosis).

• Signal Processing: High‑precision instrumentation amplifiers, low‑pass filtering, electrical isolation; collects armature voltage, armature current, field current, tachogenerator (TG) and other analog feedback signals, conditions to 0~5VDC standard signals, converts to frequency signals via voltage‑controlled oscillator (VCO) for main control upload; voltage acquisition accuracy ≤±0.1%FS, current ≤±0.2%FS, suppresses 50/60Hz power frequency interference.

• Electrical & Environmental: Operating temperature -20°C~+70°C, storage temperature -40°C~+85°C; industrial conformal coating on PCB, anti‑vibration, corrosion‑resistant and EMI‑resistant; dimensions approx. 170mm×100mm×30mm, weight approx. 0.25kg.

• Diagnosis & Maintenance: Status indicators, fuse indication, test points, jumper/DIP configuration, support channel‑level fault location, online calibration and quick replacement, suitable for power plant/industrial site operation and maintenance.

3. Core Functions

1. Multi‑channel Power Supply: Outputs control‑level DC power, motor field power and enclosure fan power, providing stable and isolated power for Mark V drive/excitation subsystems to ensure reliable loop operation.

2. DC Feedback Signal Acquisition & Conditioning: Collects key feedback signals such as armature voltage, armature current, field current and speed (TG/resolver) in real time, performs isolation, filtering, amplification and range conversion, outputs standard 0~5VDC analog signals for main control system closed‑loop control.

3. SCR Drive Control: Outputs thyristor (SCR) drive signals to control power devices in excitation/armature loops, realizing precise voltage regulation, speed regulation and excitation adjustment for DC motors/excitation systems.

4. AC/DC Status Monitoring & Protection: Monitors input AC and output DC voltage/current in real time; triggers protection upon overvoltage, overcurrent, undervoltage or signal loss, locks fault status, outputs alarm/shutdown signals to prevent equipment damage.

5. Flexible Configuration & Communication: Configures feedback range, voltage attenuation, filter parameters and communication address via jumpers and DIP switches; communicates with SDCC/LDCC main control board, uploads feedback data and receives control commands to realize system closed‑loop control.

4. Applications

• Power Industry: Mark V control systems for gas/steam turbines, EX2000 excitation systems, DC2000/AC2000 DC drive systems, used for generator excitation, motor speed regulation, power feedback, safety protection, spare parts replacement, system overhaul and upgrade.

• Industrial Sector: DC motor speed regulation, rolling mills, hoists, conveyors, mixing equipment drive control and feedback monitoring in metallurgy, mining, paper, chemical and other industries.

• Scenarios: Fault replacement of Mark V DC power feedback boards, retrofitting of excitation/drive systems for old units, control system maintenance, spare parts inventory.